Vent line on a gasoline engine ..how to..
 

Hi,
I am in the process of plumbing my first Gasoline engine and fuel tank setup.

I am using a 3 line system.

It just does not seem correct/proper to terminate the vent line by just having a piece of Tygon hanging out the bottom of the cowl.

Should there be a filter in the vent line to prevent crud from blowing back up into the tank?

Is there a fitting available to terminate the vent line at the bottom of the aircraft?

Just want to make sure my set-up is bullet proof and avoid any problems.

Thanks,
Ken -MI

RE: Vent line on a gasoline engine ..how to..
 

your vent line should be long enough to wrap around the top of your tank then out of the cowl. I have a DL50 that the vent line comes from the tank and makes three loops that I tied to the engine box then down to the cowl. Any dust or trash has a long way to go before it ever makes it to the tank.

RE: Vent line on a gasoline engine ..how to..
 

See Don's Hobby Shop for vent line filters.

http://www.donshobbyshop.com/

RE: Vent line on a gasoline engine ..how to..
 

I know you asking more about whether or not to have a filter, but what I do for the vent line exit/termination is use the same thing as for the filler - http://www.slimlineproducts.com/onli.../f1_fueler.htm. I run the vent out through the bottom of the plane just ahead of the fuel tank as opposed to running it back up into the cowl.

Dan

RE: Vent line on a gasoline engine ..how to..
 

As long as the vent line has a U-loop in it, any exit position is fine. Some route it towards the fuselage end.
A filter in the vent line is not needed. Any dust that makes it up that line without sticking to the wet line wall would be a miracle. The line is flushed each time the tank is filled to overflow.

RE: Vent line on a gasoline engine ..how to..
 

Thanks to all for the valuable insight on vent lines! All suggestions and ideas are 'right on' and much appreciated!

Ken - MI

RE: Vent line on a gasoline engine ..how to..
 

Listen to pe reivers......He knows his gassers and will give you the correct procedure..