Electrical Fuel System Prolems. Stumped Please Help!!

89LX50Coupe · 06-09-2001, 11:28 AM

I am not tottally positive that the injectors are injecting fuel, but that is what it sounds like. Kindof a little hissing noise coming from the motor. I was thinking that it might be that the fuel pump had shorted out, but if the fuel just kept running, would it really hurt anything. The FPR is new, so when the fuel lines reached 40 psi or whatever, wouldn't the FPR just send the fuel back to the tank? Plus, once the motor is on, doesn't the fuel pump run constantly. I let it set at an idle for 5 minutes or so too see if it would burn up the fuel and run ok, but it wouldn't. Could the ECU cause the injector to stay open, if th ECU was burned up. If the injectors stay open, then the fuel pump could not build up any pressure, and it would just keep running. I'm fairly new to cars, I'm only 18, so this is just a theory. But I asked everyone that walked in to the autoparts store all day, and no one had a clue! Including a couple mechanics. I think you may be right about taking it to a shop! I am really running out of patients. I am going to try a new ECU & check that fuel pump relay first though. You also said something about a test lead that might keep the fuel pump running, wheres it that located? Thanks alot!

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06-09-2001, 11:28 AM	#1
89LX50Coupe Registered Member Join Date: Jun 2001 Location: Conway, Ar, USA Posts: 9	I am not tottally positive that the injectors are injecting fuel, but that is what it sounds like. Kindof a little hissing noise coming from the motor. I was thinking that it might be that the fuel pump had shorted out, but if the fuel just kept running, would it really hurt anything. The FPR is new, so when the fuel lines reached 40 psi or whatever, wouldn't the FPR just send the fuel back to the tank? Plus, once the motor is on, doesn't the fuel pump run constantly. I let it set at an idle for 5 minutes or so too see if it would burn up the fuel and run ok, but it wouldn't. Could the ECU cause the injector to stay open, if th ECU was burned up. If the injectors stay open, then the fuel pump could not build up any pressure, and it would just keep running. I'm fairly new to cars, I'm only 18, so this is just a theory. But I asked everyone that walked in to the autoparts store all day, and no one had a clue! Including a couple mechanics. I think you may be right about taking it to a shop! I am really running out of patients. I am going to try a new ECU & check that fuel pump relay first though. You also said something about a test lead that might keep the fuel pump running, wheres it that located? Thanks alot!