fuel pump whining
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Freshman User
Joined: Oct 2006
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fuel pump whining
Hey guys. I can hear my fuel pump in the front tank on my 90 f150 whining when the truck is running.does this mean I will be changing a fuel pump soon? I have been relying on the front tank for awhile now because the back tank dumps fuel into the front tank.If the front pump goes will the rear pump pick up from the front tank?someone told me it would,but I want to ask you guys.My next question is: what exactly causes the fuel transfer and how do I fix it? Some tell me there is a valve on the frame others tell me it is in the tanks, so I thought I would tap the knowledge of this site.you guy's really know your fords.
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Welcome aboard!
Well, for starters, you should be able to hear the pump whine. But when my fuel pump went out, I noticed the whining increased significantly and not too long after I noticed the truck bogging and dieing when it was switched on that tank.
The fuel crossover issue is common on these trucks, I think it was more of a problem with the 87-91's though. The 92-96s have a slightly different fuel system.
Sounds to me like you should be looking into some fuel pump repairs. I'll let the others offer some more insite...as I know they will.
Well, for starters, you should be able to hear the pump whine. But when my fuel pump went out, I noticed the whining increased significantly and not too long after I noticed the truck bogging and dieing when it was switched on that tank.
The fuel crossover issue is common on these trucks, I think it was more of a problem with the 87-91's though. The 92-96s have a slightly different fuel system.
Sounds to me like you should be looking into some fuel pump repairs. I'll let the others offer some more insite...as I know they will.
Junior User
Joined: Oct 2006
Posts: 62
Likes: 0
my truck was doing the same thing, the pump was dirty and had hard time suckin fuel. all i did when it quit, was hit the bottom of the tank with a 2x4, that fixed for a year, probly would have lasted longer if i would have took it out and did a good cleaning. I'm just lazy, but got me by.
Senior User
Joined: Dec 2004
Posts: 284
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In my experience, I agree with MustangGT221, you'll be replacing it soon. The fuel pump is in the tank, if it is whining then it is loud and that should mean the pump is going out. I have only seen three things happen with fuel pumps: it whines and then goes out, it goes out or there is a dime-sized diaphram in the unit that can get a crack in it and that will cause it to loose suction and you don't get enough gas to the engine. I hate speaking from experience, that was a hard one to figure out.
good luck
good luck
Lead Driver
Joined: Nov 2002
Posts: 9,556
Likes: 43
From: Concord, NC
I think 90 was the first year for the high pressure in-tank pumps, and the first year that is prone to cross flow. If fuel is going into the front tank, the check valve in the front tank is not working any more. Replacing the front tank fuel delivery module should fix the cross-flow issue, and if you think that the pump is dying, it will fix that too. I think these trucks with the high pressure in-tank pumps are more prone to cross flow than the older three pump systems.
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