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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Fuel Line Routing?
05-25-2015 08:04 AM  3 years agoPost 1
Aaron29

rrProfessor

USA

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Hello,

I have been having issues with a gasser that likes to siphon fuel out the vent line.

I put the vent line to bend down and then go below tank toward the gear like the manual wanted.

So what gives?

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05-25-2015 01:53 PM  3 years agoPost 2
turboomni

rrProfessor

East of the Equator

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I put one loop in the line then down. Then you won't have that problem. Check valves are a bad idea.

Setup is everything, All my heli's can fly far better than I can pilot them

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05-25-2015 02:54 PM  3 years agoPost 3
don s

rrElite Veteran

Chesapeake, VA

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After it exits the tank, wind the vent line about 4-5 turns in a coil, maintain the coil shape with velcro strap strips.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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05-25-2015 05:52 PM  3 years agoPost 4
Aaron29

rrProfessor

USA

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Should the loops be above the level of the tank? Even with it? Below it?

I believe what happens is fuel gets into the vent line when inverted. Then I can flip back upright and what was in there leaks out. The more stunting, the more leaking. I don't understand how it siphons from the top of a tank, but it happens and the flight time is less than half. So weird. A flip or two gets it started and if I tried to fly out my 15 minute timer it'd crash. But if I hover upright, I get a full 30 minutes with no siphoning.

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05-25-2015 07:49 PM  3 years agoPost 5
RM3

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Killeen, Texas - USA

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i have always had that problem. and I have a tall coil with 2 turns that is taller than the fuel tank... and I still get alot of spillage when flipping, rolls, tic tocs etc...

most of the guys that seem to get good results have the coils even with the tank.

besides, with my setup, if I fly aggressive, on a full tank I get only 12 minutes max.

Ive often given the thought of trying one of those fuel "bags" that the boat guys run... no air in the "tank" and no vent needed. problem is they have a weird shape that does not fit the tank area very well.

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

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05-25-2015 08:03 PM  3 years agoPost 6
don s

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Chesapeake, VA

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I would mount the coil above the tank.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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05-25-2015 10:30 PM  3 years agoPost 7
jackp332

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Claremont, Nh USA

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Aaron, this is how I have one of my gassers routed and it doesn't seem to leak too much. Then again, I'm not too much of a flip flopper- just wanted to show you how I do it. On my other (same mechanics) I have the vertical coil next to the tank (top of coil is above top of tank) secured with velcro. I have seen others who use this trick one-way little vent valve that mounts in the top of the tank. I believe I have seen them on one of Rajas birds and also Carey Shirley's.

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05-25-2015 10:42 PM  3 years agoPost 8
turboomni

rrProfessor

East of the Equator

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Mine has one loop above the tank and goes straight down to almost the skid. It is also a smaller diameter than the other fuel line and I have no leaking out of it. My Spectra came with a one way for the vent but was told by many to not use it. So I didn't.

Setup is everything, All my heli's can fly far better than I can pilot them

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05-25-2015 11:11 PM  3 years agoPost 9
Aaron29

rrProfessor

USA

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OK I'll try some judicious plumbing. But it sounds like that doesn't entirely fix it?

Being that it's just an air vent, how small can the orifice be? I don't want to try to replace the nipple and line, but I could see putting something in the end of the line, like a plastic stopper with a small hole drilled in it?

After reading, I don't think Iwant a check valve. If it fails closed it'll cause lean run or fuel starvation.

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05-25-2015 11:13 PM  3 years agoPost 10
RM3

rrElite Veteran

Killeen, Texas - USA

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I tried a check valve... bad idea. would fuel it up the old way (before a dubro fuel port was added) and when I would remove the plug to fill, the mild pressure in the tank would sometimes cause fuel to spurt out of the filling line.

this is how mine is setup... works, but still get spillage.

I used a small dia copper tube inside the line to keep the shape and prevent any kinks, then velcro it to the frame...

the vent inside the tank has been pressed to a smaller dia to allow just enough air to breathe thru it... so about a 1/16 dia hole is what it has... and it works fine for even this thirsty 22cc stroker.

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

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05-25-2015 11:15 PM  3 years agoPost 11
Aaron29

rrProfessor

USA

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Yeah if that leaks I don't see how I can fix this.

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05-25-2015 11:15 PM  3 years agoPost 12
turboomni

rrProfessor

East of the Equator

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I don't notice any leaking fuel anywhere on my 2 gassers with that setup.

Setup is everything, All my heli's can fly far better than I can pilot them

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05-26-2015 12:21 AM  3 years agoPost 13
jackp332

rrKey Veteran

Claremont, Nh USA

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This is my tank setup after I moved the tank underneath the radio tray to fit inside the scale fuse- for what it's worth.

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05-26-2015 01:16 AM  3 years agoPost 14
turboomni

rrProfessor

East of the Equator

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Nice setup work there Jack,,,impressive!!

Setup is everything, All my heli's can fly far better than I can pilot them

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05-26-2015 01:23 AM  3 years agoPost 15
Aaron29

rrProfessor

USA

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Very clean looking.

All my stuff always looks like a rat nest.

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05-26-2015 08:34 AM  3 years agoPost 16
jackp332

rrKey Veteran

Claremont, Nh USA

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Thank you guys very much

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