fuel pressure question
Thread Starter
Intermediate
Joined: May 2008
Posts: 38
Likes: 0
From: Des Moines Iowa
fuel pressure question
I just replaced the fuel pressure regulator on my 93. When I turn the key to start it my fuel pressure goes to 41psi but when it fires up it drops to 34psi. It stays @ 34 until I shut the car down then it goes back up quickly & holds @ 41. Is that normal if so why does it do that?
I replaced it because before it would only go up to 34 then drop to 19 like a rock.
I replaced it because before it would only go up to 34 then drop to 19 like a rock.
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Sounds normal... My 96 LT1 holds at 40ish until startup where it idles at 34ish... You sound right on the money...
The reason it jumps up to 41 right after you stop it is because the fuel pump takes a fraction of a second to shut and your regulator lost vacuum (because the engine is turning off) so it builds a few psi... Not a big deal
The reason it jumps up to 41 right after you stop it is because the fuel pump takes a fraction of a second to shut and your regulator lost vacuum (because the engine is turning off) so it builds a few psi... Not a big deal
