Both fuel pumps will not turn on

190,000 MILES • 5.8L • V8 • 4WD • AUTOMATIC
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DAEDRIC
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Few weeks ago my truck set for two days then I go to start it it cranks but no start. I listened for the fuel pumps to kick on and neither one of then kick on at all. They both stopped working. Any ideas would be appreciated. Thank you
Dec 6, 2018 at 12:17 PM
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ASEMASTER6371
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Good morning,

Do you have a test light or voltmeter to do some checks?

We need to verify power to the inertia switch to be sure there is power coming from the relay.

I attached a wire diagram for the system, but we have to be sure there is power to the switch. When you turn on the ignition, it will only be there for two seconds. If you crank it, it should have constant voltage.

Roy
Dec 7, 2018 at 12:17 AM
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DAEDRIC
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I have checked the relay. I checked the switch everything is getting power but not the pumps, both of them do not kick on. Thank you for the reply.
Dec 7, 2018 at 3:08 AM
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ASEMASTER6371
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Okay, back to my question, do you have power to the inertia switch?

We need to do this in stages to find where the power is lost.

Roy
Dec 7, 2018 at 3:10 AM
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DAEDRIC
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Yes it does have power even my father tested it.
Dec 7, 2018 at 3:31 AM
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ASEMASTER6371
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Okay, then the next stop is the tank switch. The red/white wire should have power when the inertia switch is closed. Can you verify that?

Roy
Dec 7, 2018 at 3:34 AM
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DAEDRIC
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That was the second thing I checked. Could it be the wires running to the pump themselves? So far everything I checked has been working fine.
Dec 7, 2018 at 3:49 AM
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ASEMASTER6371
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Again, will you answer my question on power to the switch?

If you want me to help, I need information in order to get you to a resolution.

Roy
Dec 7, 2018 at 3:56 AM
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DAEDRIC
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I just figured out the problem a wire was pulled loose and now their turning on. I am very sorry if this was a waste of time. I do appreciate the help.
Dec 7, 2018 at 5:35 AM
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ASEMASTER6371
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No worries, we are here to help.

Roy
Dec 7, 2018 at 6:01 AM
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