Last week my Mountfield SP530 with Briggs and Stratton Sprint engine 10D902, cut out five or six times as I was cutting the grass. There were some up and down revs before it died each time. It restarted straight away on all occasions. However this week it would no longer start. It seems that no fuel is entering the carb when pushing the primer, just a rushing air noise. The primer button seems OK, and the fuel is fresh and contains additive. Could it be a simple blockage or something more serious?

KJS2009, June 2009

More likely to be a ruptured diaphragm. You will still need to remove tha carb/tank, but when you seperate them just put them back with a new diaphragm kit. Costs about £1.

phil_saunders(a)bigfoot.com

Phil Saunders, June 2009

Its just a small blockage in the carburettor thats causing this...it needs to be stripped down and cleaned out with some aerosol carb cleaner. A compressed air supply helps too!

John, June 2009