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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Check the relay under the hood it is on the driverside

Posted on Jan 01, 2011

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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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3 Answers

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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1 Answer

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Fuses are on drivers side torwards the fire wall. There is also a fuel pump relay under the hood, drivers side.

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What is the easiest way to replace rear fuel pump on a 1991 ford f-150?

pull the bed off is the easiest way, is there is no bed liner? if there is then u must drop the fuel tank down

Apr 29, 2010 | 1991 Ford F150

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It wont start/probally fuel pump/fusses are good

If you have dual tanks try changing the fuel selector switch. Also make sure you are getting fire to your spark plugs. If that's not the case then it is your fuel pump, and one more thing turn key to the on position listen to hear the pump come on for two seconds.

Feb 22, 2010 | 1991 Ford F150

2 Answers

Where is the fuel pump located in a 1991 ford f-150 6cyl with front and rear fuel tanks

the fuel pump is connected to the sending unit inside the gas tank. If you go under the truck and drop the tank you should find a hole on the top. tap the ring at the top of the tank till it spins off. now you can remove the sending unit and the pump. the pump should just unplug on most models if not then unscrew the wirring and remove it. now just put every thing to gether with the new pump an install the reverse way you took it of.

Feb 15, 2010 | 1991 Ford F150

1 Answer

Just bought 1991 Ford Probe lx v6 won't start

If you have spark and fuel (either via the injectors or spraying fluid into the intake), and still no evidence of firing, it suggests your valvetrain may not be working. If the valves can't open, the fuel cant get into the cylinder.

Do (or have done) a compression test. You may have a broken timing belt/chain.

Dec 15, 2009 | 1991 Ford Probe

1 Answer

I have a 1991 Ford F150 4 x 4 inline 6 4.6L. Dual

your truck is a 4.9L, make sure you have power to the front tank fuel pump. is the power to the pump is ok and you can hear the pump run for a second or two when you key the vehicle on... replace the fuel tank selector valve

Apr 17, 2009 | 1991 Ford F150

1 Answer

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Can't find what? The switch valve? It has fuel pumps in each tank. You likely have a bad fuel pump in the rear tank.

Apr 08, 2009 | 1991 Ford F250

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