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Old 08-04-2015, 07:20 PM   #1
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Join Date: Jul 2015
Location: New York, New York
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Fuel pump power supply?

I am trying to find out what color or which wire coming from the fuel pump relay would be the power to the fuel pump. I replaced the relay but the pump still wouldn't run, after a long day in the hot sun I was getting ready to give up , one last try turning the key...and the pump came on and it started right up, after a couple of minutes it stalled, then no pump again. Up until this it has always been an instant starting engine runs strong no sign of a problem. I shut it off the other day, went out later to start it and no pump.
1990 GS,8343 model, Oshkosh chassis, ford 460 EFI C6 trans just rebuilt.

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Old 08-06-2015, 06:44 AM   #2
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Ford Super Duty Owner
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Join Date: Feb 2012
Location: Hilton Head, SC
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Fuel Pump

I have a 1995 Ford with 460. Have you checked the Inertia switch. On my MH it is located under dash on steering column mount. It is designed to shut off pump if the vehicle should be involved in a collision. A slight jar can trip it. It has a red button at bottom of switch that needs to be pushed in. Google inertia switch for your model rig and you can see if you have one and where its located. Most Ford have one. The wiring for fuel pump goes from relay to inertia switch to fuel pump. If switch is tripped then no power goes to pump. Hope this helps.
39 foot 2000 Newmar Dutch Star Freightliner chassis/300 hp Cat. Allison 6 speed
Retired Fire Fighter who won't retire, but I'm close
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power, fuel

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