Nickmont

I have a 1993 f-150 6 cylinder (140k mile) that I purchased new in 1994. Recently it began "missing" and at the same time, the clock radio resets to 0:00 hrs, particularly after sitting all night. I removed both the positive and negative battery cables, cleaned them, and reinstalled... no good. Worked fine for a day and then the problem reappeared. I replaced the 5-yr old battery... still no success. Several years ago, I replace the ignition keylock, which sticks on occasion. Not sure if that could be contributing to the issue. The motor operation symptoms feel similar to having an in-tank fuel pump going out - which I've replaced both within the last 3-yrs. However, it doesn't explain the electrical problem and it seems unlikely that both tank pumps would fail at the same time, as the problem occurs when operating either tank.

I'm not a mechanic by trade, but was forced to learn to fix the few issues I've had with this great truck when we lived in the remote Alaskan bush. Sites like this one have been my "saving grace". Thanks much... Nickmont

Johnny Mullet

The pumps in the tank are low pressure. There is a high pressure pump on the frame rail.

Nickmont

Mulletman

A few posts down it is stated: " '85-89s with EFI all have THREE fuel pumps. two are in the tanks (low pressure pumps) and one high-pressure pump externally mounted on the frame rail. '90+ all have only two high-prressure pumps inside the tanks. "

I believe I only have one in each tank. Went out and started the truck this am... cool and humid and guess what... the radio clock was rest again. Haven't driven it to work yet but as my only set of wheels, I will be testing it this am. I'm not sure where to begin as the missing on the road appears to be linked to the electrical issue. Ideas??? thanks