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03-05-2015, 07:02 PM | #1 |
Senior Member
Join Date: Jan 2013
Location: Bend, Oregon
Posts: 514
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Fuel pump clicking
Just back from a test run to check for leaks after replacing my water pumps and thermostats. Everything looks good with that. I parked in the garage and went in and had a cup of coffee and when I went back out to the garage I heard a clicking noise coming from the engine compartment. I open the hood and used my stethoscope to locate the noise. It was my mechanical fuel pump making a medium rate rhythmic low tone series of clicks. Four or five clicks a very short break then four or five more. It kept this up for a few minutes. Never heard this before and I'm not sure what it means. Any ideas?
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03-05-2015, 07:37 PM | #2 |
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Join Date: Sep 2014
Location: oroville calif
Posts: 893
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Re: Fuel pump clicking
my guess is either the fuel pump rod is to short and causing the click as it hits the fuel pump arm, or the shaft pin holding the arm to the pump is worn and causing the click as the fuel pump lobe raises the arm on pump
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03-05-2015, 07:41 PM | #3 |
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Join Date: May 2010
Location: Ft Mohave,Az
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Re: Fuel pump clicking
I'm assuming the engine is off so that is probably the fuel leaking back into the tank.
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03-05-2015, 07:45 PM | #4 |
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Join Date: Sep 2014
Location: oroville calif
Posts: 893
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Re: Fuel pump clicking
LOL, B.O.B. that never occurred to me, leave it to me to do things the hard way, don't think about the easy explanations
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03-05-2015, 09:17 PM | #5 | |
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Join Date: Jan 2013
Location: Bend, Oregon
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Re: Fuel pump clicking
Quote:
Thanks for your input. |
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03-05-2015, 10:43 PM | #6 |
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Join Date: Jul 2011
Location: SF Bay Area
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Re: Fuel pump clicking
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Elementary, my dear Watson.
__________________
Alan |
03-06-2015, 11:41 AM | #7 | |
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Join Date: Jan 2013
Location: Bend, Oregon
Posts: 514
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Re: Fuel pump clicking
Quote:
Alan or should I say Holmes THANKS, I believe you may be on to something there. Hadn't thought about vapor pressure although I should have as I do have a small vapor lock problem on hot days when I shut the engine off and don't open the hood. While it is not a major problem, just a minor irritation, I'm still looking for a solution to the vapor lock problem other than leaving the hood open when stopped. Who has more fun than flathead owners. Answer no one!!! |
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03-10-2015, 12:30 PM | #8 |
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Join Date: May 2010
Location: Now in Wichita, KS
Posts: 251
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Re: Fuel pump clicking
I had to add a thermal spacer (I think I got mine from Dick Spadaro) between my carb and manifold on my '39 as the fuel in the carb bowl would boil when I shut the engine down. I could hear the bubbling and the increase in pressure would force the expanding fuel out through the idle jets. As the engine cooled down, the fuel would stop boiling but this would leave the carb bowl near empty and I could see fuel pooling on top of the throttle plates. This would cause problems starting (low fuel bowl supply and flooded cylinders).
The spacer eliminated this problem and minimized carb-related vaopr lock but I still have vapor lock issues in the lines/pump. When able, I use non-ethanol fuel. The ethanol in the fuel has a lower boiling point than gasoline is likely a contributor to this boiling fuel phenomenon. Dan |
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