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In Reply to: Re: riding mower posted by Dom on Saturday, April 19, 2008:
Before condeming pump,try a simple test,reassemble gas line that goes between tank & pump,disconnect line at pump inlet,plug hose with a 1/4" or 5/16" bolt,put gas tank end in your mouth,suck air out of line & seal end with your tongue,see if you can hold a vacume on line,if you can't then you have an air leak in line & this is your problem,if you can hold a vac,then problem with pump,either from a bad diaphram,incorrect reassembly,plugged passages in pump body,warped pump body or cover plate & air being sucked in around edges of diaphram,pump houseing cracked,pump diaphram not getting pulses from crankcase,due to loose hose connections,air leak in hose,plugged hose or possible internal problem in eng.