fuel pump problems
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fuel pump problems
I have a 92 F150 with a fuel problem. The truck runs fine and has power on the front tank. On the rear tank, I have had problems with lack of power and it didn't want to start when cold. If I switch to the front tank, it starts fine.
Finally the rear tank got to the point it couldn't even keep the truck running at an idle, so I had the rear pump replaced. The truck can now idle and can run down the highway on the rear tank, as long as you only accelerate VERY gently. If I climb a hill, it acts like it's getting no fuel. If I switch suddenly to the front tank, it has power again.
The truck did have the check valve installed sometime in the mid-90's to stop cross flow between the tanks. Do they ever go bad?
Any suggestions as to where I should start looking now?
John
Finally the rear tank got to the point it couldn't even keep the truck running at an idle, so I had the rear pump replaced. The truck can now idle and can run down the highway on the rear tank, as long as you only accelerate VERY gently. If I climb a hill, it acts like it's getting no fuel. If I switch suddenly to the front tank, it has power again.
The truck did have the check valve installed sometime in the mid-90's to stop cross flow between the tanks. Do they ever go bad?
Any suggestions as to where I should start looking now?
John
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Check the voltage at the rear tank, you may have a wiring or ground problem, and to verify check the fuel pressure at the fuel rail. My guess is you are not getting full voltage to the back tank and as a result it doesn't build enough pressure.
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Thanks for the suggestions guys. I had one guy tell me to disconnect the rear fuel line near the tank and blow air thru the front fuel rail to clear the lines. I put about 100psi thru the valve at the back of the fuel rail with it switched to the rear tank. I couldn't be there to see what came out, but I re-attached the fuel line and now it runs fine. I guess it must have been some junk in the line restricting it. I hope it all blew out, but if it didn't, I know what to do next time.
John
John
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