thanks David. Thought if purge valve failed fumes might get into
intake via the larger hose from the purge valve.

but maybe my logic is wrong? The purge valve failure mode is closed?

Neil.

On 8/26/12, David Beierl <dbeierl@attglobal.net> wrote:
> At 11:45 PM 8/25/2012, neil n wrote:
>>could the EVAP purge valve diaphragm fail open allow fuel vapours to
>>flood the intake and  cause  a hard arm start?
>
> Seems extremely unlikely, especially since the purge suction is
> through a practically microscopic orifice (.oo5"? - I know it's
> smaller than a #80 drill bit, which is .013").  I believe anything
> that did manage to accumulate would be blown through in one revolution.
>
> Yrs,
> d
>
>

--
Neil n

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