no power at fuel pump
#1
no power at fuel pump
2002 Ford F150 5.4 4X4 the fuel pump relay seems to be working, i hear it click using a test light but the light barely glows (my buddy suggested this might indicate a grounding out condition or something else is pulling off this relay), but no power is going to the circular 4 prong connector that connects to the fuel pump. I do not have dashes on the odometer, the theft light is not blinking, could the fuel pump driver module be the culprit, the last morning i was able to drive my truck my battery light was coming on and going off intermittently, then totally died later on the way home and has started briefly a couple of times but dies shortly after, now my battery seems to be going dead, could a low battery also cause the fuel pump not to turn on? also i have checked all fuses and the fuel pump reset in the passenger kick panel
#5
Join Date: Jun 2002
Location: Under the flightpath of old ORD 22R
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Try swaping the fuel pump relay with one from the trailer tow adapter ( seem to recall the battery charge relay is the same size ).
The battery issue does need to be addressed ( as noted above ) but if you are not getting the same power on both sides of the relay, this would be my suggestion.
The battery issue does need to be addressed ( as noted above ) but if you are not getting the same power on both sides of the relay, this would be my suggestion.
#7
charged the battery, replaced the alternator, then jumped the fuel pump relay to pressure the line and the fuel pump did not turn on as i got no pressure and did not hear it come on, is there any way to verify if the fuel pump is bad, i have heard of wiring it straight to the battery to test it, or should i be looking somewhere else, the fuel pump is less than 4 years old. when i do jump the relay i get power to 1 out of 4 prongs on the harness that goes to the fuel pump is this correct. I have tried eight different relays
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#8
Join Date: Jun 2002
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The 4 wires ( from the 2001 EVTM )
Pink w/ Black stripe wire = + VDC from the Fuel Inertia switch
Black = Ground
Fuel pump module ( fuel level )
Yellow w/ white stripe wire = to the instrument cluster
Black w/ Orange Stripe wire = Ground ( ref for gauge ).
If you have power to the Pink w/ Black stripe wire you know that part is functional from the fuse ( through the relay and inertia switch ) to the harness at the fuel pump.
Did you happen to use the ground on the connector when checking for VDC at the Pink w/ Black stripe wire ? ( make sure it is not a ground issue ) ?
did you try smacking the bottom of the fuel tank a few times with a rubber mallet ( don't use a hammer it can damage the tank ) ?
- Some times the fuel pump will hang up and slugging the tank will break it free. give it 8 to 10 smacks and a second before trying it.
Pink w/ Black stripe wire = + VDC from the Fuel Inertia switch
Black = Ground
Fuel pump module ( fuel level )
Yellow w/ white stripe wire = to the instrument cluster
Black w/ Orange Stripe wire = Ground ( ref for gauge ).
If you have power to the Pink w/ Black stripe wire you know that part is functional from the fuse ( through the relay and inertia switch ) to the harness at the fuel pump.
Did you happen to use the ground on the connector when checking for VDC at the Pink w/ Black stripe wire ? ( make sure it is not a ground issue ) ?
did you try smacking the bottom of the fuel tank a few times with a rubber mallet ( don't use a hammer it can damage the tank ) ?
- Some times the fuel pump will hang up and slugging the tank will break it free. give it 8 to 10 smacks and a second before trying it.