Gas Tank pressure

[glen-sj]

start by checking into the fuel vent system, perhap there some blockage. There is a expansion tank and a chacoal canister in the vent system.
http://www.realoem.com/bmw/showparts...03&hg=16&fg=10

[bimmerd00d]

start by checking into the fuel vent system, perhap there some blockage. There is a expansion tank and a chacoal canister in the vent system.
http://www.realoem.com/bmw/showparts...03&hg=16&fg=10

Also, if you can't find this, it's inside the passenger wheel liner...I watched Scott H and a handful of guys replace a tank a few years ago and i had no idea that was even there

[ScottyWM]

Also, if you can't find this, it's inside the passenger wheel liner...I watched Scott H and a handful of guys replace a tank a few years ago and i had no idea that was even there

Thanks guys, I assume that is inside the rear passenger wheel well. As the problem seems to have corrected itself, I'll probably put this off for a while. It may be that it got clogged, then blew it out or blew off a hose or something.

[bimmerd00d]

Thanks guys, I assume that is inside the rear passenger wheel well. As the problem seems to have corrected itself, I'll probably put this off for a while. It may be that it got clogged, then blew it out or blew off a hose or something.

It happens to my E34 wagon, happened to my old E34, happens to my E39 540i too. It seems to come and go with temperature. It will only do it on the hottest of days with the wagon.

[genphreak]

Seen it on and off without detriment on many cars, inc all my e34s (but not very often). Happens when the tank is fairly empty and has warmed up quickly (pressure) or if it has cooled down (vacuum).