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I have an '88 F-150 300 I-6 with dual tanks. I fill up both, I use front tank first, then switch to rear when it gets less than 1/4 tank(roughly 175-200 miles). Once the tripometer reaches right around 200, the truck starts sputtering like its out of gas. I give it more throttle and it keeps up, but if I drop off the gas, it dies. Now, if the rear tank is full why is it doing this?
I thought at first it was debris in the rear tank, so I put in some gas additive(forget the name, red bottle, not redline??). Filled up again, I put 19.4 gallons in the 19 gallon front tank. Not sure how that works. Went 200 miles again and it sputtered, so i filled up the front tank.
Is it possible that the fuel pump on the rear is not working and it continues to pull from the front tank even when the rear is selected?
I believe Ford had a recall a few years ago for a tank selector switch failure? Mine (90, F-250) would pump from one tank to the other when switched one way and not pick up when switched the other. I contacted the Ford dealer and they replaced it under warrantee. You might check that out.