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01-25-2015 01:04 PM  3 years agoPost 1
mustang67ford

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Central Pennsylvania

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I understand the purpose of the vent line loop. I currently have it looped into the air above my fuel tank. Is it possible to lay the loop flat and strap it to the top of my fuel tank?

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01-25-2015 01:20 PM  3 years agoPost 2
Mark Dean

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Maryland

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Yes
In my experience, it works just as well. I tried it due to the fact that we always run in on planks that way. Both of my Bergen helis are set up this way with no issues.

Mark

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01-25-2015 02:01 PM  3 years agoPost 3
mustang67ford

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Central Pennsylvania

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Cool, thanks. You have a pic?

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01-25-2015 03:23 PM  3 years agoPost 4
fastflyer20

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N. Tonawanda, NY

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No matter how it is done, make sure you use large fuel line and the line does not get partially pinched/collapsed. I have seen it happen a few times and makes for some fun trouble shooting!

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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01-25-2015 10:52 PM  3 years agoPost 5
Mark Dean

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Maryland

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Here's the pic

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01-25-2015 11:04 PM  3 years agoPost 6
mustang67ford

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Central Pennsylvania

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Thanks for the pic. Mine comes out of the tank top the same way. I'll have to velcro it down or tape it; nothing to tiewrap to.

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01-25-2015 11:51 PM  3 years agoPost 7
jackp332

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Claremont, Nh USA

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Yes, this is the way I have done both of my Helibug Raptors and I have had no issues. Notice there is a loop of velcro Under the vent tubing- this is firmly holding the tank in place. Then a second strip was added, directly over the first, just to hold the vent tubing gently as not to restrict it.

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01-25-2015 11:54 PM  3 years agoPost 8
rocket_33

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Mount Pleasant, Michigan USA

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What is the purpose for the loop on the vent line?

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01-25-2015 11:59 PM  3 years agoPost 9
jackp332

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Claremont, Nh USA

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When you go inverted it will keep your gas from simply draining out. The idea is it will flow back into the tank once you are in upright orientation again.

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01-26-2015 12:36 AM  3 years agoPost 10
Mark Dean

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Maryland

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Excellent Jack
Exactly like a plank tank!

Mark

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01-26-2015 01:29 AM  3 years agoPost 11
JEEPWORLD2002/2

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Blue Bell, Pa

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Couldn't you just use a one way valve to prevent feed back but still allow a in flow ??

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01-26-2015 01:44 AM  3 years agoPost 12
geomecc

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Long Island ,NY

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one way check valves get stuck. no good when it happens in flight

R I P Roman Jr. Team SKOOKUM SRW EFC

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01-26-2015 02:28 AM  3 years agoPost 13
RM3

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Killeen, Texas - USA

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I will add that a check valve in the vent line causes reliability issues with walbro carbs over time. the valves can induce high pressure in the tank and stress the fragile pressure regulator components. the least of your problems is when you remove a fitting to either refuel/drain/service and have the pressurized fuel tank burp fuel all over the place.

I use a small diameter copper tube within the vent line to form it into flattened "O"... works nice, keeps the line from being piched closed and its easier to support on the airframe overall.

showing a preference will only get you into trouble, 90% of everything is crap...

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