wdwhittington wrote: > A year or so ago my ercoupe began what appeared to be using > fuel out of the right tank only. I too checked all lines and valves. > One day when I was flying I noticed the fuel placard on the left > tank was coming loose and flapping up over the vent in the left > tank. Also I noticed a blue haze flowing over the left wing tank. > When I landed I removed the placard from the tank, problem solved. > The only thing I can think of is the placard covering the vent > caused a low pressure in the tank and the fuel from the right > transferred to the left tank. It's never hapened since. The blue > haze was 100ll. n93803
So, if a person had a clogged ram-air-vent on one fuel tank cap there wouldn't be that extra pressurization the ram air inlet provides. That could let the OTHER tank's ram air pressurization force a fuel cross feed which could leak out if the fuel cap gasket is old and flaky. Those front-facing fuel cap vents are supposed to provide a bit of ram-air pressurization to help with fuel feed, I guess. Anyone know what psi is given by 100 mph ram air? Not so much, I'd guess, but enough for wdwhittington's problem at least. That's a new thing to keep in mind. Ed
