TPI to CARB fuel pump wiring and harness
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Car: 1991 Camaro Z28
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TPI to CARB fuel pump wiring and harness
Hey everyone i just pulled out my 305 tpi engine and im dropping in a 350 carb'd engine. When i removed the tpi i also removed the engine harness, do i have to have the engine harness to make this car start and run? Also ive been told that since i dont want to drop the tank and replace the fuel pump i could just buy a regulator, which i did. Now ive been told i need something to power the fuel pump relay since i dont have an ECM anymore. What should i do? If i buy an 88 and up TBI harness off a camaro will that solve my engine harness problem? Also will it solve my fuel pump problem? If not help is needed, thanks.
#2
Re: TPI to CARB fuel pump wiring and harness
You need the harness on the fuse block side, the ECM wiring you don't need. If you already have your adjustable regulator installed, it is just a matter of hooking up your stock fuel pump with an independent relay; power, ground, and switched 12-volt source. You can even run an inline fuse if you'd like, whatever you feel comfortable with. Your also going to need a standalone e-fan control, very easy to hook up. Good luck....
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Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: TPI to CARB fuel pump wiring and harness
You need the driver side harness - if you yanked that out then good luck!
Most of the pass side harness can come out, but really - why does everyone insist on cutting wires BEFORE the swap is done? It's really about the dumbest thing to do, once you cut out a wire it's ten times harder to reinatsll it
Fuel pump relay - just add 12v+ to the green wire with white stripe - you want this to be a hot-in-run wire so the pump doesn't run 24/7.
You need a Mallory 4309 fuel pressure regulator to keep the intank pump.
You need to do some research on here - all these questions have been asked and answered at least 10 times a week.
Most of the pass side harness can come out, but really - why does everyone insist on cutting wires BEFORE the swap is done? It's really about the dumbest thing to do, once you cut out a wire it's ten times harder to reinatsll it
Fuel pump relay - just add 12v+ to the green wire with white stripe - you want this to be a hot-in-run wire so the pump doesn't run 24/7.
You need a Mallory 4309 fuel pressure regulator to keep the intank pump.
You need to do some research on here - all these questions have been asked and answered at least 10 times a week.
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OnDaClock (01-23-2024)
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Car: 1991 Camaro Z28
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Transmission: 700r4
Axle/Gears: 2.73 posi drum
Re: TPI to CARB fuel pump wiring and harness
Thanks for the reply. Ive got the drivers side wiring harness understood. What im not understanding is the fuel pump wiring, when you say just add 12v to that green wire with white stripes what do you mean? Yes i have the mallory 4309 regulator, now if someone can help me with this. Is it possible to hook the fuel lines from the regulator up the the stock fuel lines from the car with a fitting? If not what will i need to do? Also what adapters will i need to use in order to get this regulator hooked up? Im new to carb so im starting all over again. All i know is i need three 6AN to 3/8NPT fittings to go into the regulator
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Car: 1991 Camaro Z28
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Re: TPI to CARB fuel pump wiring and harness
Thanks for that. Now all i need help with is the fuel pump relay wiring
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Car: 1992 RS
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Re: TPI to CARB fuel pump wiring and harness
You just connect a 12v+ wire to that green with white stripe wire at the fuel pump relay - that's all - what's so hard about that? You want a hot-in-run wire ... a wire that only gets 12v+ when the key is on ... tap into that and connect to the fuel pump relay green/white stripe wire.
The stock fuel lines can be connected to the carb and fpr via simple brass fittings from any hardware store - in the plumbing section. The fuel lines are metric, and you need hose barbs that are NPT for the regulator - so you get metric to NPT connectors, then run rubber fuel hose to the regualtor, then to the carb.
For the feed line, you need a metric to NPT connector on the stock 3/8 feed line, then a NPT hose barb that is 3/8 hose, then the 3/8 rubber fuel injection hose, then another 3/8 hose barb that is NPT that screws into the Mallory, then another 3/8 hose NPT out of Mallory, another chunk of 3/8 rubber hose, and the banjo fitting on the carb.
