Question about 1991 Ford F150

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

I have a 1991 Ford F150 4 x 4 inline 6 4.6L. Dual tanks. When I switch the fuel tank switch to the front tank, the truck dies. It is a 5 speed. The rear tank work great. Front tank full of fuel! I jsut got this truck. Not sure where to start.
Thanks!

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  • kilipouris May 08, 2009

    There is no sound made from that tank if the key is turned to on and that tank is selected. Is this a power issue or a bad pump?

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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

Posted on May 07, 2009

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Posted on Jan 02, 2017

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Monster80
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SOURCE: where is the fuel tank selector valve exactly located

Just in front of the side tank is the selector.Very common problem.The rear fuel tanks pump quits.

Posted on Mar 30, 2009

ftw1952
  • 10319 Answers

SOURCE: 1982 chevy truck with dual gas tanks with guage or tank problems

all you need to do is listen to hear the tank switching valve is working. It will make a soft noise under the rear cab section with the key on with the engine off. zif you do hear it sounding the switch your tank unit for that one tank you try to switch to is a fault. Sorry no illustrated diagrams are on hand, just knowledge

Posted on Feb 05, 2010

  • 14036 Answers

SOURCE: Working on a 1991 F150 5.0L, Sometimes the you

YOU HAVE A TANK MOUNTED PUMP AND FRAME MOUNTED PUMP.THEY BOTH SHARE THE SAME RELAY AND INERTIA SWITCH.YOUR FUEL PUMP RELAY COULD BE BAD.OR BAD CONNECTION AT INERTIA SWITCH OR SWITCH ITSELF CAN BE FAULTY.SHORT OPEN HOT WIRE TO BOTH PUMPS OR POOR BROKE GROUND WIRE.

Posted on Mar 08, 2010

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Please Help ME by Remembering to RATE ME Thank you Vrey Much !!!

This vehicle does not use an external fuel tank switching valve. A supply check valve in the fuel pump assembly opens when the outlet pressure from the energized fuel pump exceeds the opposing check valve spring force.


R E C A L L 1991
THE DUAL FUEL TANK SELECTOR VALVE MAY MALFUNCTION AND CAUSE AN OVERFILL CONDITION IN ONE OF THE FUEL TANKS, RESULTING IN AN OVERFLOW OF FUEL PAST THE FILLER CAP.
THE OVERFLOW OF FUEL PAST THE FILLER CAP CAUSES A FUEL LEAKAGE, WHICH CAN RESULT IN A FIRE WHEN EXPOSED TO A SOURCE OF IGNITION.
REPLACE THE DUAL FUEL TANK SELECTOR VALVE.
SYSTEM: FUEL TANK, AUXILIARY.
VANS AND LIGHT TRUCKS WITH DUAL FUEL TANKS PRODUCED IN THE FOLLOWING PERIODS: F150, F250, AND F350 LIGHT TRUCKS BUILT BETWEEN FEBRUARY 28, 1989 AND JULY, 1989; ECONOLINE BUILT BETWEEN FEBRUARY 28, 1989 AND FEBRUARY 11, 1991.
NOTE: FORD HAS AGREED TO RECALL THESE VEHICLES BUT PARTS ARE NOT YET AVAILABLE.PARTS WILL BE AVAILABLE IN DECEMBER 1991. YOU WILL RECEIVE A LETTER FROM FORD ADVISING YOU WHEN TO SCHEDULE AN APPOINTMENT WITH YOUR DEALER TO HAVE THE RECALL WORK PERFORMED. IN THE MEAN TIME, YOU CAN TAKE THE FOLLOWING PRECAUTIONS:FILL EACH TANK TO ONLY 1/3 FULL. IF YOUR VEHICLE LEAKS FUEL OR IF YOU SMELL FUEL, STOP USING THE VEHICLE AND CALL FORD AT (313) 446-4654 AND ADVISE THEM OF YOUR PROBLEM. REFER TO FORD SAFETY RECALL NUMBER 91S39. AN OPERATOR WILL TAKE YOUR NAME AND TELEPHONE NUMBER. A FORD REPRESENTATIVE WILL CALL YOU BACK

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