Question about 1991 Ford F150

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My 1991 Ford F150 4.9l rear fuel pump does not get any fire

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  • 17 Answers

Check the relay under the hood it is on the driverside

Posted on Jan 01, 2011

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Posted on Jan 02, 2017

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SOURCE: rear fuel pump 1991 F150 will not turn on,, front

Do you have a fuel guage reading for the rear tank when selected? Unplug the rear tank fuel pump electrical connector and check for voltage on the terminal with the brown/ white wire and the orange wire should be twelve volts. If nothing then measure the orange wire for continuity to ground should close to 0 or .1 ohms. If no continuity between ground and the orange wire then you have an open on the orange wire this needs to be repaired so that when you test for continuity again it is within range. If you have twelve volts now between the connector terminals. Plug the connector back in and try the pump again. If you had 12 volts to begin with disregard the repair above. Unplug the front fuel pump electrical connector and test for continuity between the terminals on the tank that the red and orange wires go to. Record the readings. Now you a baseline of what the rear tank fuel pump should read. Now do the same test on the rear tank between the terminals on the fuel pump where the brown/white and orange wires go. Chances are you'll find out the rear pump it self is bad from not being used for a while.

Posted on Apr 08, 2010

Testimonial: "Gives me a baseline to do test,, had rear tank down & out,, pump does work,, figure wire problem or connector problem,, will do more research,,!!!!!!!"

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1991 ford f150 fuel problem


Is it possible the fuel hoses are not hooked up right ? If you only changed the rear pump and the lines are correct, its possible the new pump damaged the check valve in the front pump. The valve could have been about to fail before replacing the rear pump.
You may be able to block the line going into the front tank and run the truck from just the rear tank.

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