Odd problem


Information and questions on GL1000 Goldwings (1975-1979)
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PoolDude
Posts: 75
Joined: Tue Aug 20, 2013 5:05 pm
Location: Phoenix, Arizona
Motorcycle: 1975 GL1000

Odd problem

Postby PoolDude » Thu Apr 23, 2015 12:11 am



Has anyone ever had an issue with an air leak at the petcock? I had converted my GL1000 to an electric fuel pump a few years ago and installed a rather large, clear fuel filter at the same time. Lately I have noticed air bubbles coming into the filter with it becoming more pronounced as the fuel level drops. Tbis even happens when the tank is full and the petcock and internal plumbing is below fuel level. I've checked all the clamps and can't find any fuel leaks. Any ideas would be appreciated.



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seelyark1
Posts: 465
Joined: Sun May 27, 2012 1:57 pm
Location: Dunnellon, Florida
Motorcycle: 2000 GL1500 SE
1998 GL1500 SE Totaled
1984 VT500C
1967 CB550-4

Re: Odd problem

Postby seelyark1 » Thu Apr 23, 2015 10:38 pm

Is your fuel pump before or after the filter? If it is after the filter, you may be pulling a vacuum on the filter so it looks like air bubbles but actually isn't. Vacuum still looks like air but isn't actually. :) Now, How do you explain this one :roll: Just know it happens but can't explain it better. :roll:
Ride safe, and smart. Asphalt is like #1 grit sandpaper. Dave

User avatar
PoolDude
Posts: 75
Joined: Tue Aug 20, 2013 5:05 pm
Location: Phoenix, Arizona
Motorcycle: 1975 GL1000

Re: Odd problem

Postby PoolDude » Fri Apr 24, 2015 12:23 am

Fuel filter after the pump, I had already thought of bubbles from vacuum. I'm also wondering if the leak is in the pump. I'll siphon the tank down and pull the petcock off tomorrow.

User avatar
seelyark1
Posts: 465
Joined: Sun May 27, 2012 1:57 pm
Location: Dunnellon, Florida
Motorcycle: 2000 GL1500 SE
1998 GL1500 SE Totaled
1984 VT500C
1967 CB550-4

Re: Odd problem

Postby seelyark1 » Fri Apr 24, 2015 5:42 am

The fuel pump has to be the cause of it then. But it is strange that it doesn't leak fuel. Have you tried leaving the petcock open to see if it does leak? The fuel pmp should cause a vacuum, or at least a low pressure, but the system is under gravity pressure if the pump is not running. Does your fuel tank have a vacuum when you open the cap? Venting correctly? Think the petcock has an o-ring for a seal to the tank and it is possible for vacuum to suck air past it and not leak fuel when not running. Your right, odd problem. :? Not real familiar with the 1100s but the theory is the same. ;)


Ride safe, and smart. Asphalt is like #1 grit sandpaper. Dave


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