Black Fuel in Tank - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-24-2009, 09:47 AM   #11
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Re: Black Fuel in Tank

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Originally Posted by bbbair View Post
Hmmm - It almost sounds as if you are getting some residue from the exhaust via the back pressure line.

Is the engine producing a lot of smoke?

You could put a line filter in the back pressure line to stop any large "Chunks" of carbon from getting to the fuel tank. However, this won't stop the production of carbon - check the tuning.

Good Luck!
I agree with this assessment.....likely the cause from my experience a lifetime ago in my glow days......
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Old 05-24-2009, 08:58 PM   #12
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Re: Black Fuel in Tank

Same here. I ran a filter in the pressure line to cut down on the carbon going into the tank.
Tried for my kamikazi pilots licence. Flunked the test.
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Old 05-24-2009, 11:40 PM   #13
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Re: Black Fuel in Tank

The stopper is good, not gummy, soft or missing chunks. But yes you were right about the smoke part, there very little if any, which means tuning. I'm bad tuning by listening not watching, tuned til it ran at the highest rpm (too lean of course), watched for smoke, none, did line pinch test just kept running, didn't gain rpms and sputter like it should, so backed off the high speed, did the proper tests - look & listen ..ran the plane for darn nears half tank, and guess what no black fuel...just goes to prove, that the proper way is the best way. And I think I will try lesser nitro. And hopefully I will see some of you at the provincial fun fly in June in Saskatoon (if my maac gets here on time...) Thanks for all the suggestions, totally awesome
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Old 05-25-2009, 04:01 PM   #14
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Re: Black Fuel in Tank

If the stopper is good, then the culprit is dirty fuel residue being forced into the tank via the pressure fitting.

1] Overheated engine is burning your fuel residue
2] Loose muffler fittings

If your fuel residue is black when you wipe off your plane, that is a sure sign you are either burning the oil (from running too hot) or have metal to metal vibration somewhere on your muffler/engin connection (or the muffler itself if it is a 2 piece muffler)

Run the engine richer and see if your fuel wipes off clear. If it clears up, you are good to go. If still dark, you should suspect metal/metal vibration
Make sure nothing is lose where the muffler connects to the engine.

If you have a multi-piece muffler, you have more opportunities to have metal to metal vibration (Might 'seem' tight but you can stil have micro-oscillations) that causes your fuel residue to appear black when you wipe it off the plane.

-run engine richer (if you suspect burning your oil residue)
-Make sure everything is tight
-plave a card-stock gasket between the engine and muffler.
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