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rmfitz(at)hughes.net
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 Posted: Sun Jan 07, 2007 1:06 pm Post subject: Gas leak |
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Finally found the source of an intermittent gas smell when fuel started
leaking out of the left wing. There was a 1 1/2" long crack in the
bottom of the tank along side the middle row of rivets. If you smell
gas during acro and/or when the tanks are full this is a good place to
check. It could be why the book says no acro on full tanks.
FWIW: While the tanks were dry I changed the main hoses and cleaned
the fine fuel filter. It took 100 strokes of the primer to get fuel
pressure after filling the left tank. After that, starting and run up
were normal (ran 18min). I can now report that the engine will run with
one tank completely dry on the ground.
I'll let someone else confirm this in the air.
bob
52BN
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PHCarter(at)aol.com
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| Posted: Sun Jan 07, 2007 4:00 pm Post subject: Gas leak |
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Bob
How did you repair the tank? I had this problem 18 months ago and repaired by welding. 6 months ago, the same leak reappeared at the same location. The crack grew straight across the weld (perpendicular) in a slightly different location. Rather then rewelding I tried gas tank epoxy and added a brace between the tank and the wing panel to take the "oil canning" stress off the tank. It has held so far, but from time to time I imagine (falsely) a leak is back. Would like to compare notes on how you repaired crack.
Preston
N6209F
[quote][b]
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yakplt(at)yahoo.com
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| Posted: Sun Jan 07, 2007 5:45 pm Post subject: Gas leak |
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On Aluminum tanks, I highly recommend 8802 fuel sealing compound or the equivalent. I believe Aircraft Spruce sells its. I have been using it on military aircraft fuel leaks since Vietnam and can tell you that it works.... GOOD.
I put some on a crack on the acro fuel tank in my YAK-50 back in 1999. It still is holding perfectly.
Some people will tell you that the only way to repair a tank is by welding. Welding works just fine if you get someone who knows what they are doing, and does not blow out the thin metal used on the Russian tanks (for example). You also must remove the tank and purge it for this type of repair.
Using 8802, you just clean the tank to bare metal, use a preparation etcher fluid, glob it on there, and it's done. 8802 is a two part compound. It dries to a hard rubber feel, not solid. It can flex.
Best of luck,
Mark Bitterlich
N50YK
PHCarter(at)aol.com wrote:
[quote] Bob
How did you repair the tank? I had this problem 18 months ago and repaired by welding. 6 months ago, the same leak reappeared at the same location. The crack grew straight across the weld (perpendicular) in a slightly different location. Rather then rewelding I tried gas tank epoxy and added a brace between the tank and the wing panel to take the "oil canning" stress off the tank. It has held so far, but from time to time I imagine (falsely) a leak is back. Would like to compare notes on how you repaired crack.
Preston
[quote][b]
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rvfltd(at)televar.com
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| Posted: Mon Jan 08, 2007 9:35 am Post subject: Gas leak |
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Mark is spot on about the 8802. I have used it to repair damaged tanks on everything from my 1950 Fergy tractor to a Great Lakes I used to own, good stuff.
Always yakin,
Doug Sapp
Yak Pilot wrote:
[quote] On Aluminum tanks, I highly recommend 8802 fuel sealing compound or the equivalent. I believe Aircraft Spruce sells its. I have been using it on military aircraft fuel leaks since Vietnam and can tell you that it works.... GOOD.
I put some on a crack on the acro fuel tank in my YAK-50 back in 1999. It still is holding perfectly.
Some people will tell you that the only way to repair a tank is by welding. Welding works just fine if you get someone who knows what they are doing, and does not blow out the thin metal used on the Russian tanks (for example). You also must remove the tank and purge it for this type of repair.
Using 8802, you just clean the tank to bare metal, use a preparation etcher fluid, glob it on there, and it's done. 8802 is a two part compound. It dries to a hard rubber feel, not solid. It can flex.
Best of luck,
Mark Bitterlich
N50YK
PHCarter(at)aol.com (PHCarter(at)aol.com) wrote:
| Quote: | Bob
How did you repair the tank? I had this problem 18 months ago and repaired by welding. 6 months ago, the same leak reappeared at the same location. The crack grew straight across the weld (perpendicular) in a slightly different location. Rather then rewelding I tried gas tank epoxy and added a brace between the tank and the wing panel to take the "oil canning" stress off the tank. It has held so far, but from time to time I imagine (falsely) a leak is back. Would like to compare notes on how you repaired crack.
Preston
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[b]
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rmfitz(at)hughes.net
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| Posted: Mon Jan 08, 2007 12:42 pm Post subject: Gas leak |
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Preston,
I took the tank to a welding shop that purged, welded and tested it to
3psi. I installed it and filled with 100LL (w/mmo) leaving the covers
off overnight to check for leaks. I was worried about the hoses and
fittings, not the tank. Next day there was a wet spot on the weld.
Apparently just a pinhole but it wasn't going to get better. I drained
the tank, removed it, cleaned the welded area and sealed it with a 2
part epoxy sealer, 9700 FCR from Diversified Materials Co.
Re-installed, filled and gave it 48 hrs. This time it stayed dry so I
closed up the wing. Time will tell.
bob
52BN
PHCarter(at)aol.com wrote:
| Quote: | Bob
How did you repair the tank? I had this problem 18 months ago and
repaired by welding. 6 months ago, the same leak reappeared at the
same location. The crack grew straight across the weld
(perpendicular) in a slightly different location. Rather then
rewelding I tried gas tank epoxy and added a brace between the tank
and the wing panel to take the "oil canning" stress off the tank. It
has held so far, but from time to time I imagine (falsely) a leak is
back. Would like to compare notes on how you repaired crack.
Preston
N6209F
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