Help please, Can't get fuel pressure down with new pump and regulator.
 

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 ideal...

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?

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

Found this:

Looks like the FPR is just Pegged and can't dump fuel fast enough because of how small it is.

Need to drill it out a spec :)

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

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

get an AEM or Aeromotive FPR.......I threw the B&M in the garbage, it would stick open after about a year.

Also with Larry's mod you need a bigger drill bit, it'll also bleed off the line pressure when you shut the car off. Now you'll need to await 2-3 seconds for the pump to prime before cranking.

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

.035" is too small you are saying?

I have no problem waiting 2-3 seconds to start, Car isn't daily driven, and I will eventually purchase the AEM or Aeromotive units, but they are out of my pricerange right now.

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

I think I went .062" on mine.

start small and work your way up, but 1/16" was the smallest bit I had and it's very easy to break.

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

Thanks for the help!

Do you think this might be my problem? (the pressure just pegging the FPR)

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

your should only be at 55-60 with the vacuum line off with a walbro and stock FPR

Re: Help please, Can't get fuel pressure down with new pump and regulator.
 

Ima have to assume I didn't install it correctly if thats the case.

I know I cut it correctly, so the spring must not be sitting on the piston correctly or something.

Thanks for the info

(I kept the stock spring if it matters?