randyh56 14 Report post Posted June 17, 2005 I have an almost new shurflo pump (100psi at 1.6 gpm). When I first got it I just mixed the chemical and dropped the draw end in the cleaner. The pump would run til the hose was filled up then shutoff just like it is suppose to. It ran then only when I pressed the trigger jet handle to release the chemical. Worked great up until the last roof job. Now here is my problem. I do the above pump stops when line is full. I test spray all seems to be good. Now when I start spraying instead of the pump continuing to run as I spray the pump goes to off on off on even while I am still hold the spray gun trigger down. The spray spits and sputters down to nothing. Anyone have a solution or thought? Share this post Link to post Share on other sites
seymore 90 Report post Posted June 17, 2005 You could try adjusting the pressure switch on the cap of the pump.Just give it a few turns clockwise while holding the triggerCheck all of your screws to make sure you are not sucking air somewhere. Share this post Link to post Share on other sites
Pams Pressure & Clean 64 Report post Posted June 17, 2005 Or possibly a slight blockage in the line or fittings (corrosion if using el-cheapo brand fittings) causing the fluctuation in flow and pressure... Share this post Link to post Share on other sites
Mathew Johnson 123 Report post Posted June 18, 2005 Try a larger orifice bozzle. I had a cone nozzle that did the same thing when I tried to spray a fine pattern - when I opened the nozzle to a larger diameter, the problem resolved. matt Share this post Link to post Share on other sites
the_GUNN_man 14 Report post Posted June 18, 2005 Try a larger orifice bozzle. I had a cone nozzle that did the same thing when I tried to spray a fine pattern - when I opened the nozzle to a larger diameter, the problem resolved.matt I had the same thing. My pump would pulsate when I used too small of a nozzle. Bigger nozzle and it worked fine. Share this post Link to post Share on other sites
Tronman 14 Report post Posted June 27, 2005 What size PSI are you using to get to the roof of a two story home? Are you using a wand extension? Share this post Link to post Share on other sites
randyh56 14 Report post Posted July 19, 2005 My pump is 100 psi at 1.8 gpm. Share this post Link to post Share on other sites
PLD 14 Report post Posted July 19, 2005 I had the same thing. My pump would pulsate when I used too small of a nozzle. Bigger nozzle and it worked fine. Ditto. That's happens when a pump with a pressure switch ( a "demand" pump) senses the increased line pressure caused by the orifice. If you want to use a smaller orifice, get a bypass pump. It has an internal unloader and no pressure switch. Share this post Link to post Share on other sites
tropical wave 22 Report post Posted July 19, 2005 Ditto. That's happens when a pump with a pressure switch ( a "demand" pump) senses the increased line pressure caused by the orifice. If you want to use a smaller orifice, get a bypass pump. It has an internal unloader and no pressure switch. my next shurflo will be this type......mess with the pressure switch too much and it will get wrecked.....I would like to be able to dial the cone tip to a small opening at times but then the pulsating begins.... but to answer the question, the prior posts have already done that.. :cool: Share this post Link to post Share on other sites
coltleader 14 Report post Posted July 20, 2011 I asked a similar question about a month ago, but I still haven't received the answer I'm looking for! Has anyone used the shurflo 8000 pump? Also, what has your experience been with the it, and how does it compare? Thanks for the advice. Share this post Link to post Share on other sites
