Auto Fuel Tap

[Patspiercing]

Hi,
I have just inherited a 1990 Gl1500 which has not been on the road for a few years.
I have managed to get it running and rode it home by bypassing the Auto Fuel Tap as it was leaking fuel.
I have stripped the tap and resealed the joints and checked the diaphragm and that was ok.
On putting it back on the bike fuel spurts out from a small hole just above the main fuel outlet.
I have attached a photo showing the small hole.

Any thoughts on why it is doing this and how do I cure it?
What is the hole for?
Can I just block it up?

All thoughts appreciated

Thanks

[Andy Cote]

Welcome to the forum.

The vent hole is necessary for operation. The fuel coming from the vent hole is likely due to a leaking diaphragm. A rebuild kit for the vacuum operated fuel petcock is available. You could also replace the entire unit.

You can run the bike without the petcock. Realize that doing this should only be an emergency type solution as whenever the key is on, even if engine is not running, the electric fuel pump will be pushing gasoline in to the carburetors.

[FM-USA]

Actually had that happen on reassembly.
Found the diaphragm edge didn't stay put.

I'm with Andy on getting a rebuild kit, at least have it handy.

Those don't last much longer than 100K miles IF there's water that sits (bottom) wears it thin in 'freeze-thaw' scenario.
If you have the patience, extending the life by rotating it every 2 years or so (temp depending) should last longer.
The price of new vs labor worth it?

.

[Patspiercing]

Thanks lads,

I looked on the Fowlers UK website and it said that rebuild kits were not available and a new tap was about £350. That is why I was reluctant to change it.

However with your advice I have found a kit on eBay France for 17.50 Euros including delivery. So I have ordered it.

Thanks