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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Sat Aug 09, 2008 11:47 am Post subject: Fuel Cap Leak |
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Gentlemen:
I have an Allegro 2000, and am experiencing some fuel leakage out of the
main belly tank fuel cap (Plug). I believe the fuel is leaking out of the
key slot where you lock the fuel cap. At least the indication is that it is
coming from the key slot. There are streaks of fuel stain along the side of
the fuselage, and the source is clearly coming from the key slot. When the
cap is in place, closed and locked, the orientation of the key slot is at
three o'clock, and the plastic tab that rotates is at nine o'clock. Can some
one tell me if they have had a problem like this? Could I have the cap
itself rotated to the wrong position (i.e. is the key slot suppose to be at
a different position on the clock when the cap is in place and closed?
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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splashlanding(at)comcast.
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| Posted: Sat Aug 09, 2008 3:08 pm Post subject: Fuel Cap Leak |
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Hugh,
I have a 2006 Allegro 2000 and had the same cap leakage problem. I ended up sealing the keyhole with form a gasket and it leaked only a tiny bit afterward and then has sealed itself for good. Aircraft Spruce offers the same cap without the lock if you want to spend the money.
I am having problems with the fuel tank bleeder on the belly of the plane. It keeps getting clogged with large black particles (nearly every time I check the fuel for water). I can't figure out where they are coming from, but have to remove the mechanism and blow it out each time because it won't spring back up and seal. I thought it might be the black silicone the fuel level sensor is held in with, but after removing the remainder of that material I'm still getting particles. By the way, I flushed the tank twice before filling the first time and have checked the fuel cans as well. Incidently, I have changed the o ring to the latest version and can see that it is still in good shape. Any ideas???
Dale Hackworth
2006 Allegro 2000 Amphib
N306AD
Hobe Sound, FL
[quote][b]
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Sat Aug 09, 2008 4:24 pm Post subject: Fuel Cap Leak |
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Dale:
Do I understand you just forgot about locking the fuel cap and completely sealed the key hole? If you did what did you use to seal it with that would not deteriate from coming in contact with gasoline? Is “Form a Gasket” a material? Please explain this in more detail.
I understand the fiberglass belly tank of the Allegro is coated, or “lined” inside with some type of material to prevent the fuel from coming in contact with the fiberglass itself. The black material may be part of this lining. I am guessing, but that is all I can think of at this point. I hope it is not the lining, because I don’t know how one would fix that type problem. Have you asked The US Distributor if this has ever occurred before? However, based on my experience with them, you won’t get an answer.
Hugh McKay
From: owner-allegro-list-server(at)matronics.com [mailto:owner-allegro-list-server(at)matronics.com] On Behalf Of Amy Hackworth
Sent: Saturday, August 09, 2008 7:08 PM
To: allegro-list(at)matronics.com
Subject: Fuel Cap Leak
Hugh,
I have a 2006 Allegro 2000 and had the same cap leakage problem. I ended up sealing the keyhole with form a gasket and it leaked only a tiny bit afterward and then has sealed itself for good. Aircraft Spruce offers the same cap without the lock if you want to spend the money.
I am having problems with the fuel tank bleeder on the belly of the plane. It keeps getting clogged with large black particles (nearly every time I check the fuel for water). I can't figure out where they are coming from, but have to remove the mechanism and blow it out each time because it won't spring back up and seal. I thought it might be the black silicone the fuel level sensor is held in with, but after removing the remainder of that material I'm still getting particles. By the way, I flushed the tank twice before filling the first time and have checked the fuel cans as well. Incidently, I have changed the o ring to the latest version and can see that it is still in good shape. Any ideas???
Dale Hackworth
2006 Allegro 2000 Amphib
N306AD
Hobe Sound, FL
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Sun Aug 10, 2008 2:46 am Post subject: Re: Fuel Cap Leak |
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The fuel pickup tube and the finger strainer has a black colored sealant around it where it penetrates the tank. That is the stuff you are probably seeing. Ours did the same thing for quite a while but finally quit when it ran out of loose material sloughing off. When taking a sample from the sump to test for fuel contamination you can mitigate the problem by making sure you open it wide and quickly draining out a good bit of fuel and then closing it quickly. This ensures the flow rate is maximum which tends to flush out the black stuff that has settled in the sump cup.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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Threadcharmer(at)cs.com
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| Posted: Wed Aug 13, 2008 10:01 am Post subject: Fuel Cap Leak |
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Hey Hugh,
The substance I used to seal my fuel cap is Permatex 2 Form A Gasket Sealant. Another item I keep in my hangar is that putty type epoxy that you knead with your fingers. I think that would work just as well. Hope one of these works for you.
Dale Hackworth
2006 Allegro 2000 Amphib
N306AD [quote][b]
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