To Fuel Vent Mod or Not?

[WolverineYX]

I have a legacy Waiex TD with a fuel vent built per plans. The airplane is getting close to inspection and first flight. I see reference to modified fuel vents on this site but I am having a hard time deciding whether modifications are needed or not based on what I am reading.

Bottom line, Should I modify the original vent set up? If yes, best procedure/design. If no, what are potential issues?
Thanks for any and all opinions.

Chad

[Area 51%]

On my plans there are two possible vent scenarios. One coming from the filler area then heading down and out the bottom, the other sticking up a few inches to allow for a fuller tank.
Either one could/should be complimented with Peter Anson's check valve.
I personally went with the vent above the cowl facing into the breeze. (I would say wind, but I have the 80hp engine)
I have never had a drop of fuel exit the tube.

I'm guessing you are talking about a modification like Mike Smith has though.

What you don't want is what I witnessed on the factory Xenos. The vent tube is attached at the rear of the tank at the upper-most fitting where a fuel quantity sight-tube should go. It then runs forward through the firewall and out the bottom. Anything close to a full tank gets gas flowing out of that vent.

[Skippydiesel]

There may be practical difficulties with what I am about to say however the principal is sound;

Take your vent tube to the highest point in the aircraft - give it 2 or more loops - exit out the lower fuselage.

Should not be so hard to include an aluminium tube (breathers can me made using malleable brake tube or similar), of this design/location in the build stage.

For the most part this will accommodate fuel expansion on hot days. Will not vent fuel /fumes anywhere neat hot engine components. Will not be influenced by your aircraft being parked on a slope or being flown out of balance.

[WolverineYX]

Ok, I see the options on the plans now. I think I will stay with the original build for now and see how it goes. Thanks for the replies!