Missing vacuum line or plug?

Archer911 · Oct 6, 2017

ME308 said: ↑

yub, line 22 should not leak -
otherwise, when ever the engine pulls vaccum, like under breaking, unmetered air would be drawn into the plenum ... engine stalls

for a first test, you can take line 22 off the plenum at juntion 24 and close that hole (line 22 will leak to atmosphere during the test)
sure, you could just tape line 22 - but maybe it is also perforated else where ...
report back what you find

the canister valving construction lets the gas tank pass excess pressure (with gas vapors) out through the charcoal bed to atmosphere
whenever no engine vacuum is present, but the pressure in the tank builds -
it draws air through the charcoal bed (to "dry" it) when engine vacuum is present.
Click to expand...

I plan to replace all of the line associated with the anti-evaporative circuit as it's all original. I attached a vacuum gauge to junction #24 when setting idle to verify an acceptable range.

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Missing vacuum line or plug?

Archer911 Formula Junior

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