1990 F-150 no fuel...

1979_4x4_Plow · 06-29-2008, 04:58 PM

let me state things i have done so far...

i have replaced front fuel pump, relay, fuel filter.

i know for sure pump is good since i used jumper wires to the pump to get it to turn on. i have used a good relay out of another vehicle that runs, but i am not getting power to the inertia switch. i think my problem lies someplace in between the relay and the inertia switch.

does anybody have a diagram of how the wiring is ran on this? i am trying to figure out if the power goes to inertia switch than to the tank selecting switch or other way around. any help is appreciated.

1979_4x4_Plow · 06-29-2008, 08:31 PM

would it hurt the truck any to run a new line from the relay to the inertia switch in order to get power since i think that is where my problem is.

mrjohnwayne · 06-30-2008, 07:08 AM

As long as you used an inline fuse with the new wire I don't think it would be a problem. I think you can go to autozone and they will print out a wiring diagram for you...

tjzz4 · 06-30-2008, 11:59 AM

Are you aware there is only power to the inertia switch for 3 seconds after key on or unless you are cranking the engine?

1979_4x4_Plow · 06-30-2008, 03:43 PM

i had the test light hooked up to inertia switch when turning ignition to on position with no power lighting my tester.

06-29-2008, 04:58 PM	#1
1979_4x4_Plow Senior Member Join Date: Dec 2007 Posts: 98	1990 F-150 no fuel... let me state things i have done so far... i have replaced front fuel pump, relay, fuel filter. i know for sure pump is good since i used jumper wires to the pump to get it to turn on. i have used a good relay out of another vehicle that runs, but i am not getting power to the inertia switch. i think my problem lies someplace in between the relay and the inertia switch. does anybody have a diagram of how the wiring is ran on this? i am trying to figure out if the power goes to inertia switch than to the tank selecting switch or other way around. any help is appreciated.

06-30-2008, 07:08 AM	#3
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,101	As long as you used an inline fuse with the new wire I don't think it would be a problem. I think you can go to autozone and they will print out a wiring diagram for you... __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

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06-29-2008, 08:31 PM	#2
1979_4x4_Plow Senior Member Join Date: Dec 2007 Posts: 98	would it hurt the truck any to run a new line from the relay to the inertia switch in order to get power since i think that is where my problem is.

06-30-2008, 11:59 AM	#4
tjzz4 Senior Member Join Date: Oct 2007 Posts: 212	Are you aware there is only power to the inertia switch for 3 seconds after key on or unless you are cranking the engine?

06-30-2008, 03:43 PM	#5
1979_4x4_Plow Senior Member Join Date: Dec 2007 Posts: 98	i had the test light hooked up to inertia switch when turning ignition to on position with no power lighting my tester.