Rochester Valve Location, 95 XJS 6Cyl

[RRoller123 (Peter Lenk)]

Excellent, thank you!

[RRoller123 (Peter Lenk)]

True, very small vacuum, or negative atmosphere, which causes that airflow.

[Kirbert (Author of the Book, former owner of an '83 XJ-S H.E.)]

@RRoller123

I have ordered a new Pressure Control Valve, but in the interim, I sprayed the innards of it with WD40, soaked it well, and purged it with compressed air, then tested the vacuum side with my vacuum pump, and it now appears to be working. Popped it back in place, and viola! No more wheezing when the tank cap is opened.

The PCV valve should have nothing to do with gas tank wheezing.

[exMBman]

Pressure control valve is aka Rochester valve.

Sixbanger has no PCV valve.

[Kirbert (Author of the Book, former owner of an '83 XJ-S H.E.)]

Ah, yes, that makes more sense.

[RRoller123 (Peter Lenk)]

Pressure Control Valve as in the diagram from VeeKay. My '95 XJS 6Cyl is connected and physically mimics that top drawing exactly.