Weird fuel pump noise


Information and questions on GL1000 Goldwings (1975-1979)
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clhiller
Posts: 7
Joined: Fri Jul 06, 2018 9:48 pm
Location: Leduc, Alberta
Motorcycle: 1978 GL1000 Goldwing

Weird fuel pump noise

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?


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DenverWinger
Posts: 1708
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Weird fuel pump noise

Post by DenverWinger »

Warmed fuel built up some pressure in the fuel tank.

The gas cap is supposed to vent excess pressure or vacuum, it might have become clogged. Try soaking the fuel cap in Seafoam for 24 hrs.... Bet that fixes it.
♫ 99 Little Bugs in the Code, ♪
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SnoBrdr
Posts: 784
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

131K Original Owner

Re: Weird fuel pump noise

Post by SnoBrdr »

DenverWinger wrote: Tue Apr 23, 2019 5:22 pm Warmed fuel built up some pressure in the fuel tank.

The gas cap is supposed to vent excess pressure or vacuum, it might have become clogged. Try soaking the fuel cap in Seafoam for 24 hrs.... Bet that fixes it.
Vinegar is cheaper.
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