Noise from fuel pump

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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CAV pilot
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Noise from fuel pump

Post by CAV pilot » Wed Mar 07, 2018 11:32 am

The last few times I have started my 68 A1 I get a constant tapping/ knocking noise from my in tank fuel pump. Any ideas or is the pump telling me it is ready to check out. Thanks in advance.


Pops506th
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Re: Noise from fuel pump

Post by Pops506th » Wed Mar 07, 2018 2:32 pm

Does it happen when you turn the switch on? As in before the engine starts?

It makes a tapping noise during normal operation. You normally don't hear it when the ign switch is turned on because of the oil pressure safety switch. If the fuel pump is running without the engine running, the oil pressure safety switch isn't working properly.
1985 M1010
1986 M1009
1962 Ford M151A1
1967 Stevens M416 Trailer

CAV pilot
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Re: Noise from fuel pump

Post by CAV pilot » Wed Mar 07, 2018 2:59 pm

When I turn switch on all quiet engine starts right up then the the tapping starts. Turn engine off all quiet on the western front as they say.

Rickf
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Re: Noise from fuel pump

Post by Rickf » Fri Mar 09, 2018 4:00 pm

Perfectly normal, That is how you know it is working. :D
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
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