Pontiac Repair: fuel pressure specs, pontiac grand prix, pressure tester

Question
QUESTION: Do you know the fuel pressure spec for a 1999 pontiac grand prix gt 3.8L

ANSWER: Hi
48-55psi
Hope this helps


---------- FOLLOW-UP ----------

QUESTION: sorry about that....i just bought a fuel injection pressure tester and it said that there should be two different pressures......says to check pressure with key in on position but engine off......then says to check pressure when engine is running...

so i asked a lazy question.  My question is at what pressure should it be when the engine is running.....and second....At what pressure should it be when the key is on but the engine is off???  

And by the way, thanks a million, I can't believe I got a response so fast!!!!!

Answer
Hi
No problem
Key on engine running - 48-55 psi.
Key on, enging off (after fuel pump stops running about 10 secs.) should not drop more than 5 psi.
It should then hold that pressure AT LEAST 10 mins. preferabally a overnight.
I Hope this helps.
Follow post anytime
Pawl