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Posted to rec.crafts.metalworking
Doug
 
Posts: n/a
Default OT Primer on a snowblower, how does it work?

hmm.
on all the 4 stroke snowblowers i've worked on, the primer bulb goes to
the vent of the carb. when you pump the primer, it pumps air into the
area above the float, providing pressure. This pressrue pushes fuel up
the main jet and idel jets into the throat of the carb.

when you tear the primer on the ones i have looked at, it still runs
fine.

an interesting gizmo is the boondocker nitrous system for snowmobiles.
it squirts nitrous into the air box before teh carbs, then bleeds a
very very small pressure off the nitrous pressure to mildly pressurize
teh float bowls for the extra fuel the engine rquires with nitrous.
truly ingenous.