Same with the return line, except you need 5/16 hose and hose barb fittings.
All that available at local ACE hardware store, in brass, in the plumbing section.
The stock fuel lines can be connected to the carb and fpr via simple brass fittings from any hardware store - in the plumbing section. The fuel lines are metric, and you need hose barbs that are NPT for the regulator - so you get metric to NPT connectors, then run rubber fuel hose to the regualtor, then to the carb.
For the feed line, you need a metric to NPT connector on the stock 3/8 feed line, then a NPT hose barb that is 3/8 hose, then the 3/8 rubber fuel injection hose, then another 3/8 hose barb that is NPT that screws into the Mallory, then another 3/8 hose NPT out of Mallory, another chunk of 3/8 rubber hose, and the banjo fitting on the carb.
Same with the return line, except you need 5/16 hose and hose barb fittings.
All that available at local ACE hardware store, in brass, in the plumbing section.
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#8
Re: TPI to CARB fuel pump wiring and harness
I've burned up two in tank pumps using the regulator in a carb'ed application. We are currently converting the pickups to remove the intank pump and will be installing either a mechanical pump or a frame mounted Holley.
...probably going to do the Holley, but there is something about doing it old school that appeals to me...
...probably going to do the Holley, but there is something about doing it old school that appeals to me...
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Kenneth McGill (11-11-2020)
#10
Re: TPI to CARB fuel pump wiring and harness
4039 3 port Mallory.
Nothing wrong with the regulator, I just think it puts too much back pressure, even with the 3rd port feeding the return, on the high pressure pump.
Like I say, we're going to junk the intank pump and go with a carb specific pump.
Nothing wrong with the regulator, I just think it puts too much back pressure, even with the 3rd port feeding the return, on the high pressure pump.
Like I say, we're going to junk the intank pump and go with a carb specific pump.
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Car: 1991 Chevy Camaro
Engine: Chevy 305 bored .30 over
Transmission: 700R4
Re: TPI to CARB fuel pump wiring and harness
You need the driver side harness - if you yanked that out then good luck!
Most of the pass side harness can come out, but really - why does everyone insist on cutting wires BEFORE the swap is done? It's really about the dumbest thing to do, once you cut out a wire it's ten times harder to reinatsll it
Fuel pump relay - just add 12v+ to the green wire with white stripe - you want this to be a hot-in-run wire so the pump doesn't run 24/7.
You need a Mallory 4309 fuel pressure regulator to keep the intank pump.
You need to do some research on here - all these questions have been asked and answered at least 10 times a week.
Most of the pass side harness can come out, but really - why does everyone insist on cutting wires BEFORE the swap is done? It's really about the dumbest thing to do, once you cut out a wire it's ten times harder to reinatsll it
Fuel pump relay - just add 12v+ to the green wire with white stripe - you want this to be a hot-in-run wire so the pump doesn't run 24/7.
You need a Mallory 4309 fuel pressure regulator to keep the intank pump.
You need to do some research on here - all these questions have been asked and answered at least 10 times a week.
thanks!
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Car: 1992 RS
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Re: TPI to CARB fuel pump wiring and harness
Really just any wire that gets 12v+ with the key on - just probe a few close to where you want to tie in at to find one that has 12v+ only when key is on.
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Car: 1991 Chevy Camaro
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#16
Re: TPI to CARB fuel pump wiring and harness
You need the driver side harness - if you yanked that out then good luck!
Most of the pass side harness can come out, but really - why does everyone insist on cutting wires BEFORE the swap is done? It's really about the dumbest thing to do, once you cut out a wire it's ten times harder to reinatsll it
Fuel pump relay - just add 12v+ to the green wire with white stripe - you want this to be a hot-in-run wire so the pump doesn't run 24/7.
You need a Mallory 4309 fuel pressure regulator to keep the intank pump.
You need to do some research on here - all these questions have been asked and answered at least 10 times a week.
