McKrunk

Replaced the entire pump and sender unit assembly from a known working exact swap part. Still not working. Replaced with another new relay. Still no work. This leads me to believe something with the ECU? There IS spark, so maybe something else with other electrical sensors? I did a scan and no codes came up either. I'm still baffled.

There IS spark, air, and there are no fuel restriction issues. This is an intermittent problem. Very elusive indeed. Scan tool says it is the FUEL TEMPERATURE SENSOR. A mechanic says there is a SECONDARY FUEL PUMP. Really, where is it? A this point I'm completely baffled. Supposedly the fuel temp sensor is not a discreet replaceable part, and the ENTIRE fuel pump and fuel gauge sender unit Assembly needs to be replaced for $700+ Really? Please any experts here want to give an opinion or bust some myths here?

1998 Legacy Wagon L 2.2 Fuel pump or related electrical problem. note: NOT a clog in the fuel lines or filters already ruled that out. Pulled the pump out and bench tested it: okay it works. Replaced the fuel pump relay: IT WORKED (engine ran) FOR 5 MINUTES, then stopped. Replaced pump relay a second time: nothing. Jumped pin 2-4 at the relay socket (to bypass the relay): no change. Measured 12 volts at the connector to fuel pump (at fuel pump end, in bypass mode) I'm thinking it may be: A bad ground somewhere in the circuit? A short in the wire between the connector and the pump itself? (but why did it work when I replaced the relay the first time?) Here is a clue, when I replaced the pump replay the first time, then it stopped, I felt the relay itself and it felt really warm. Maybe that's normal... Okay, what am I missing or overlooked here?