92 NH fuel Tee O-rings

[Pete in PA]

This is on my 92 NH 750.  I got the 4 carb. rebuild kit, only used the new O-rings.

Kit has the o-rings for the 2 small fuel tubes but not for the fuel Tee in the middle. They need to be bigger or thicker.

This was an after market kit, have many o-rings left over but not the right ones for the Tee.

Are these included in the K&L kits?

Will I be able to get the right size at a hardware store?

Thanks!

[mollusc]

Harbor Freight sells kits of mixed sizes that should have something that will work.  Pretty reasonable price too, as I recall.

[draser]

I used 1.78mm x 7.65mm from The O-Ring Store, PN N1.78x007.65.

[Pete in PA]

Thanks for the replies.

I picked up a metric O-ring kit at Auto Zone.  We have one 7 miles away.

Closest Harbor Freight is 30 miles away. We're a bit rural here, I like it that way.

Carbs are together and fuel tight (bench test)

1 question...What is the pressure of 5 gallons of gravity fed gas in PSI??

[DesertDragon]

"1 question...What is the pressure of 5 gallons of gravity fed gas in PSI??"

A fraction of a psi at most and the pressure will vary by the height of fluid (gasoline) in the tank.

[Bob H]

...A fraction of a psi at most and the pressure will vary by the height of fluid (gasoline) in the tank.

It can still leak, despite low pressure.
When I work out of town for 6 months, every time I come back home my carbs would leak, but only the first few days. The first time this happened I pulled the carbs, changed the float needles (old ones looked fine - new ones in - still leaking gas). It was puzzling, because after about 3 days the leak "healed" and stopped.
this happened 4 years in a row, whenever I put gas back in the bike. Finally I realized it leaked where that tube connects the carbs. I have not pulled them apart yet, because I am back home without draining the carbs and it doesn't leak if they don't dry out.
My petcock started leaking this year, when I pulled it I discovered the o-ring at connection to tank was completely flattened. They sell aftermarket petcock on Amazon for about $25, came with o-ring, which completely stopped the leak. Fuel leaks are no joke...

[Pete in PA]

My fuel tube O-rings were definitely the origionals.  Should be good for another 30 years.

You can get the full rubber rebuild kit for the petcock on Ebay.

I was surprised mine worked 100% correctly when I checked it.

[DesertDragon]

...A fraction of a psi at most and the pressure will vary by the height of fluid (gasoline) in the tank.

It can still leak, despite low pressure.

You asked about fuel pressure, not about how much pressure can cause a leak..

The 'Hawk has a diaphragm which is supposed to stop fuel delivery unless the engine provides vacuum, regardless of the petcock position. That's why there is a hose from the petcock that goes to an intake port. 

Anyone who has an engine off fuel leak on a 91-03 Nighthawk has a petcock problem, and if there is a bad hose or a problem with the carb floats, a fuel leak results.

[Bob H]

Yep, it only leaked when started up (not 24-7).