check your fuel filter for blockage[usually found inside petrol tank] if not that, blocked jets in carb.
gerry millen, October 2009
Replace internal and external fuel pipes
Gordon, June 2007
rebuild carb, diaphram gets stiff from alcohol in gas
get kit $10 at local friendly garden tool supply repair
place
joe dudek, April 2006
remove guards & watch what happens on your fuel lines when you press primer - small cracks will pull air into fuel line (look for air bubbles/small drips - could also be dirt in carb., dirty air filter or dirty fuel filter (if fitted)
sean, May 2005
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I can answer this question...
STRIMMER RUNS BRIEFLY UNTIL PRIMED PETROL RUNS OUT?