Huge increase in fuel PSI! is that a problem??

-
myasylum

myasylum

Well-Known Member
Joined
Sep 18, 2008
Messages
1,740
Reaction score
4
Location
Las Vegas, NV
I installed my new tank, 3/8" sending unit, fuel pump, and bigger 3/8" fuel line.

I have now incressed the PSI from what was 7 - 7 1/2, to 9 - 10 PSI!
I was told to keep it at no more the 7 1/2, so the fuel pump I purchused for that PSI for that reason (Carter). Well now I'm pushing 10 PSI. Is that going to be bad?

I was driving it awhile ago and everything seemed fine. It ran real good (better then before really).

If this is dangerous, should I put the stock fuel pump back on... that was the one at 7 1/2 PSI.

Thanks!
 
At those pressures you will most likely overpower the needle/seat in the carb and cause flooding. Unless you're racing even 7 is more than enough. You may want to look into installing a regulator.
 
Does a regular go on before or after the fuel pump?

As long as it seems to not be flooding, should it be ok?
 
A regulator would go between the pump and carb.

Don't waste your time with the cheap parts store (Spectre) "dial" type regs. They're way off.

The Holley style will get you where you need to be.

I would still consider a regulator even if you think it seems to be okay. Don't know what carb you're running. For Holley's, 4-7 psi will do it. Anything over 8 is pushing it.
 
Couldn't I just use a different fuel pump? Or is there a greater reason to go the fuel regulator way? Cheaper perhaps?

I have a Holly Street Avenger 770.

Thanks!
 
Get the regulator and a guage,run the recommended PSI its recommended for a reason
 
is that the regulator is going to help keep you at the selected/set lower PSI all the time, while changing pumps could leave you with a lower PSI, but vary with engine RPM/conditions (perhaps lower than intended).

I vote regulator.
 
Yup go with the regulator. they "flatten out" fuel pressure spikes and lulls as well as keep the pressure at a specified maximum. The general idea is to run higher pressure behind the regulator. It will also help to run a return line. But if you're pitchin a fit about the regulator, I won't even go into a return line. I mean you got several different people on here tellin you what's best.....after YOU asked and you wanna argue with um. "Well, caint I do this, caint I do that?" Damndest thing I ever saw. Yeah, you can do anything you want, but it might not work right. Plumbing a regulator is the correct way to fix this. Get a regulator, go at the job carefully and slowly. You got friends here if you get snagged. Hell, you might even learn sumthin.
 
You must log in or register to reply here.
-

Back
Top