Please help, I have a 94 f150 ex cab 5.0 with dual tanks, my problem is that when I drive using the rear tank it runs out of gas very quickly in that tank, when I switch to the front tank I notice that all the gas from the rear tank is now in the front tank. The front tank operates normally and doesn't send fuel to the rear tank, the truck runs fine otherwise, and I don't notice any loss of power/economy on either tank. is there a check valve or return diverter that may cause this?

 

Yes there is a selector valve on the frame in front of the side tank. If you look you'll see 4 lines on the tank side and 2 on the motor side. I had the same problem last fall. The part is around $60, dealership only.

 

Thanks, I'll give that a shot.

 

Or, its the infamous problem with the Fuel Delivery Module(FDM) other wise know as an intank Fuel Pump. These have a shuttle valve that are notorious for failing. Under normal operation...unused gas is supposed to return to the origninating tank...If your front tank is filling up, this could mean that there is a failure of the FDM in this respect.

WHaynes


93 F150 4.9L 4x4
4" ProComp StII Lift
BFG 33in 4.10's
Detroit TrueTrac's

 

I hope it's just the valve,I'll try it first, if not I'll try the pump in my front tank, does holley make one for my 94? if fords pump is prone to failure I'd like to get an aftermarket pump so I only have to do this once.

 

I have the same problem and bought the dual tank selector valve from http://fordpartsonline.com for 48$
I'll have it installed this or next weekend.
I just hope it's not the check valve in the fuel pump.
Keep fingers crossed...
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1988 F-150, 5.0L 302ci, 5spd, SuperCab. Shorty headers, K&N filter, Accell 300 8.8mm race wires, Accell supercoil, Accell rotor+cap, Bosch +4 Platinum plugs, RanchHand bumper, MSD 6a ignition: Soon: dual exhaust.

 

If it isn't the selector valve, remember that your condition (fuel going into front tank) means the check valve IN THAT TANK, ie. fuel pump check valve, is the one that is shot. The new pump with valve will cost you around $200, less if you shop around. Not a hard part to change, though. Toughest part is getting to it. You have to drop the tank, UGH!, or undo your bed bolts, tail light wire harness and fuel tank fill hoses (both) and have someone help you lift and move the bed backwards. The bed isn't heavy and you don't have to move it back much to get to the front tank/pump. Beats the devil out of dropping the tank, unless you have a lift and air tools.

 

Have the same problems, please check the ford recall list there is a recall on that same problem at least for my year 92 F150 The recall says that possible fire can happen. Better safe than sorry, good luck!
candj_1999(No Email Addresses In Posts!)

 

i have a 94 f250 diesle with 2 tanks and it runs very bad it seems like its sucking air from somewhere