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Old 01-16-2006, 03:25 PM   #1
gotawd
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Default bad fuel pump?

is there anyway to check to see if a fuel pump went bad? does it run off of 12v becaue if so i was just goin to plug it up directly to the battery to see if it atlest came on and the motor wasnt bad. i took it outa the tank just to make sure all the connections looked fine and which they did. i keep blowing the fuse as soon as try to start my car and im thinkin the motor in the pump might of went bad. or does anyone know the resistance of the fuel pump so i can jsut check it with a multimeter. its a walbro pump

tyler
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Old 01-17-2006, 08:11 AM   #2
ride5000
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tyler, if you can wait till this evening i can test the coil resistance of a spare walbro i have.

in the meantime, replace the fuse and apply ignition power to the car with no fuel pump installed. make sure there are NO FUMES in or around the car--it would be best to replace the fuel pump/level/pickup assembly on the tank. if the fuse blows you know it's your wiring or your fuel pump controller. if it doesn't you can be pretty sure it's the pump.
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Old 01-18-2006, 03:14 AM   #3
sixpack subaru
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The fuel pump will only run while it receiving a signal from the Crank sensor.
Or for approx 1.5 seconds when Ignition is switched on.
Connect the 'D' check connector, (Green), and the pump will cycle at 1.5 second cycles for you to test. The std pump runs a resistance of 1.3Ohms across the pump terminals 1 and 4.
Hope this helps
Sixpack
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Old 01-19-2006, 03:57 PM   #4
gotawd
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well i took out my pump and checked the conections, checked my controller and rely and pluged them all back in and now it wont prime but it also wont blow the fuse. i have no idea what the problem could be. i first underhooked the pump rely just to see if it would blow the fuse still and it didnt and i pluged it and the controller back in and it still doesnt blow it it just doesnt do anything. no priming or anything.
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Old 01-20-2006, 06:41 PM   #5
sixpack subaru
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Sounds like a pump to me, although I am not familliar with Walbro units......
Didn't someone say they could get the resistance specs for the pump motor for you?
Sixpack
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Old 01-21-2006, 09:02 AM   #6
ride5000
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the oem pump measures 4.63 ohms across the terminals.

the walbro gss342 measures 0.95 ohms across the terminals.

both pumps measure infinite resistance from either terminal to pump housing.

hth
ken
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