Re: Rebuilt Marvel Schebler Carb, now engine runs

Posted by gshadel on August 03, 2005 at 07:15:21 from (69.215.227.130):

In Reply to: Rebuilt Marvel Schebler Carb, now engine runs wors posted by Fredrick Sheffield on August 02, 2005 at 13:29:29:

Fred, those symptoms do sound like ignition problems. After replacing all those components, did you check your spark? Should be a zappy, blue spark, not a weak orange spark. Might be something as simple as a corroded wire connection, point gap too tight, or worn out plug wires.

I know what you mean on the carb rebuild kits, last time I bought one I was really disappointed with it. If you have gas leaking out the air intake, your needle valve ain't getting the job done. When these upflow carbs get overfilled with gas the engine won't run at all. Make sure you shut-off the fuel to the carb when not running. These new rubber tipped needle valves just don't seem to shut-off the gas 100% and the carb floods after sitting a short time. Also check your shut-off valve to make sure it indeed does shut-off. I found mine was leaking thru when I had similar problems.
Also, pull the drain plug on the bottom of the carb with the shutoff valve open, let it drain for at least a couple minutes. The gas flow should be strong and steady the whole time, no slowing down, gasping for air, etc. If it isn't solid the whole time, you have a clog in the fuel line. My guess is you checked the elbow strainer going into the carb when you rebuilt, you also probably have a screen inside the tank, maybe another one in the top of your fuel bowl.

I noticed on my carb. kit, the float gap in the instructions was different than the manual. I went with the rebuild directions, big mistake,the carb would flood within minutes of shutting of the engine. I ended-up pulling the carb back off and re-adjusting to the manual spec's. The manual has a test for measuring the fuel level in the carb bowl using a piece of clear tubing stuck in the drain plug hole. Do that to make sure your float is set right.
Hope this helps.
George

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