Most of the pass side harness can come out, but really - why does everyone insist on cutting wires BEFORE the swap is done? It's really about the dumbest thing to do, once you cut out a wire it's ten times harder to reinatsll it
Fuel pump relay - just add 12v+ to the green wire with white stripe - you want this to be a hot-in-run wire so the pump doesn't run 24/7.
You need a Mallory 4309 fuel pressure regulator to keep the intank pump.
You need to do some research on here - all these questions have been asked and answered at least 10 times a week.
#17
Re: TPI to CARB fuel pump wiring and harness
i know that this is an old thread but uh.... i see somebody mentioned the wiper motor 12v source. isn't this "hot in accy and run"? is that a problem? if so i was thinking of running the green fuel pump relay wire to the 25 amp htr-a/c fuse which is only "hot in run".
But I have had no problem so far, but do intend on rewiring the 12v source.
#18
Re: TPI to CARB fuel pump wiring and harness
Being that the engine I have is carbed & out of a 79, it seems that I don't have an oil pressure switch in the block. Only a sending unit by the distributor.
#19
Re: TPI to CARB fuel pump wiring and harness
Disregard the oil pressure switch as a safety that I posted earlier. It only turns the pump on after it sees 4psi of oil pressure. I doesn't cut the 12v to the fuel pump if it looses pressure according to several post on this board . I guess you learn something new every day. lol
I'm sure there is a way to wire up a safety switch, but that may be in a different thread.
Although this seems to say it does.
http://www.jegs.com/i/Holley/510/12-810/10002/-1
Directions on installation.
http://www.jegs.com/InstallationInst...510-12-810.pdf
Last edited by bluegrassz; 06-05-2012 at 02:21 PM.
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Car: 1986 iroc z28
Engine: 350
Transmission: 700-r4
Re: TPI to CARB fuel pump wiring and harness
i realize that this is an old old thread..but were you able to get a gas gauge hooked up with your set up...i also went from tpi to carb..and a mechanical fuel pump...how do i get the gas gauge to work?
#22
Re: TPI to CARB fuel pump wiring and harness
Use the in tank pump & a mallory 4309 fpr to drop the pressure.. search this site for mallory 4309 & you will find a thread with pikz of installation.
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Car: 1986 iroc z28
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Re: TPI to CARB fuel pump wiring and harness
i actually had no idea that you could adjust the pressure of the fuel coming out...lol. that would save me alot of headache! the PO told me that he went with the mechanical fuel pump..because the in tank pump that worked with the old tpi system would constantly flood out my carb. so i didnt know there was that option,,i wonder why the hell he would not have just done that to begin with..lol thanks!
Last edited by napalm368; 06-19-2012 at 04:46 PM. Reason: add sentance
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Car: 86 IROC-Z
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Re: TPI to CARB fuel pump wiring and harness
so run power to the green/white wire and the fuel pump will kick in when needed automaticly?
#25
Re: TPI to CARB fuel pump wiring and harness
Run the green & white wire from the fuel pump relay to a "hot in run" source. I used the heater/ ac fuse under the steering wheel. Any time the key is in the run position the fuel pump will stay on.
#26
Re: TPI to CARB fuel pump wiring and harness
#27
Re: TPI to CARB fuel pump wiring and harness
Use some type of connector to put 12volts power to the green and white wire at the fuel pump relay. I used one like in this video.
http://https://www.youtube.com/watch?v=YBxJmoXdBxk
The red wire would be the green and white and the black wire would be the wire coming from the 12v source. You need to tap into a wire or location that has 12v when the key is turned to the on position. Adding a switch between the 12v source is an extra precaution. That way you can have the key on without the fuel pump running.
#28
Re: TPI to CARB fuel pump wiring and harness
I just converted my 92 camaro from 305 tbi to carbureted it has a 350 in it now.im running the intank pump that's brand new.It seems that when it is at idleing at a dead stop it runs out of gas and pump won't kick on for a minute or two while acasionaly cranking it over.it's got a fuel preasure regulator with return on it.I also noticed that when this problem occurs my oil preasure gauge starts flickering with the pump just a little bit.any ideas?
