I'm just curious - I'm getting a lot of hissing (pressure not vacuum) from the fuel cap when I remove it and the tank is near empty. This is on my 560SEL.


I'm just wondering at what point do I suspect something is amiss? Should I suspect some sort of purge/evap valve? Never really dug to far into the W126 vapor recovery system. How normal is this, and does anybody know of a decent way to test it?


Thanks much!

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition