Need to drop my fuel pressure, or maybe I'm reading it wrong?

[Dasfinc]

Installed a B+M FPR, and a Walbro 255lph pump on my LS powered 92EG.

Installed a cheap/generic fuel pressure gauge, and with the car running, *vac hose off or on* its always over 100PSI, which I know is not good...
The second I turn the car off, it drops down to like 55 or so.
Am I setting the FPR wrong? Do I need to drill it out like I've seen done to help drop the pressure? Help?


*no matter WHERE I adjust the FPR to, with the hose on OR off, its still above 100*


Could the gauge be bad?

Click to read more...

 

[Ron Vogel]

Are you positive this is the correct FPR; carbed cars require 4-5psi of FP and many regulators require a spring kit for fuel injected cars.

Beware of pressures higher than 125psi, you can burst the injector body.

Also are you positive that you have it plumbed correctly.

 

[Dasfinc]

Are you positive this is the correct FPR; carbed cars require 4-5psi of FP and many regulators require a spring kit for fuel injected cars.

Beware of pressures higher than 125psi, you can burst the injector body.

Also are you positive that you have it plumbed correctly.

the FPR I have is a 'fuel modifier' (uses the stock FPR body with a new spring and an adjustable piston to compress it) a replacement FPR (such as an AEM that replaces the stock unit) that's adjustable is north of $200, so a bit outside of budget.

Its a B+M unit, and is installed I'd imagine correctly (followed the instructions, and its for my make/model of motor)

Plumbing hasn't changed.

 

[Bob Kazamakis]

whats the issue with the stock fpr?

 

[Dasfinc]

whats the issue with the stock fpr?

Stock FPR wasn't adjustable, and was designed to handle like 120lph or something of that nature. If I strapped the Walbro into the car with the stock regulator it would have not been happy.

 

[Bob Kazamakis]

ah i see.

 

[Bob Kazamakis]

when you adjust the FPR does it actually adjust or does it stay at the same pressure?

 

[Dasfinc]

when you adjust the FPR does it actually adjust or does it stay at the same pressure?

Same pressure, I think the regulator is pegged, I found this:

http://www.theoldone.com/articles/regulator/

Honda's with 255's don't play nice, so I need to drill a relief hole.

 

[Bob Kazamakis]

sounds like the solution!

 

[Dasfinc]

sounds like the solution!

Makes sense with a pump with as much output as this one.

 

[Bob Kazamakis]

yep. did you just stick the walbro into your stock pump housing or did it include a new pickup?

 

[Dasfinc]

yep. did you just stick the walbro into your stock pump housing or did it include a new pickup?

came with a new pickup basically.

There is a little cradle that it sits in, and a little 'pickup sock' that attaches to the bottom of the pump to filter the gas.

Loud as shit with no rear interior, Lol.

 

[Bob Kazamakis]

yours has the access panel right in the middle of the car too right? i could see that being VERY loud.

 

[TURBOC1]

I would stick the old fuel pump back in and see what that runs at. if it is still high then the gauge is bad or you did the fpr wrong.

 

[DanJ]

What's done to the car that you need a 255 pump anyways?

 

[Dasfinc]

What's done to the car that you need a 255 pump anyways?

Stocker was going out/didn't have enough output

Car is getting boosted within another month or 2, 450CC injectors and a T3

 

[DanJ]

But is that 255lph pump going to be problematic on a NA setup with stock injectors?

 

[Dasfinc]

But is that 255lph pump going to be problematic on a NA setup with stock injectors?

I have a return-style fuel system, and the regulator is adjustable (or rather should be) so I can drop the line pressure down to stock levels (or again, rather I should be able to)

 

[Bob Kazamakis]

you still havent drilled the hole?

 

[Dasfinc]

you still havent drilled the hole?

I was at a Wake last night for Kims Gpa, We got home at like 11pm.

Today I turn 21, so I plan on being wasted once I get off work.

Sat morning I'm going to take it apart to make sure I installed it right, then I'll drill the hole incase it still is having issues.

Someone mentioned that it should only be at 55-60PSI with a STOCK regulator and a walbro, so something isn't right

 

[Bob Kazamakis]

I was at a Wake last night for Kims Gpa, We got home at like 11pm.

Today I turn 21, so I plan on being wasted once I get off work.

Sat morning I'm going to take it apart to make sure I installed it right, then I'll drill the hole incase it still is having issues.

Someone mentioned that it should only be at 55-60PSI with a STOCK regulator and a walbro, so something isn't right

ah i see. try popping the old one back in. or did you cut it up to add the b&m one in? i understand the walbro flows alot more but i would think with a return system it should be able to regulate fuel pressure with the stock one.

 

[Dasfinc]

the hole for the stock regulator return is TINY, so its a known issue, but not quite to 100PSI, I suspect somethings sticking in the stock regulator.