I have a 1992 Ford F-150 5.8 liter with automatic trans. Something is draining the…
We had the fuel pump replaced and now something keeps draining battery.
First step would be to make sure nothing is left on. This includes the glove box being closed, etc. Best way to check is to wait till it is dark out and look for a light on. Fords are prone for door latch assembly failure that cause the dome light(door open) to stay on. Hard to notice during the day but it will drain a battery fast. None f this would be related to the fuel pump being replaced. Also check the under-hood light being stuck on.