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-   -   gasser line (https://www.rcuniverse.com/forum/questions-answers-154/10002179-gasser-line.html)

joco1 09-14-2010 04:49 PM

gasser line
I have all glow planes but i am planning on getting into gas in the future ,i have been looking on the classified section of this site and notice on about all gas planes ,on top of the fuel tank there is a loop of hose ,or what appears to be fuel line ,was just wondering why it is like that?

mighty9 09-14-2010 05:44 PM

RE: gasser line
Its the tank vent...positioned there to prevent fuel from running out the vent when moving the model around.

Charlie P. 09-14-2010 08:09 PM

RE: gasser line
Yepper. Be sure to lead it around in a loop and outside the fuselage because when you fill up it will squirt out the vent when topped off. The loop keeps a siphon from occurring

jetmech05 09-15-2010 04:41 PM

RE: gasser line
The above answers are correct, but I'd like to expand a bit.
Gasser have a different carb than glow engines....gassers don't need head pressure on the fuel tank, because the carb has a pump....so there is no line from the muffler.
Remember that a fuel tank is never empty. it's either full of fuel or full of air...or a mix of the two. So to put fuel in you must let air out, to take fuel out you must let air in, that's why there is a vent line. Just like full scale aircraft there is a vent system. Like said above the line is looped to keep you from spilling fuel.

Take note that you cannot use the same fuel lines or the same gas tank stoppers for gas that you do for glow.

When you set up your gassers tank plumb it like a glow tank, a vent tube pointed upward, a line with a heavy clunk to the carb, and a line with a clunk for fill......

I don't de fuel my gassers as it helps to keep the tygon lines plyable. But I recommend that you put a stopper in your vent line, and don't store your airplane with a full tank, leaves room for expansion.

You can use the fill line to de fuel for maintenance.

Hope I helped ya.

joco1 09-15-2010 07:09 PM

RE: gasser line
thanks very much for the info, i will print this off for future reference!

Charlie P. 09-15-2010 07:32 PM

RE: gasser line
Note - if you have to buy gasoline with 10% ethanol like I am forced to do you may want to reconsider leaving the fuel in the tank. The alcohol attacks the rubber in the carb diaphragm pump and some fuel lines if left in contact with them. I drain AND run the carb dry after defueling.

blikseme300 09-15-2010 07:50 PM

RE: gasser line

I don't dispute that alcohol attacks certain parts of older carbs, however the "modern" components of carbs appear to be immune to this due to changes in materials used.

The reason I drain my fuel tanks after flying is done is that I store my aircraft nose down in the vertical position. If I forget to defuel I will have the smell of gasoline in my garage, not good.

I don't ever run my carbs dry and have had no problems with engines that have not run for more than a year. Milage may vary for others, of course.


Charlie P. 09-15-2010 07:58 PM

RE: gasser line
This is from the manual of a gas 34cc engine I bought two months ago:

Use only low-octane, alcohol-free gasoline. The carburetor diaphragm will gradually deteriorate if you use gasoline with alcohol (ethanol, gasohol, etc.). You will need to replace the diaphragm in about 80 hours of operation if you use gasoline with alcohol.
This has a Walbro carb. All of my gasoline models use Walbro carbs. So I drain.

Your mileage may vary.

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