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Briggs and Stratton powered Murray lawn mower?

After the engine, a Quattro 40, warms up it keeps cutting out every two-three minutes. I then have to re-prime and it starts again. I've changed the spark plug, cleaned out the carburettor and fuel tank, but still the problem persists. Can anyone help?
Wil Durrant, June 2008
I suggest a new carb diaphragm. It incorporates a fuel pump which sounds like it has failed.

phil_saunders@bigfoot.com

Phil Saunders, June 2008
link Click here to see other fixes for Briggs & Stratton.