68 f100 390 EATING fuel pumps by the dozen
Help! My truck sat for 10 years. rebuilt it with my son for him to drive and it has become a nuisance. First fuel pump lasted 12 minutes. was old. no problem. 2nd pump went 2 months. figured it was just Chinese junk. has eaten 5 more since. total of 7 in 3 months. flushed the tank with kerosene and bolts. ate a pump days later. rubber lines are new. installed a 10 micron fuel filter and the pump went out idling at a stop 2 days later. New pump installed that night. no start the next morning. I will stop now. I am having the tank hot tanked at a radiator shop this week. replacing the steel fuel line, filter, and fuel cap. the fuel cap may not be venting. can't imagine that caused the pumps to fail though. what the hell fails these pumps? side note, the tach is moving backwards as I crank the engine. what causes that? maybe I am chasing a different problem?