Fuel Pump Help
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Trailering
Joined: Jan 2022
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Fuel Pump Help
I have a 1995 F-150 4.9L with single fuel tank.
I replaced my whole fuel tank and sending unit (aft axle tank) tried to start it up and there's no power to the pump. Relay and fuses are good. Just not sure about the wiring to the pump. None of the colors match and there's no instructions that came with it. I found a guide online from the brand (Spectra Premium) that seems to be for the
same pump. But it's still not clear since these truck side harnesses seem to have changed many times.
Truck side harness has yellow w/blue, orange, black, brown w/white.
Original pump side harness has black, red w/black, yellow, grey w/redNew pump harness has purple, black, black w/white, white
Any help is appreciated!
I replaced my whole fuel tank and sending unit (aft axle tank) tried to start it up and there's no power to the pump. Relay and fuses are good. Just not sure about the wiring to the pump. None of the colors match and there's no instructions that came with it. I found a guide online from the brand (Spectra Premium) that seems to be for the
same pump. But it's still not clear since these truck side harnesses seem to have changed many times.
Truck side harness has yellow w/blue, orange, black, brown w/white.
Original pump side harness has black, red w/black, yellow, grey w/redNew pump harness has purple, black, black w/white, white
Any help is appreciated!
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
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Trailering
Joined: Jan 2022
Posts: 20
Likes: 2
this helped confirm that I had the correct wiring.
Should I be getting 12v to the pump? I'm only measuring a peak of ~9v with key on.
I bench tested the pump with 12v and it works fine.
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Trailering
Joined: Jan 2022
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I took that reading, during that second or two of key on time. It peaks at ~9v for the couple of seconds.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Try it again and after you get the reading, crank or start the truck and voltage should go to battery level voltage. If not, swap the fuel pump relay with the horn relay and check again.
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Trailering
Joined: Jan 2022
Posts: 20
Likes: 2
I'll give that a shot.
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