fuel pressure question
Thread Starter
Pro
Joined: Feb 2006
Posts: 501
Likes: 0
From: Vancouver WA
fuel pressure question
just to test fuel pressure and to see a leak, i hooked up the gauge and turned key to on, let it prime, then off. gauge held at about 42-44.. how long should it hold this? thanks
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
ideal would be forever, but none do...slow bleed as soon as key is turned off, hold MINIMUM of 10 psi after 12 hour sit w/ key off, will run great / normal... if it drops to '0' in just a few minutes = bad.
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
Do you mean you are now reading 8 PSI less than you were before, or you lose 8 PSI rapidly when performing a leakdown test? Also, are you reading at the rail or on the FPR?
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
If you replaced the OEM regulator with an aftermarket adjustable FPR, then it sounds like it needs adjusting...not a big deal. It's it's not an adjustable FPR, then it's likely bad. Check for raw fuel in the vacuum line that connects to the FPR. Should be none. If there is any, the FPR is bad.
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Thread Starter
Pro
Joined: Feb 2006
Posts: 501
Likes: 0
From: Vancouver WA
new one is clean in the vacuum line. thats why i replaced it, the old was leaking and causing long starts. this one just took my fuel pressure im assuming. going to get another and see what gives.