#29
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: TPI to CARB fuel pump wiring and harness
1) How did you wire it?
2) From your description, it sounds like your engine has low/no oil pressure at idle.
https://www.thirdgen.org/forums/elec...it-wiring.html
If you are wired as in the diagram above, then power to the tank fuel pump gets cut off if your oil pressure drops too low. Look at the fuel pump oil pressure switch.
2) From your description, it sounds like your engine has low/no oil pressure at idle.
https://www.thirdgen.org/forums/elec...it-wiring.html
If you are wired as in the diagram above, then power to the tank fuel pump gets cut off if your oil pressure drops too low. Look at the fuel pump oil pressure switch.
Last edited by NoEmissions84TA; 06-06-2017 at 01:12 AM.
#30
Re: TPI to CARB fuel pump wiring and harness
The motor was in a older truck it had a aftermarket oil gauge it read 40psi while driving and 20psi at idle I plugged the camaro oil preasure sender deal in on it and it and it will read 28psi on cold start and come down to 12psi at idle when the car had the 305 tbi the oil gauge would flicker and would usually bury its self in the red
#32
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: TPI to CARB fuel pump wiring and harness
1) Verify oil pressure with a known good mechanical gauge.
2) I don't know exactly how you are wired. You can jump the FP relay to see if it runs that way. Then investigate from there.
2) I don't know exactly how you are wired. You can jump the FP relay to see if it runs that way. Then investigate from there.
#33
Re: TPI to CARB fuel pump wiring and harness
Use some type of connector to put 12volts power to the green and white wire at the fuel pump relay. I used one like in this video.
http://https://www.youtube.com/watch?v=YBxJmoXdBxk
The red wire would be the green and white and the black wire would be the wire coming from the 12v source. You need to tap into a wire or location that has 12v when the key is turned to the on position. Adding a switch between the 12v source is an extra precaution. That way you can have the key on without the fuel pump running.
http://https://www.youtube.com/watch?v=YBxJmoXdBxk
The red wire would be the green and white and the black wire would be the wire coming from the 12v source. You need to tap into a wire or location that has 12v when the key is turned to the on position. Adding a switch between the 12v source is an extra precaution. That way you can have the key on without the fuel pump running.
#34
Re: TPI to CARB fuel pump wiring and harness
Just to clarify..as I am doing this too. The plug that goes to the fuel pump relay is embedded in the ecu harness. I am removing the ecu harness. Did you just cut the plug off and run power to the green/white wire and tape/solder up the others? Or are these the wires that go back to the pump? I havent pulled the motor yet and havent cut anything off.
#35
Re: TPI to CARB fuel pump wiring and harness
The relay is on the firewall next to the brake booster. The wiring harness going to the ecu through the passenger side fender is a separate harness. I cut the wire going to the relay and run a jumper to the 12v on the wiper motor. Looking back, it would be better to find a 12v source in the fuse box under the dash and not draw off another system. You can also wire in a switch for a theft deterrent.
#36
Re: TPI to CARB fuel pump wiring and harness
Thanks, I assumed this was the case. At first glance the plug/wiring from the fuel pump relay is routed into the same loom at the firewall as the ECU harness. It goes across the back of the engine and into the passenger fender well. It must split off before it gets to the fender well somewhere. I'm going to have to split that loom and sort it out.
I've read just about every thread on thirdgen about TPI to carb swapping and they all say, "get rid of the harness and cut one wire and wire it to a key hot location" but I cant possibly do that when every single wire runs with the ECM harness.
as you can see in this pic, all of my fuel pump relay wiring goes into the ECM harness and gets entangled with the rest of the wires. this is making it impossible for me to remove this harness and still run the fuel pump relay
#37
Re: TPI to CARB fuel pump wiring and harness
Save yourself the time and effort. Hacking apart an otherwise good ECM harness for a relay and a couple wires is, well,.... ruining a good harness for very little benefit; it's worth something intact - not worth much at all once it's hacked-up.
