vlad 14 Report post Posted February 24, 2006 I haven't used my back-up power washer for about 6 months. It is 4gpm, 3000psi,comet pump direct drive.Started today , with open boll valve hose pulsating very bad , almost jumping with boll valve.With soap nozzle runs good , with 4.5 nozzle no pulsating , pressure 2800psi .What can be wrong? Thanks. Vlad. Share this post Link to post Share on other sites
Don Phelps 85 Report post Posted February 24, 2006 Could be the pump, but more than likely it's air somewhere. How long did you let it run while this was happening? Share this post Link to post Share on other sites
steve r 14 Report post Posted February 25, 2006 I haven't used my back-up power washer for about 6 months. It is 4gpm,3000psi,comet pump direct drive.Started today , with open boll valve hose pulsating very bad , almost jumping with boll valve.With soap nozzle runs good , with 4.5 nozzle no pulsating , pressure 2800psi .What can be wrong? Thanks. Vlad. sounds like an air problem.is it running off a spighet or tank.How many feet are you running whaen it pulsates? Share this post Link to post Share on other sites
John Orr 206 Report post Posted February 25, 2006 I had that happen to me (well, to my rig) once and it turned out to be the low-pressure side of the pump. Share this post Link to post Share on other sites
