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?
Weird fuel pump noise
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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
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.
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, ♪
♪ 99 Bugs in the Code. ♫
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪
~Mark
♪ 99 Bugs in the Code. ♫
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪
~Mark
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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
Vinegar is cheaper.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.