Unusual Carburator vacuum leak
Posted: Thu Jul 28, 2022 10:43 am
Well this is something you would not expect to experience.
A plug fell out of the top cover plate of my forward Carb, PIX attached.
For some time, I have suspect a vacuum leak, just based on how she
started and ran until hot but could never point point any issue.
Then, on a 200 mile dive to a trail head she started to run like crap.
Low power and my AFR meter was reading a very rich condition.
Stopped at a buddies house and started to tear into the problem (Jim L
gave me some clues to track down). Hmmm, Spark plugs 1 and 2 showed
signs of poor ignition -- so, moved up to the carbs and right away noticed
a plug was missing, right next to the accelerator pump reservoir. Pulled
the jets and they were completely plugged up. Soooo, that vacuum leak
was also pulling dirty air into the accelerator reservoir. The net result
was plugged jets and fuel leaking into throttle-plates that was not in a
vapor.
Plugged the hole with a grommet and off she ran.
A plug fell out of the top cover plate of my forward Carb, PIX attached.
For some time, I have suspect a vacuum leak, just based on how she
started and ran until hot but could never point point any issue.
Then, on a 200 mile dive to a trail head she started to run like crap.
Low power and my AFR meter was reading a very rich condition.
Stopped at a buddies house and started to tear into the problem (Jim L
gave me some clues to track down). Hmmm, Spark plugs 1 and 2 showed
signs of poor ignition -- so, moved up to the carbs and right away noticed
a plug was missing, right next to the accelerator pump reservoir. Pulled
the jets and they were completely plugged up. Soooo, that vacuum leak
was also pulling dirty air into the accelerator reservoir. The net result
was plugged jets and fuel leaking into throttle-plates that was not in a
vapor.
Plugged the hole with a grommet and off she ran.