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Greetings All,
I just purchased a 2000 GL1500 SE from a private seller. with just under 28,000 miles
She started and ran with seemingly no issues when in his carport and on the test ride.
On the way home I stopped at a red light and looked down and saw fuel leaking from the overflow tubes on the right side of the bike.
Once home I shut the bike off and the fuel leak stopped. When I restarted it runs for approx 15 to 20 seconds with no leak but it then starts again.

Where do I start?? Any help would be greatly appreciated

Can't wait for spring!!
 

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Appears the bike has been sitting idle for quite a lot of time. You may have some contamination in the float valve etc., run some fuel cleaner such as Techron (or Sea Foam) through a couple of tanks of fuel. That might clean things up for you. I have know of similar cases....!!
 

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Open the gas door and see if you have a puddle in the Black tray when you start the bike.

A common issue with the 1500's is the Vac petcock auto shut off valve. (Upper right corner)
The diaphragm gets dried out and either leaks air and or fuel into the tray.
Its job to to stop fuel from flooding the carbs after you kill the engine.
A vacuum line from the engine, opens and closes the valve.

If yours is leaking?
K&L has a rebuild kit.
Consisting of the rubber diaphragm's you'll need
 

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Open the gas door and see if you have a puddle in the Black tray when you start the bike.

A common issue with the 1500's is the Vac petcock auto shut off valve. (Upper right corner)
The diaphragm gets dried out and either leaks air and or fuel into the tray.
Its job to to stop fuel from flooding the carbs after you kill the engine.
A vacuum line from the engine, opens and closes the valve.

If yours is leaking?
K&L has a rebuild kit.
Consisting of the rubber diaphragm's you'll need
I agree the petcock is the more likely cause if the bike run well.
 

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Agree on checking the petcock, however when the similar situation occurred on my friends 1997 SE, fuel cleaner resolved the issue.

The bike ran and performed quite well.

I actually observed this happen while on a trip home from Florida....!!

The bike had sat for a period of time prior to the trip....!!
 
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