If your going to a carb than just use a block mounted pump,.... or custom wire a relay and aftermarket pump. ( Do the same thing for the electric fan too,.... then the only other thing the ECM harness would be removing would be TCC lock-up and there are aftermarket kits for that too. ) I prefer to remove the in-tank pump when swapping from FI to carb. Would rather use a FPR to keep the carb FP regulated down a few pounds rather than reducing the pressure from the 40lb range down the the 7-8lbs that the carb will want; ( just my opinion. )
If your going to a carb than just use a block mounted pump,.... or custom wire a relay and aftermarket pump. ( Do the same thing for the electric fan too,.... then the only other thing the ECM harness would be removing would be TCC lock-up and there are aftermarket kits for that too. ) I prefer to remove the in-tank pump when swapping from FI to carb. Would rather use a FPR to keep the carb FP regulated down a few pounds rather than reducing the pressure from the 40lb range down the the 7-8lbs that the carb will want; ( just my opinion. )
Last edited by John in RI; 04-02-2018 at 11:16 AM.
#38
Re: TPI to CARB fuel pump wiring and harness
Save yourself the time and effort. Hacking apart an otherwise good ECM harness for a relay and a couple wires is, well,.... ruining a good harness for very little benefit; it's worth something intact - not worth much at all once it's hacked-up.
If your going to a carb than just use a block mounted pump,.... or custom wire a relay and aftermarket pump. I prefer to remove the in-tank pump when swapping from FI to carb. Would rather use a FPR to keep the carb FP regulated down a few pounds rather than reducing the pressure from the 40lb range down the the 7-8lbs that the carb will want; ( just my opinion. )
If your going to a carb than just use a block mounted pump,.... or custom wire a relay and aftermarket pump. I prefer to remove the in-tank pump when swapping from FI to carb. Would rather use a FPR to keep the carb FP regulated down a few pounds rather than reducing the pressure from the 40lb range down the the 7-8lbs that the carb will want; ( just my opinion. )
i was originally gonna do a block mounted pump but the vortec blocks don’t have the provision for one, the engine I put in the car has a vortec block.
I am am interested in doing the custom wiring and relay but have no idea what relay to buy or how to wire it. This would be the ideal method for me.
my other option is to just go with the Holley sniper efi kit and avoid this headache all together.
#39
Re: TPI to CARB fuel pump wiring and harness
As that VSS thread described, you don't need to go into the ECM harness AT ALL for the VSS. Just re-install it's ground and you're G-T-G. (the 2 speedo sending unit wires are inside the ENGINE harness,...... aren't they ?! )
No Block mounted pump - Got it !
You could use the exact same relay your car already uses,... just need a replacement relay and proper plug,... wire it exactly as the factory did. ( same thing for the electric fan )
From an 87 Camaro Shop manual:
P.S. Well - not "Exactly",..... Would need to wire the Green/White wire to an ignition source !
No Block mounted pump - Got it !
You could use the exact same relay your car already uses,... just need a replacement relay and proper plug,... wire it exactly as the factory did. ( same thing for the electric fan )
From an 87 Camaro Shop manual:
P.S. Well - not "Exactly",..... Would need to wire the Green/White wire to an ignition source !
Last edited by John in RI; 04-02-2018 at 11:30 AM. Reason: EDIT: P.S.
#40
Re: TPI to CARB fuel pump wiring and harness
As that VSS thread described, you don't need to go into the ECM harness AT ALL for the VSS. Just re-install it's ground and you're G-T-G. (the 2 speedo sending unit wires are inside the ENGINE harness,...... aren't they ?! )
No Block mounted pump - Got it !
You could use the exact same relay your car already uses,... just need a replacement relay and proper plug,... wire it exactly as the factory did. ( same thing for the electric fan )
From an 87 Camaro Shop manual:
P.S. Well - not "Exactly",..... Would need to wire the Green/White wire to an ignition source !
No Block mounted pump - Got it !
