Fuel pressure drop after prime
Fuel pressure drop after prime I've had this since I installed my dual walbros 2 years ago. If I prime, it goes to 55psi (used to go to 60psi) than drops quickly to 20 than bleeds off to 0 rather quickly.
Normal, not normal?
UPDATE' PROBLEM FIXED, two hose clamps where loose. No more quick drop in fuel pressure.
Normal, not normal?
UPDATE' PROBLEM FIXED, two hose clamps where loose. No more quick drop in fuel pressure.
Last edited by maxgee; Jun 2, 2011 at 09:18 PM.
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Joined: Apr 2009
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From: florida
Running or not running pressure? are you saying that it doesnt hold pressure after shutting off, or doesnt hold pressure while running? either way, after two years there might be a split in one of the lines from the walbros, or one of the check valves on one of the pumps is bad?
Figures I'd just pull the pump out before the Heat game and guess what I see thru the bottom of the assembly, a moth!! 
You think this could drop pressure by 5psi?
I'll put it back in tomorrow. Question do u think I should cut a larger hole so the filters can lay out?
You think this could drop pressure by 5psi?
I'll put it back in tomorrow. Question do u think I should cut a larger hole so the filters can lay out?
Last edited by maxgee; Jun 1, 2011 at 10:14 AM.
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Verdad Gallardo FIXED THE PROBLEM!!!!
2 of the hose clamps on the on each pump was loose. Tightened them up, put pump back in and Voila, turn key to on, pressure is at 50psi, holds for couple secs and drops slowly down to Zero.
I'm stoked cuz looks like this should be the issue IO was having when increasing boost to 11psi and AFR creeping up under boost on my last dyno session.
2 of the hose clamps on the on each pump was loose. Tightened them up, put pump back in and Voila, turn key to on, pressure is at 50psi, holds for couple secs and drops slowly down to Zero.
I'm stoked cuz looks like this should be the issue IO was having when increasing boost to 11psi and AFR creeping up under boost on my last dyno session.
