Guess this racket!
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
Thanks guys I will try that. I was also thinking maybe FPR is weak or leaking internally on the side of the fuel bowl. Truck has 338k who knows if it's original, probably
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
Who sells the spring alone? Tnx
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
This is how it acts with brand new fuel pump installed......
Any serious load and gauge bottoms out at or towards 0
I have fpr rebuild kit in the mail, but this looks like restriction or air out of tank.
Thanks guys
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
By the way, fuel pressure gauge is 0-100, with truck idling just over 40. Initial key contact needle bounces between 40 and 60psi.
Cross-Country
Joined: May 2016
Posts: 66
Likes: 28
From: Southern California
Two checks for problems prior to the pump:
Insert a piece of clear vinyl hose prior to the pump. If you see air bubbles.....
Temporarily T a vacuum gauge into the supply prior to the pump. If you see high vacuum readings (it should be pretty much zero, but I've never run this test on a Super Duty, so I'm not sure what a normal indication would be. A few inches of vacuum is probably OK.), or the reading increases with load, there's restriction in the supply.
Insert a piece of clear vinyl hose prior to the pump. If you see air bubbles.....
Temporarily T a vacuum gauge into the supply prior to the pump. If you see high vacuum readings (it should be pretty much zero, but I've never run this test on a Super Duty, so I'm not sure what a normal indication would be. A few inches of vacuum is probably OK.), or the reading increases with load, there's restriction in the supply.
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Thread Starter
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
Thanks.
I installed billet fpr kit with blue spring, from eBay, got 80psi at idle and cruising. Still drops when wot, not as bad but down to 30, it's issue on the tank side
Clapping noise still there
I installed billet fpr kit with blue spring, from eBay, got 80psi at idle and cruising. Still drops when wot, not as bad but down to 30, it's issue on the tank side
Clapping noise still there
Two checks for problems prior to the pump:
Insert a piece of clear vinyl hose prior to the pump. If you see air bubbles.....
Temporarily T a vacuum gauge into the supply prior to the pump. If you see high vacuum readings (it should be pretty much zero, but I've never run this test on a Super Duty, so I'm not sure what a normal indication would be. A few inches of vacuum is probably OK.), or the reading increases with load, there's restriction in the supply.
Insert a piece of clear vinyl hose prior to the pump. If you see air bubbles.....
Temporarily T a vacuum gauge into the supply prior to the pump. If you see high vacuum readings (it should be pretty much zero, but I've never run this test on a Super Duty, so I'm not sure what a normal indication would be. A few inches of vacuum is probably OK.), or the reading increases with load, there's restriction in the supply.
Thread Starter
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Mountain Pass
Joined: Apr 2012
Posts: 170
Likes: 7
Yes Sir, I will do that and report back. Thank you
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