Weird fuel pump noise

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clhiller
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Weird fuel pump noise

#1

Post by clhiller »

Got the '78 out on the road today. It was a winter project. Did all the "musts", timing belts, carb rebuild, water pump, new Dyna S and coils, cleaned the gas tank etc. Took her out for a 10 minute cruise. Ran great, but when I turned it off, I shut off the petcock and about a minute later I could hear a "bubbling" sound. I thought it might be the coolant recovery tank, but it seemed to be coming from the fuel pump. When I open the petcock the sound stops, but when I close it, the sound starts up again in apprx 30 seconds. I disconnected the hose from the pump to the carbs and there was a lot of pressure there even without the engine running. Is that normal?
Any ideas?
1978 GL1000
1966 CB77 Superhawk
1964 CA77 Dream
1956 BSA Golden Flash
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CYBORG
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Re: Weird fuel pump noise

#2

Post by CYBORG »

Not normal. The vent in the gas cap is plugged. Clean or replace the gas cap. If it does it again, loosen the fuel cap and see if the pressure is relieved
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
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robin1731
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Re: Weird fuel pump noise

#3

Post by robin1731 »

Remember, the vent is one way. It allows air in to the tank but not out. So the tank can build pressure while sitting. Especially with a warm engine under it.

.
1976 Goldwing Super Sport
1985 Honda Elite
1976 KZ900 Dragbike
1992 ZX7 Dragbike (KZ900 style motor w/NOS)
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CYBORG
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Re: Weird fuel pump noise

#4

Post by CYBORG »

robin1731 wrote:Remember, the vent is one way. It allows air in to the tank but not out. So the tank can build pressure while sitting. Especially with a warm engine under it.

.
So true. Even when out in the hot sun. Wasn't thinking. Would create a vacuum if plugged.
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200
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Rat
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Re: Weird fuel pump noise

#5

Post by Rat »

Yeah .... sometimes you hear a'whoosh' when you undo the cap and it's easy to think the air is rushing in ....

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Track T 2411
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Re: Weird fuel pump noise

#6

Post by Track T 2411 »

Hmmm... usually when I had a whoosh, it's the wind blowing in one ear and out the other... :roll: :roll: :roll:
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