Drone358

Im trying to figure the wiring and the fuel lines to regulate the psi to 6-8psi using the original fuel pump in the car going to a Carbed engine. Curious if anyone has messed with the similar situation. Im just confused with the fueses and the relays. Powering the pump and all.. please help! Thanks guys!

Barlow8869

iTrader: (1)

the oil pressure switch is part of the system, make sure that is hooked up ... i know everyone says you need a regulator, but when i did my tbi to carb swap i just used a filter with a 2nd outlet and routed it to the return line ... never had a problem with it

2012sergen11

iTrader: (1)

You may be able to get away without a regulator if your car was a tbi because of the relatively low pressure but the tpi fuel pump puts out a much higher pressure and will not work without the regulator and return

Drone358

How does the wiring get included in the system? I know it needs to be I just don't understand it trying to map it out in my mind. I've got a schematic of what I need though.
*And about that fuel pump, I know the TBI fuel pumps run about 12psi - straight from the pump- so I figured I would send it down to about 6-8psi. Not sure if its bad for it to be a little high? Who knows, but i'm just going off of old hot rod notes from back in the day haha.

bigal55

iTrader: (1)

Look at this diagram. You need to jump the orange wire to the tan/wht wire at the fuel pump relay. This will run your pump whenever your key is in the run or start positions. As far as the fuel pressure regulator, use one. You don't want over 6 psi going to the carb as the needle and seat is not designed for that high of a pressure. You may get away with it for a while but as the needle and seat wear, you will start pushing fuel past and flood/wash down your engine.

Pocket

iTrader: (24)

^ Thats great if you want to test the pump function or drain the tank. It is NOT useful for continued use ie driving

Lets keep it simple. The relay is computer controlled and since the computer is removed, just replicate what the computer would do to command the relay. In this case, add 12v IGN to the DK GRN/WHT wire and you're done

bigal55

iTrader: (1)

Yep, your right. I saw the hot in run and start and figured that was ignition but didn't give the bulb test a thought. oooops!

Drone358

Wow, awesome man Thanks a bunch! You're a beast at this **** lol

Drone358

Ok great thanks for the info man.. much appreciated

Iroc obsession

my relay has no green/white wire please HELP!! 89 iroc 5.7 tpi converted to carb and ECM removed. Sorry for hijacking thread btw

Pocket

iTrader: (24)

No dk grn/wht wire? Then its not the FP relay