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Home✈️Aircraft🚁HelicopterBeginners Corner › Importance of Nitro Fuel Pickup Line Inside Tank
04-22-2016 12:05 PM  4 years ago
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jackp332

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Claremont, Nh USA

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Importance of Nitro Fuel Pickup Line Inside Tank
I just wanted to share an experience from last night for all the new-to-nitro guys who might not be aware of the importance of replacing your in-tank fuel pickup lines regularly. These lines will degrade every few gallons of fuel or so, break off inside the tank, and leave you in a motor out situation mid air with a tank still half full of fuel.
Last night I was flying my trusty Raptor that had been stored since last fall (and flown alot last season). I gave it a good check over before heading to the field and was confident everything was in order. I flew 3 good flights and all went well. It felt great to be back out again and my confidence was building. For my last flight I started shooting some autos to end my session. As a common practice, each time I land and take off into a hover again, I fly in front of myself and visually check the fuel level in my MAIN tank. I had been flying quite a while and I did notice the motor surging a bit on my last hard ascent to auto-altitude but figured it was just working out some 'storage cobwebs'. (Please don't ever assume this as I did with my over - confidence) Anyways, after I landed the auto I figured "Just 1 more and we will call it a day!" As I hovered in front of myself and observed a 1/4 tank of fuel in my MAIN tank still I thought, "wow I should be almost out by now".... As I was about to turn out and ascend hard I noticed my HEADER tank was almost bone dry. Crap! I knew immediately what the surging was (the engine was sucking air through the pickup line and about to run out of fuel from the header tank) and landed asap. Upon inspection at home my suspicion was confirmed as I found the pickup line in my MAIN tank was degraded and broke off, thus leaving the 1/4 tank of fuel still while my engine burned up what was in the header tank.
This is common knowledge for experienced guys but often overlooked by beginners. Guys, if you have a few gallons through that new nitro heli or its been stored for a while- replace those lines! Happy flying
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04-22-2016 11:50 PM  4 years ago
don s

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Chesapeake, VA

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Storing the tank full helps the tubing last a little longer.E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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04-22-2016 11:56 PM  4 years ago
jackp332

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Claremont, Nh USA

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Interesting- I would never have thought to do that. One pilot at my field swears by filling the tank completely when done for the day, then draining the tank for storage. He says this purges it of the exhaust gasses...
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04-23-2016 12:00 AM  4 years ago
don s

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Chesapeake, VA

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purges it of the exhaust gasses...
Yep. That's what kills the tubing.
E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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04-23-2016 02:11 AM  4 years ago
ICUR1-2

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Ottawa, Ontario

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that over confidence/assumption is what will get you every time.

I store with a full tank,the lines will last for years.
never dry store ! if you're using exhaust pressure.

burnt fuel produces nitric acid

how's that for a psm
spending time, paying attention
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04-23-2016 02:17 AM  4 years ago
Steve Graham

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Denver, CO

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I guess this is one of those YMMV things. I run a pressurized system, OS 105 HZ-R, so there is never any burned fumes in my tank. I keep my tank full to keep the lines inside and the rubber bung in good shape. I still find I need to replace the lines inside the tank probably about twice a year or they begin to turn to jelly/rot out and fall off the barbs.
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04-23-2016 02:23 AM  4 years ago
ICUR1-2

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Ottawa, Ontario

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good point about the YMMV
guess it will depend on usage as well, I take it you fly often ?
spending time, paying attention
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04-23-2016 02:40 PM  4 years ago
don s

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Chesapeake, VA

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I need to replace the lines inside the tank probably about twice a year
Brand?
E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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04-23-2016 04:55 PM  4 years ago
Steve Graham

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Denver, CO

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The Lynx thin designed for use with the MOAS. I'm sure the thin does wear out quicker. Even the thicker lines on my fuel jug and external carb plumbing slowly degrade over time though. Lately I've used a thicker tubing that is still flexible, just not as much as the Lynx. It does seem to last longer and doesn't appear to affect the functioning of the MOAS. I believe once the felt is full of fuel it has enough weight to sweep the tank even with slightly stiffer line.

I think the original point stands. Make sure your internal fuel lines are in good shape. The only way to really do that is to take them out of the tank. At that point it's cheap insurance to just replace them.
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04-23-2016 07:47 PM  4 years ago
artimus

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Buckley WA

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When I fill the tank after the last flight to get the exhust gasses out of the tank , I pull the pressure line off the muffler so I DONT load the muffler with the gasses your trying to get rid of. Then just draw it back in when you empty the the tank for storage. You get fresh air in the tank and the tubing last much longer....Fly Hard......Team Viagra
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04-23-2016 08:36 PM  4 years ago
jackp332

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Claremont, Nh USA

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That's a very good idea.
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04-25-2016 01:51 AM  4 years ago
martinrcnitro

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Mirabel, Quebec, Canada

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good thingsNitro Flyers
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04-25-2016 05:05 PM  4 years ago
artimus

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Buckley WA

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Once I had a engine lean out then settled down then lean out again...thought a glow plug was going....truned out it was a pinhole in the clunck line.
The Engine lean out in flight is more than likely is from a crack in fuel tubing sucking air and will come and go when fuel covers the hole in the line. After that I back blow some air into the tank from the line the goes to the carb to see if any bubbles show up in the tank. Some simple checks and matinance can save you a lot of headaches.
Fly Hard......Team Viagra
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11-21-2016 07:24 PM  3 years ago
Richardmid1

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Leeds, England

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I have always left the tank full, I have never had to change the fuel line in 12 years... But then I have never kept a heli longer than about 3 years. Haha60% of the time, it works every time!
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11-29-2016 03:03 AM  3 years ago
Rockin Bird

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St Gabriel, La

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old fuel lines
Thanks for the info,its been aleast a year with no fuel in all of my nitro tanks.Time to re-group.
That sweet smell of "Nitro"
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03-23-2017 12:00 AM  3 years ago
DUCDOC

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Omaha

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I change out my fuel lines every season. I tend to burn somewhere between 10 and 15 cases of fuel per season at 4 gallons per case. As long as you store the tank full of fuel the lines should last an entire season of flying.Gabriel Sandoval Synergy Field Rep. Rail Blades, Scorpion Power,Team JR
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