dead fuel pump????
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Joined: Jun 1999
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dead fuel pump????
Took the 90 F150 SCab on a 700-mile road trip this weekend...used 33 gallons, so mpg was exceptional for the 4.9L this time...but that's not the weird part. Filled both tanks going and coming back. Each time we switched from front tank to rear, the rear simply pumped the front tank full. Made a pit stop right after this occurred coming home and noticed the rear fuel pump whining...must be that pump as the whine quits when I switch back to front tank. I haven't checked codes yet, but suspect the rear pump is shot. How hard is it to change the pump? Will probably do it myself. Any reliable advice on cost, or other tips appreciated.
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Joined: Mar 2000
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dead fuel pump????
You may want to replace the front fuel pump instead. I have a '91 F-150 that was pumping fuel from the front tank to the rear. Turned out to be the shuttle mechanism on the fuel retrun side of the rear pump was not closing. Your problem sounds like the reverse of mine. it is not hard to remove the fuel tanks, just drain them first. The in-tank fuel pump will run about $150. After tank removal, plug all holes and clean all debris off the tank so it won't get in the tank while removing the pump.
New User
Joined: Apr 2000
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dead fuel pump????
I have the very same problem, when on front tank it will drain both evenly. When on the rear it will fill the front tank.My brother is a ford mecanic (spelling?) , and says there are check valves in the pumps that fail. He did not know of any after market parts to rebuild the pumps, so Ford oem may be the only choice. Keep us posted on what you find out, as I have seen other posts at this forum about this subject and no one had the answer yet.Thanks, Benny
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Joined: Apr 2000
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dead fuel pump????
If the F150 is anything like the F250 (shouldn't be too much difference), the way to get to the pumps is from the top by jacking up the passenger's side of the bed after removing the bed bolts. This way, you don't even need to take the tanks out. I've done it both ways and it was definitely easier this way. Just be sure to have a couple of sturdy 2x4s to prop the bed up high on the passenger side so you can step into the middle of the frame and squat or sit down on the ground while you remove or install the pumps. Also, be sure all the wires are clear of the float when you reinstall it or you may have the float hang up like mine did and your gauge won't work right and you will have to pull the pump out again to fix it.
James Beaman
Friendswood, TX
James Beaman
Friendswood, TX
