Did a fuel pressure test today and its running at 41 psi ?
 

about 41 psi, it goes to 48 when you turn the key on then drops back about 5 psi then when running it stays at 41 untill you rap the gas then jumps to like 50. Question is is this about normal or is she getting weak ? :roll:

Are you sure you bled the FP tester enough to ensure there was no air in the tester?

yup why ? I tested the park vave and that was 45 - 47 psi

Many times people don't purge all the air out and the reading will look low. I wanted to double check that before saying that it looked a little lower than the spec.

what should it be for a 98 Bonie and a 99 Park ? Thanks Bill I read a previous post that said 38 psi was normal ?

Hold the presses.

The FP test for my 97 Bonne says to key on over and over as you bleed the air out of the FP tester. Then key on a few more times to achieve the highest pressure. Leave it for 10 minutes and see if it bleeds down.

47-52 is acceptable if I remember correctly.

ok just did a retest; heres the scoop; 1998 Bonnie with 208k miles blead the air turned the key on and off a few times then started it, it stayed at around 42 psi running until you rapped the gas then went to 50 psi. Disconneceted FPR line an ran it and it went to 51 psi.

1999 park Ave with 70k ran at 44 psi roughly then 52 psi with the FPR disconnected, now whcha thinkin' ?

Thanks Bill :roll:

Just got off the phone with BIll and read him your latest test. He said do the test with key on then off WITHOUT starting it and report back.

with key on and bleed the line then off and back on its around 48 psi, is that how he wanted me to do it ?

That sounds like the right process, and IIRC, 48psi sounds about right. Boost will be back on eventually, to verify

Read above. How LONG did it take to bleed down?

6 minutes or a little longer...

Is the test procedure the same for 93 bonneville ssei?

Yes.

But the pressures are NOT the same.

Nope they sure arent...

Series II is 48-55 Psi... Falling a few psi short at dead idle( Vacume applied to the FP reg ) is normal... You could see several Psi lower than the low rating...

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

so is mine ok ? Im at 51 with the vacumn FPR off ?

A little on the lower side... But within range, I'd say for the time being you are ok... What pressure do you have with the Vacume applied and the engine idling?

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

about 42 psi idling with the line conected almost the same as the Park that only has 70k on it.

cvc, with those readings there should be nothing wrong with your pump or regulator for running conditions. If you are having a hard start condition, then we will need to know what the fuel pressure drops to after the pump cycles off. This is refered to as a bleed-down test.

What is your reason for checking the pressure? Whats your complaint?

I just wanted to point out that if, when you pull the vacuum line off the FPR, you see any gas there, replace the FPR regardless of the pressures you test. If gas is there then the FPR's internal diaphram is leaking and letting fuel into the vaccum system.

Does the 93 ssei have the regulator? My numbers are close to 39/40 at idle but drop under accel almost would love to define my issue as pump but buddy re borrowed guages to continue our gto project, I think unless you guys scream I need a new pump?

reason for checking ? Im anal,lol just checking for the heck of it I guess, no hard start starts GREAT !

FPR was replaced under warranty at 175K miles for free at the dealer

Then that makes you the luckiest guy I know!

yea I was having trouble with it spitting gas and i check online and they said there was a Recall so i took it to the buick dealer, sure enough replaced for free !

yes the 93 would have an FPR. reverify your pressures. At idle you should have about 41, disconnect the vacuum line from the fpr it should shoot up to around 50, put the vacuum line back on and it should drop to 41 again. turn off the engine and its should be able to hold near that pressure for several minutes while it bleeds off. The bleed off should be a slow process, if you see the pressure drop right off you have other problems.

Oh, recall. I thought you ment they replaced it under warrenty.