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1981 242 non-turbo. Fuel pump problems. More facts. More questions.
I'm getting a distinct humming noise when the engine is running (and the fan motor is disconnected) is the fuel pump. I hear it at idle and at low speeds. At higher speeds, road and wind noise cover it. Listening with a stethoscope at idle seems to pinpoint the sound to the main fuel pump in front of the tank. The humming noise is loudest through the stethoscope the closer I get to the main pump. It's not as loud at or near the tank. Testing on the tank-to-pump fuel line the noise gets louder the closer I get to the main pump, then tapers off again as I get farther and farther in front of the pump toward the engine. I filled up the tank and I still get this humming noise. Are these symtoms enough to diagnose the problem as the main fuel pump rather than the transfer pump in the tank. They're pretty expensive so I want to be sure.
How long do they typically hum before going out completely? Any danger or added expense in waiting a while to repair? Any information or tips about this would be really appreciated.
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Thanks to everyone for the help, Doug C. 81 242 Brick Off Blocks, stock; 86 240, 129K, once in Rolling, now smashed quarter panel thanks to driver of an F150. Daughter safe in her Volvo.
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