If the motor is still running fine when this happened it is either a failure in the linkage between the gas motor and the pump. or the pump itself. if it looks like the motor does nothing whatsoever. it may be the link between the two. if the motor does a little bit, then the problem may be with the pump. Try turning off the engine while spraying and see if the pressure drops at all
I Just fixed mine and the problem was in the bottom brass part of the pump. all it was, was a bit of dirt jamming one of the three little one way check valves. It was blocking it open causing no pressure. before this i had removed the main filter thinking it was not needed. big mistake. it took me 8 hrs to find the problem.
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