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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 04-29-2015, 07:12 AM
justminsa justminsa is offline
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Hello and I am located in San Antonio, TX. I have a 1993 F150 extended cab, with 5.8 and a E4OD. This forum is great and has helped with a few things before. Now I have a problem I can't figure out. I have replaced the rear tank fuel pump assembly due to the fact the truck bogged pretty bad when stepping on the gas. That problem is solved. Of course I did not read the instructions (LOL). Truck runs good off that tank but the fuel gauge always reads full. I went bad and read the instructions and it says you have to change the supplied pigtail on the truck side of the wiring. Only 4 wires no big deal. Easy right, well wrong. Swapped out the pigtail, and the truck will not start off either tank now. I have checked for spark and it is fine. I can start the truck with starter fluid. I know it is getting fire, but no fuel. I cannot hear the pumps when you turn the key on. I have checked the fuel circuit breaker, it is not popped. I have checked all the fuses and relays. All seem to be good. I can switch from front to back on the tank selector and watch the gauge move. So that seems to be working properly. I am out of ideas. Anyone have any ideas. Could it be the computer.


Thank you,
Mark
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Old 04-29-2015, 07:31 AM
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To start with a pegged full fuel gauge means an open circuit to ground when the selector switch is switched to the rear tank.

Does the fuel pump relay click when you turn the key to on and drop back out one second later each time you turn on the key?

I have not heard of adding a pig tail to the fuel delivery module when changed out on a 1993 F150. The only pig tail I know of is for the new stile turbine fuel pump on the F53 chassis.
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Old 04-29-2015, 07:54 AM
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I vaguely remember having to do a pigtail swap when replacing the sender/pump in my 92 F150 a while back. I'd re-check those new connections first. It sounds like the signal to run the tank pump isn't getting back there. could be as simple as a wiring glitch.
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Old 04-29-2015, 08:09 AM
justminsa justminsa is offline
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no start.

Quote:
Originally Posted by subford View Post
To start with a pegged full fuel gauge means an open circuit to ground when the selector switch is switched to the rear tank.

Does the fuel pump relay click when you turn the key to on and drop back out one second later each time you turn on the key?

I have not heard of adding a pig tail to the fuel delivery module when changed out on a 1993 F150. The only pig tail I know of is for the new stile turbine fuel pump on the F53 chassis.

I do not hear the relay clicking. also if I switch to the front tank it does not start either. And no clicking of relay.
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Old 04-29-2015, 08:16 AM
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Then turn on the key and ground pin #6 of the self-test connector and see if the fuel pump relay clicks as you ground and in-ground pin #6 of the self-test connector.
Click the image to open in full size.

You can also try to jump between pin #2 and pin #6 of the self-test connector but try grounding pin #6 first.
pin #6 of the self-test connector.
Click the image to open in full size.

Click the image to open in full size.
/
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Old 04-29-2015, 08:20 AM
justminsa justminsa is offline
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Originally Posted by subford View Post
Then turn on the key and ground pin #6 of the self-test connector and see if the fuel pump relay clicks as you ground and in-ground pin #6 of the self-test connector.
Click the image to open in full size.

You can also try to jump between pin #2 and pin #6 of the self-test connector but try grounding pin #6 first.
pin #6 of the self-test connector.
Click the image to open in full size.

/

Thanks I will try that today when I get home. If the relay clicks when I ground pin #6, then the relay is good. Correct. Also what should happen when I jump pin #2 and pin #6.
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Old 04-29-2015, 08:31 AM
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Check the FP fuse. Did you disconnect the battery when you rewired? May have shorted out the circuit with power going to it.
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Old 04-29-2015, 08:33 AM
justminsa justminsa is offline
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Originally Posted by broncoderek View Post
Check the FP fuse. Did you disconnect the battery when you rewired? May have shorted out the circuit with power going to it.


I have checked all the fuses and they are good. Yes I did disconnect the battery first.
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Old 04-29-2015, 08:37 AM
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Quote:
Originally Posted by justminsa View Post
I have checked all the fuses and they are good. Yes I did disconnect the battery first.
I assumed you did. Hope it didn't come off as insulting.
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Old 04-29-2015, 08:49 AM
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Quote:
Originally Posted by broncoderek View Post
Check the FP fuse. Did you disconnect the battery when you rewired? May have shorted out the circuit with power going to it.
The fuel pump fuse as no bearing on if the fuel pump relay clicks or not.
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Old 04-29-2015, 08:52 AM
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You might also check if the PCM Power relay clicks each time the key is turned on.
As the PCM Power relay must be made (closed) before the fuel pump relay will close.
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Old 04-29-2015, 09:03 AM
justminsa justminsa is offline
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Quote:
Originally Posted by subford View Post
You might also check if the PCM Power relay clicks each time the key is turned on.
As the PCM Power relay must be made (closed) before the fuel pump relay will close.
How can I check the PCM power relay. Sorry for all the questions.
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Old 04-29-2015, 09:14 AM
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Quote:
Originally Posted by justminsa View Post
How can I check the PCM power relay..
The PCM power relay supplies power over red wires to all the fuel injectors beside the fuel pump relay coil and other solenoids.
So with the key on check for power at any of the fuel injectors red wire with a loading test light.
If the test light lights the PCM power relay is closed.
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Old 04-29-2015, 09:31 AM
justminsa justminsa is offline
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Quote:
Originally Posted by subford View Post
The PCM power relay supplies power over red wires to all the fuel injectors beside the fuel pump relay coil and other solenoids.
So with the key on check for power at any of the fuel injectors red wire with a loading test light.
If the test light lights the PCM power relay is closed.


Awesome, thanks. I will try that tonight too.
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Old 04-29-2015, 07:07 PM
justminsa justminsa is offline
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Originally Posted by justminsa View Post
Awesome, thanks. I will try that tonight too.
OK checked the relay using key on and jumped#2 and #6. Relay clicked. Also with key on used test light on red wire of the injector. It lite up. So at the point I would assume the relay and computer is good. Now I am really lost.
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Old 04-29-2015, 07:07 PM
 
 
 
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