Yale G83P-040
1970
Chrysler slant 6 engine


Velocity Governor question*

Symptoms:
Propane forklift started running rough and stalling, restarts got harder and longer till
the thing would only just fire a couple times but not start up.

Had an old BEAM regulator and carb.
Since I got the machine 3-4 years ago, I knew the regulator had problems because
when you turn the key 'on' the fuel solenoid clicks, and you could hear propane hissing
into the carb....even before the engine is running.

SO.....got a new IMPCO regulator and carb, installed and mounted.

STILL does the same thing with these new parts, although, it does idle and will
rev up, but starts a lean out trend over 20-30 seconds and then stalls.

Sometimes it seems rich enough and revs up crisply, and idles, then it 'goes lean', runs rough, stumbles and eventually dies after 20-30-60 seconds.


There is a velocity governor under the carb........

* My key question is, HOW DO THEY FAIL ?
Is there a diaphragm inside that can break and let in a giant vacuum leak?

Seems like there is an intermittent lean out condition going on here.