Question about 1990 Ford F250

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90 f-250 dual tanks>7.5 rear fuel pump not working looking for ground to check> new pump still not working> any ideas?

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Fuel pump faults,=one way valves not seating properlly
diaphrams puntured, blocked with dirt from tank ,fuse gone in feed ,no earth return to body, try along these thoughts,

Posted on Jul 09, 2010

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Truck with dual tanks wont run unless i mess with tank select switch what to look for?


I would start with a new switch. If the rear tank is showing full and you know the tank is empty it could be a bad ground.

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Check tanks for balance tube between tanks If the air pressure is not allowed to equalise between tanks then the vacuum formed will not allow fuel to flow to the pump. Breathers on both tanks are a start.

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Nov 14, 2010 | 1990 Ford F250

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'96 f150,4.9 six,dual fuel tanks,replaced front fuel pump,not starting.could it be the fuel cut-off safety switch or fuel pump relay.need location of both,owners manual missing.does rear tank pump need to...


I have a 1996 f150 and I had the same problem. I finally found out that the rear fuel pump is the main pump, and if it goes out then the front pump will not work either. There is a groud that both pump share on the rear cross member. If you are not getting good connection with the ground the fuel pumps will not work. Also if you replace the rear pump and it still does not work then your problem could be the fuel tank selector switch, it acts as a relay if it goes out then neither pump will work.

Jun 11, 2010 | 1996 Ford F150 Regular Cab

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First front fuel pump stopped working then next rear fuel pump stopped working pumps both work tried relays that didnt work fuses checked as well so now what


Check the engine to body ground strap. Top rear of engine screwed to firewalll. Or ground the tank to the frame.? Good luck

Nov 18, 2009 | 1990 Ford F150

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1987 f-150 dual tanks fuel problem


You are right. There are three pumps. It sounds like the transfer pump in the front tank is bad. The in tank pumps just supply the high pressure pump to keep it primed. You need the front pump.

Sep 21, 2009 | 1987 Ford F 150

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1992 f-150 dual gas tanks tank closest to cab of truck pumps gas out the fuel cap


A FORD EQUIPED WITH DUAL TANKS THIS YEAR MODEL HAS CHECK VALVES IN THE FUEL PUMPS .THE FUEL RUNS FROM THE REAR TANK WHEN IT IS POWERED ON TO A TEE AND INTO THE SAME LINE AS THE FRONT PUMP . THE PROBLEM IS AT THE BOTTOM OF THE FRONT FUEL PUMP THERE IS A CHECK VALVE ON THE FOOT AND IT IS NOT WORKING.WHILE THE TRUCK IS RUNNING WITH THE REAR FUEL PUMP ON IT IS PUMPING FUEL INTO THE FRONT TANK . IT WILL RUN OUT OF THE NECK WHEN IT IS FULL.THE FIX IS SIMPLE REPLACE THE FRONT FUEL PUMP. THEY DONT MAKE A CHECK VALVE REPLACEMENT I CHECKED I HAD THE SAME PROBLEM AS YOU.

Jun 02, 2009 | 1992 Ford F150 SuperCab

1 Answer

95 F150 2wd, interrupted fuel from the front fuel tank


my idea, the pumps are working agianst each other. what is the line pressure supposed to be? I think the rear pump is burning the new pumps up. is the rear pump running when the front pump is running? Let me know MrrodneyLong@gmail.com

Jul 03, 2008 | 1995 Ford F150 Styleside Regular Cab

1 Answer

F-250 FUEL PROBLEM


Hi, My brothers 250 had the same problem and is now fixed.The fuel pump in each tank has a check valve that allows the fuel to run in one direction only. When this valve fails to close fuel runs into that tank when the other pump is running. We replaced the pump and all is well. Dan

Jul 03, 2008 | 1993 Ford F250

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