It's an '87 Cherokee. The fuel pump, filter, and tank and had recently been replaced by the PO. I drove it home yesterday and parked it. When I came back out to test out the new coolant and oil pressure sensors I had swapped in (recently did a gauge cluster swap from idiot lights to actual gauges), the cherokee wouldn't start. It turned over great, but the fuel pump wasn't priming. It started hailing, so I left it alone over night.
This morning I measured voltage at the pump, and it was receiving ~12V during priming and around 10.5V when cranking. So I pulled the pump to replace it.
Just for fun, I directly wired the pump to the battery to see if it was really, really dead. It ran! I ran it both directions, and it runs fine (slower in reverse, faster when wired correctly). I hooked it back up to the connector in the rear, just out of the tank, and it runs great now. The heck?
We're talking maybe 1000 miles on the tank, filter, and pump. I can't figure out what managed to clog it. Or jam it? Or whatever it. Could it be bad gas? Maybe just a fluke?
This morning I measured voltage at the pump, and it was receiving ~12V during priming and around 10.5V when cranking. So I pulled the pump to replace it.
Just for fun, I directly wired the pump to the battery to see if it was really, really dead. It ran! I ran it both directions, and it runs fine (slower in reverse, faster when wired correctly). I hooked it back up to the connector in the rear, just out of the tank, and it runs great now. The heck?
We're talking maybe 1000 miles on the tank, filter, and pump. I can't figure out what managed to clog it. Or jam it? Or whatever it. Could it be bad gas? Maybe just a fluke?