On Apr 4, 2023, at 2:13 PM, Duane <txpigeon@...> wrote:
Pressure increases the boiling temperature for all liquids But... Increased pressure also causes increased temperature.
I've never run across anyone with a properly working EVAP system that had "boiling" or excess pressure.
Well, there may be at least two of us on this very email list saying it's happening to us. :-)
Mine acted up once, but it turned out to be the N80 clogged, so pressure built in the system.
Since the N80 cycles constantly after the engine warms up, there should be no way for it to build pressure.
Was this in your 2005 Rialta? What were the conditions (air temperature, altitude...)
I think it's possible that we are seeing different scenarios:
(A) a clogged or broken N80 will cause these symptoms under relatively benign conditions (low altitude, warm but not hot)
(B) in the 1997-2000s, a perfectly working evap system can get overwhelmed under rare conditions.
Mike
p.s. thanks for engaging on this, I appreciate the back & forth ideas...
