Question about 1991 Ford F250

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This truck has one tank but a selector switch for front and rear tank is the fuel pump inside the tank . There is something mounted to the rail right before the tank. I'm guessing this is the switch for swapping front to rear. Will they be two pumps? The problem is not enough pressure to the filter what checks can be done before dropping the tank

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Looks like the fuel/float pump is indeed inside the tank. There should only be one pump. Generally, you can get under the truck near the tank, and have someone turn the key to "on" (not start the truck, just turn it on), and you should hear a "whirrrrrrrrrrrrrr" noise inside the tank if the fuel pump is in there. Of course, if the fuel pump has died, it won't make any noise, so that's not always a good way to tell.

Posted on Sep 16, 2010

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Fuel filter light comes on when change from rear tank to front tank fuel filter has been change, is there an fuel relay if is where,


I am guessing that your truck is a Diesel. There is no electric fuel pump on the diesel models. The fuel filter light comes on when there is not enough fuel pressure. Possible problems include the selector vavle not fully switching, and/or an obstruction in the pick up in the front tank.

the selector valve is located underneath the truck on the inside of the frame rail on the drivers side If I remember right. Try swtiching to the front tank and tapping the selector valve assembly. If that clears up the light then the selector valve is sticking and needs to be repaired or replaced.

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1 Answer

I have no gas running to the engine from the front tank, and apparently have gas filling into the front tank from the rear tank. I can only use the rear tank. The switch is set for the rear tank and when I...


Hi:
I have had the exact problem on my ford truck, and fixed it. There is a tank feed shuttle valve mounted to the drivers side frame rail that is the most likely suspect. It operates by fuel pressure and when it fails, it fails so the front tank doesnt work.

It is worth mentioning that there are three fuel pumps on your truck, each fuel tank has a small low pressure pump inside the tank, and there is a high pressure pump located on the drivers side frame rail too, just before the fuel filter.

The front in the tank pump could be bad, too, but most likely the shuttle valve is the problem.

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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.

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1 Answer

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there is a low pressure pump in each tank, we call it the "pickup" pump, it is either bad or the tank selector switching valve on the frame rail is defective

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1 Answer

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You have duel tanks with a fuel pump in each tank. You also have a fuel pump on the frame rail after the "tank selector". This device only holds a fuel filter that protects the main fuel pump. When you select front or rear tank on the dash, you are selecting which in tank fuel pump will operate. You can check the in tank fuel pump by listening for it to "humm" when the key is turned on..The in tank pumps only feed the main pump and cannot run the engine on their own. Hope this helps

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