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Ok, I've never posted here before, so please be gentle, but this is driving me insane.
I have a 1996 F-150 XLT super cab with the 5.0L V8 (N engine code), and dual fuel tanks. I'm having the exact same problem everyone else seems to have eventually... when I run on the rear tank, fuel returns to the front tank, and eventually overflows it. Everything I see about this explains that the fix is to replace the 'fuel tank selector valve'.. fair enough.
Only one problem... there is no such valve on my truck. When I follow the fuel & return lines aft from the fuel filter, I come to a small L-shaped metal block, with each line running straight through one side of the 'L', and lines that branch off to the midships tank. The brake line is routed through the 'bend' of the L.
Even Official Ford Parts Site | Buy Motorcraft & OEM Ford Parts Online | FordParts.com, when I search for the vin of my truck, tells me I should have a "Fuel Pump Reservoir And Tank Selector Valve", part F1UZ-9B263-B... there is no such critter to be found, and everything that is there (other than the filter, of course) is obviously original.
Last edited by Ray Vanlandingham; Sep 20, 2016 at 11:14 PM.
Reason: clarify
Awesome, thanks guys. I actually had been planning to drop the front tank at some point... my fuel level sender doesn't work. When I obtained the vehicle a couple of years ago the back one didn't work either, but it was simply due to accumulated 'crud' making it stick.. a simple bath in WD-40 while wiggling it made it move again, and it was a opportunity to give the tank a coat of rust inhibitor. This is just more incentive to go ahead and drop the front one (I can't take the bed off because of a spray-on bed liner installed by a previous owner).
