I have a strange problem with the fuel tank / evap in my 986S.
It varies in severity, but most of the time it will not take fuel in any significant amount without burping it back (backs up the neck).
Basically i have to add fuel for a few seconds, listen for it to begin to back up, let it subside, and continue. Dozens of times. Of at least a few.
Let's begin with some basics:
1.) the relay opens the filler seal - a) i *can* fill it and b) i hear the relay click
2.) there are no evap codes - in fact no codes at all
3.) I put a small hose down the filler neck with the fuel nozzle to vent it manually - no effect (maybe i submerged it?.... dunno)
and i should mention this vent hose also would have detected any physical blockage - it was basically a snake.....
i have not put a bore scope down...yet
4.) As one adds fuel, it gets less severe (e.g.: as it fills up it gets easier to get fuel in)
5.) sometimes -- and this seems to depend on temperature, it works normally or nearly so.
6.) it is NOT simply a matter of shutting off the nozzle. The fuel will, in a delayed reaction, come up the filler neck and spill out, as if under pressure.
6a.) ... even with a physical vent in place
I have not checked the entire venting apparatus since my wheel well liner has turned to stone... but I will, but if it was not venting i would expect an evap code.
has anyone heard of such an oddball situation? Any thoughts having to do with the strange shape of the tank?
TIA,
Grant
Grant
gee-lenahan-at-gee-mail-dot-com