You could use the exact same relay your car already uses,... just need a replacement relay and proper plug,... wire it exactly as the factory did. ( same thing for the electric fan )
From an 87 Camaro Shop manual:
P.S. Well - not "Exactly",..... Would need to wire the Green/White wire to an ignition source !
nope the VSS wires are in the ecm harness on my car, I’m assuming 85-87 were weird years for thirdgen firebirds, I’ll check those schematics when I get home. Thanks.
#41
Re: TPI to CARB fuel pump wiring and harness
Got it ! Looks like they moved them to the C100 in the 87 Firebird. ( PIN 'M' on C207 is still VSS ground. )
In your 86 those 2 VSS wires run into a small 2 or 3 socket plug next to the big C207 connector. But; again,...... we're talkin' about just 2 wires and a plug, about as basic it gets.
In your 86 those 2 VSS wires run into a small 2 or 3 socket plug next to the big C207 connector. But; again,...... we're talkin' about just 2 wires and a plug, about as basic it gets.
#42
Re: TPI to CARB fuel pump wiring and harness
Got it ! Looks like they moved them to the C100 in the 87 Firebird. ( PIN 'M' on C207 is still VSS ground. )
In your 86 those 2 VSS wires run into a small 2 or 3 socket plug next to the big C207 connector. But; again,...... we're talkin' about just 2 wires and a plug, about as basic it gets.
In your 86 those 2 VSS wires run into a small 2 or 3 socket plug next to the big C207 connector. But; again,...... we're talkin' about just 2 wires and a plug, about as basic it gets.
and for the fuel pump relay, I'm wondering why they ran the wiring for that with the ECM harness. I tried following your schematic but I'm not too sharp with electrical.
#43
Re: TPI to CARB fuel pump wiring and harness
Yup.... looks like 2 wires 1 plug and 1 ground for the VSS.
The FPR only has 5 wires
1 ground,
1 full time power
1 IGN power ( to ECM on schematic )
1 TEST ( ALDL )
1 Power to Fuel Pump
As for the Fuel Pump Relay wiring,.... C207 was a good way to get a circuit from 'here-to-there'. Over the years they have used it for lots of stuff that needed to get passed thru the car. ( reverse lights for example. ) Generally, most stuff @ C207 is ECM related - but not always. IIRC the 90-91 cars had a courtesy light running thru it !
The FPR only has 5 wires
1 ground,
1 full time power
1 IGN power ( to ECM on schematic )
1 TEST ( ALDL )
1 Power to Fuel Pump
As for the Fuel Pump Relay wiring,.... C207 was a good way to get a circuit from 'here-to-there'. Over the years they have used it for lots of stuff that needed to get passed thru the car. ( reverse lights for example. ) Generally, most stuff @ C207 is ECM related - but not always. IIRC the 90-91 cars had a courtesy light running thru it !
#44
Re: TPI to CARB fuel pump wiring and harness
Yup.... looks like 2 wires 1 plug and 1 ground for the VSS.
The FPR only has 5 wires
1 ground,
1 full time power
1 IGN power ( to ECM on schematic )
1 TEST ( ALDL )
1 Power to Fuel Pump
As for the Fuel Pump Relay wiring,.... C207 was a good way to get a circuit from 'here-to-there'. Over the years they have used it for lots of stuff that needed to get passed thru the car. ( reverse lights for example. ) Generally, most stuff @ C207 is ECM related - but not always. IIRC the 90-91 cars had a courtesy light running thru it !
The FPR only has 5 wires
1 ground,
1 full time power
1 IGN power ( to ECM on schematic )
1 TEST ( ALDL )
1 Power to Fuel Pump
As for the Fuel Pump Relay wiring,.... C207 was a good way to get a circuit from 'here-to-there'. Over the years they have used it for lots of stuff that needed to get passed thru the car. ( reverse lights for example. ) Generally, most stuff @ C207 is ECM related - but not always. IIRC the 90-91 cars had a courtesy light running thru it !
so in order to make the fuel pump relay work without the ecm I need to run a ground, one wire to constant power (battery), one wire to a switched 12v, one wire to the aldl port, and then a wire to the fuel pump. Correct?
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