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1. 07:33 AM - Fuel leak at the Main Tank Drain ()
2. 08:06 PM - Re: Fuel leak at the Main Tank Drain (Roger Lee)
Message 1
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| Subject: | Fuel leak at the Main Tank Drain |
The other day I drained the main fuel tank on my Allegro 2000 in order to
remove and clean the gascolator which is between the electric fuel pump and
the engine. The drain consists of two items, the first being a small
threaded brass plug with a point which is removed with a flat head
screwdriver. This brass plug screws into a separate larger female/male brass
fitting which in turn screws into the bottom of the tank itself. The male
part of the larger fitting that screws into the tank has a metal washer
which compresses on to the bottom of the tank for the seal. I initially
removed the smaller pointed brass plug, but the draining was so slow that I
then removed the larger brass fitting with the metal washer. The fuel
quickly drained after removing the larger fitting. The reason that the fuel
was draining so slow through the smaller opening was that some debris had
partially clogged the outlet.
After draining the tank and removing and cleaning the gascolator filter, I
reassembled everything and partially filled the main tank and ran the engine
for a short time. After shutting down the engine I checked for any fuel
leaks at the gascolator and the main tank drain. I found that the main tank
drain had a slow drip leak. I have checked the fuel at the drain point many
times by loosening the small brass plug which has a point on it, and
retightening it afterwards with no fuel leaking, so I am sure the leak is
not at that point. I am convinced the fuel leak is from the larger fitting
(that has the metal seal washer) that screws into the bottom of the tank
itself. The slow leak is either coming through the flat contact surface
between the top of the metal seal washer and the tank itself, or between the
flat bottom of the metal seal washer and the fitting itself. I have
tightened this fitting as much as I feel it is safe to do so. Does anyone
have any suggestions on how to stop this slow drip leak?
Hugh McKay
Allegro 2000
Rotax 912 UL
Message 2
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| Subject: | Re: Fuel leak at the Main Tank Drain |
Hi Hugh,
Use a little Loctite 574 on both sides of the washer. Use very little . The leak
will stop. This is good for oil leaks between metal surfaces, gaskets or "O"
rings that just won't seal. You don't need a lot. I use it on the Rotax 912 valve
covers when you can't get them to stop oozing oil even when a new "O" ring
is installed.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
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