Fuel tank breather

[gareth lacey]

Hi Guys , any one know which is the best way to vent my fuel in wing tanks foreward or rearward .Tanks are pumped to injectors

 

Thanks Gareth

Edited March 3, 2023 by gareth lacey

[Old Koreelah]

Gareth this topic has been discussed here before (do a search).

Having a rear-facing vent invites fuel to be sucked out, or at least a drop in tank air pressure sufficient to stop fuel flow. That’s happened to me, leading to engine spluttering before I swapped tanks.

 

Forward-facing seems preferred. 

[facthunter]

Even a bad seal in a "FLUSH' Cap will give negative pressure in the top of a wing. Particularly a potential issue with a bladder tank.  Nev

[RFguy]

Jabs are air flow forward facing  and jabs dont have any problems with their fuel delivery.