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stuck on a simple B & S quantum engine

1589 Views 13 Replies 5 Participants Last post by  themidniteryder
I picked up a wheeled string trimmer for $20.00 that had been sitting for a few years. The carb was full of varnish but I cleaned it all out and verified the passages were clean. The fuel bowl nut has the gasket and all 3 holes are open and clean on it. The seat had mushroomed out, so I pulled it and replaced it and the float bowl vents out to the atmosphere. I put a new gasket between the air cleaner assy and carb as well.

The problem I'm having is that it will start and run for 1-2 seconds max and then die. Wait 5 seconds, try it again, and same response. The governor linkage appears fine as does the throttle linkage and its all assembled in the correct way. Loosening the fuel bowl nut causes gas to come out at a good stream so fuel is making its way to the bowl. The gas tank was empty when I refilled it so its not an old gas issue.

I'm stumped. This carb is clean enough to eat out of now and its all put together correctly. Next up.. muffler?
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change out the welch plugs,&clean those little passages too
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