Dead Fuel Pump??? Which One?
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New User
Joined: Apr 2004
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Dead Fuel Pump??? Which One?
First time posting here, usually i'm on the SHOforum, even though I love the truck equally as much 
Well I'm totally confused. I have an 88 F150 with the 4.9 and dual tanks. She died on me yesterday and I'm thinking its the fuel pump. Starts when I spray starter fluid in the intake and the pump has been whinning loud for a while, and it's always below empty.
I'm confused as wheiter or not I have one, two or three fuel pumps. On the frame rail there is a black box that both tanks tie into, than go to what I believe is a fuel pump than to the fuel filter and to the motor. Is the fuel pump the thing in the middle (there are connectors going to it) and is there another in each of the tanks. BTW: The truck doesn't start on either tank. Thanks alot in advance!!
Long live the straight six
Well I'm totally confused. I have an 88 F150 with the 4.9 and dual tanks. She died on me yesterday and I'm thinking its the fuel pump. Starts when I spray starter fluid in the intake and the pump has been whinning loud for a while, and it's always below empty.
I'm confused as wheiter or not I have one, two or three fuel pumps. On the frame rail there is a black box that both tanks tie into, than go to what I believe is a fuel pump than to the fuel filter and to the motor. Is the fuel pump the thing in the middle (there are connectors going to it) and is there another in each of the tanks. BTW: The truck doesn't start on either tank. Thanks alot in advance!!
Long live the straight six
Freshman User
Joined: Feb 2003
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Did the whining stop? From front to back you have the filter, high-pressure pump, mechanical crossover valve, in-tank pump. Power comes from fuse box to the inertia switch to the fuel pump relay to the selector switch on the dash to the high-pressure pump and selected in-tank pump. When you first turn the key on you should hear the pumps for about 3 seconds.
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Joined: Apr 2004
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Thanks for the fast response...
When I flip the key on I actually dont hear anything, there is a lot of clicking though from the engine compartment so some relays are definatly working. It could be coincidence but everything was working fine till a friend covinced me to scan the CE light which had been flickering for, well years
. We scanned, got an error saying the system would not respond so we gave up and went to start the truck and nothing. I'm kindof thinking that was an unrelaed problem, maybe connectors were dirty and this is just a coincidence that this died?? I check connections, doesn';t appear as if we dislodged anthing. Thanks
When I flip the key on I actually dont hear anything, there is a lot of clicking though from the engine compartment so some relays are definatly working. It could be coincidence but everything was working fine till a friend covinced me to scan the CE light which had been flickering for, well years
. We scanned, got an error saying the system would not respond so we gave up and went to start the truck and nothing. I'm kindof thinking that was an unrelaed problem, maybe connectors were dirty and this is just a coincidence that this died?? I check connections, doesn';t appear as if we dislodged anthing. Thanks
