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post #1 of Old 05-20-2015 Thread Starter
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Fuel Pump Noise

So I'm new to having a diesel and I wondered the other day why my fuel pump continues to "purr" along with the ignition on, but the engine not yet started. It's a 1987 Catalina 30 and everything is in good order. The valve on the fuel return to the tank is closed so I figured that the pump would pump until it came up to pressure and then stop - kind of like my old 1967 MG Midget where I would listen for the pump to purr and then stop before I started the engine.

So am I just needing to get used to the purr continuing or should it actually stop? I'm wondering if the pump is starting to reach its life's end.

Oh, one other thing. When I open the fuel return valve the pump speeds up so I know that the fuel is running back to the tank. The engine runs fine by the way. I've replace the fuel lines last fall and everything went fine. I was getting ready to replace the filters this spring when I noticed the continuing noise and I can't remember if it was always there.

Any ideas?


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Last edited by BristolTucker; 05-20-2015 at 09:21 AM.
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