AutoX86Z28

its letting to much gas pass through and i dont no how to adjust it to a lower setting. i screw the adjustable screw up and down and it still lets too much fuel in. wut do i do?

EDIT: it overflows my carb with fuel.

AM Racer

As you're adjusting it, what is the fuel pressure reading?

AutoX86Z28

dont have a guage. i was gonna get one from autometer but i didnt see how it would hookup and i didnt have 50 bux. where can i get a cheap one?

any thing else?

AM Racer

Not knowing which pump you're running, How can you arbitrarily guess a fuel pressure adjustment and determine it to be the cause of your carb messing up.
If the carb has problems, nothing that you bolt on the outside of it will fix it.

AutoX86Z28

im not too good with carbs. but when fuel starts coming out of the top of the carb, i thoguht it was getting way too much fuel or pressure. i am running an electric fuel pump that came with the car(my car was FI) b4. now that fuel pump pushes about 25 gph and about 60 psi. so to bring that down i use a regulater. but it is not bringing that pressure down. how do i adjust it? and where can i get a guage?

AM Racer

Ok, so you're using an injection pump.
How do you know if it's working or not, if you can't see the pressure anyhow?
It's like driving in a whiteout. You have no clue where you're at or where you're going, but as long as you're moving it's ok?
Do you have a regulator capable of adjusting that amount of pressure?
Maybe you should have researched a little before jumping in with both feet.
You need a pressure gauge, expensive or not, period.
You need to determine if you messed up the floats by tossing in that much fuel.

KingChris

I saw a deal in pepboys for an Equus pressure guage, timing light, multimeter and a few other things for $50. Good deal or no.

AutoX86Z28

i can hear the pump running from the back of the car. the regulater i have is the mallory regulater 1405. u can adjust the psi from 3- 12. should be wut i need. how do i determine if the floats are messed up?

AutoX86Z28

anybody at all? i still need help

AM Racer

Honestly, I don't think there's anyone that can post an answer until you come up with a valid fuel pressure number.

88IROC350TPI

So you're using a regulator capable of regulating 3-12psi while your pump is capable of 60psi? Doesn't that register? Get a Mallory #4309 regulator or get a different pump.

MrDude_1

what the pump is capable of pushing for PSI has nothing to do with it.

carlover01:


first you NEED NEED NEED a fuel pressure gauge. no way around it. you need one. they're $7 for a cheap cheap spectre one from the chrome isle at your local auto parts store. or splurge and get the good $15 one... or if you're a real cheap guy, goto autozone and rent one for free.

what regulator are you running? it HAS to be a bypass regulator. if you got the standard line in from pump, line to carb one, it wont work. you need the line to pump, return line to tank, 3rd line to carb one.


if you have the right regulator, hook up your gauge. turn the regulator down as low as it'll go, turn the key on, and turn up the pressure until it reads 6-7psi with the motor off.
then if the carb isnt leaking, start the car, and adjust it to 5-6psi with it running. it should be very close, might even be dead on.

if the carb is leaking at 6-7PSI then try tapping the bowls with a soft faced hammer.


get back to us after that.

StealthElephant

http://store.summitracing.com/partde...art=MAA%2D4309

I use that regulator with my stock TPI fuel pump. It holds 6PSI rock steady all day long, just used the stock fuel connections on the driver side.

You can buy a vacuum/fuel pressure combo gauge from pepboys for like 15$. Buy a T fitting, get a piece of vacuum line long enough and hook the guage into you fuel supply line and tape the gauge to your window and watch your fuel pressure as you drive and around idle etc.

88IROC350TPI

Has everything to do with it. I just looked for a "Mallory 1405" regulator and apparently it doesnt exist. If you have a pump made for EFI that pushes a lot of pressure you cant just slap any carb-friendly regulator onto it and think its going to handle turning 60psi of fuel into 6psi. So, if he is running a regulator incapable of doing that, he'd definately have problems with the pressure being too high...

But, to determine that you would definately need a fuel pressure guage.

MrDude_1

sure ya can.... as long as its a carb friendly bypass regulator you can.

if you doubt me, you can goto the carb forum, do a search, and read for yourself.


the extra fuel just goes back to the tank... as long as the pump isnt dead-headding on the regulator, it works just fine.

89 CamaroIROCZ

I think I have the same problem with the mallory. Mine doesn't cause a problem however, i'm reading about 9 psi at the carb and can't get it any lower. After much research I found out it was due to the size of the fuel return line going back to the tank. Since it is such a small size it can only hold so much fuel/pressure at one time keeping me at around 9psi. When I relocate my regulator I am planning on putting some bigger lines on. Maybe that will help?

Matt

Stekman

I personally use an EFI pump with a 4309 regulator and have no issues at all. Like Dude said, you NEED a return style regulator, you cant have the single in-out style. Get the 4309 and a gauge and i think your issues will be solved.

AutoX86Z28

im goin to get a guage right now. so ill test that and go from there. thanks a ton guys. also how should i run my return line? i know the port for the line on the regualter is on the bottom.

this is the regulater i have. sorry a little mess up on the model number. that 140 5 is the number for my carb. lol.

AutoX86Z28

ok guys i got the guage. and my pressure is above 15(the guage only goes up to 15) lol. so i gotta do somethin about that to bring it WAY down. mayb the return line will help

Damon

I have that same regulator and I'm going to be putting it on my 92 RS when I convert from FI (305 TBI motor, originally) over to carb in a week or two. Not my first time doing something similar to this, but my first time using the Mallory regulator.

The return line does come out the bottom/center of the regulator. That gets connected to the stock fuel return line in a manner similar to how your fuel feed line is connected to it now. Your car originally had 2 fuel lines coming off the driver's side strut tower. A larger 3/8" feed line from the pump and a slightly smaller 5/16" return line going back to the tank. The return port on the bottom of the regulator gets connected to the stock 5/16" return line.

The difference between having a properly functioning return line and just dead-heading the pressure against the regulator is night-and-day. I've done stuff like this several times and using a high pressure FI fuel pump feeding a low pressure carburetor absolutely requires running a return-style regulator/lines.

Once you get the return line hooked up and functioning properly your fuel pressure readings at the carb will act much more "sane."

88IROC350TPI

So you're running a RETURN style regulator without a return? Thats pretty much how the regulator controls the pressure.... you NEED one.

br()bert

Did you get it fixed yet? My mallory works flawlessly. I had the motor running for half and hour or so today with no problems at all... Ahhh the sound of a v8 idling with open exhaust... much better then my old 2.8

AutoX86Z28

im workin on it lol. even if it means i pull an all nighter. AND i have finals tomm.:lala: :lala: :lala:

AutoX86Z28

UPDATE!!!!: its fixed. my mistake. darn return line. hooked it up and the guage read 6 psi. i was so happy. i love this site:hail: :hail: :hail: :hail: :hail: