bulletproof 14 Report post Posted October 6, 2009 (edited) I recently installed a k7 unloader on my 3500 psi 3.5 gpm direct drive pump (comet66dx).The installation appeared to be straight forward but for some reason the machine is now consistently blowing the 3/8 hose that comes from the unloader bypass (to what I think goes) back to the pump. The only thing that I did in addition to swapping out the old unloader was to change out the fitting at the pressure relief valve to a straight 3/8 barb, could this be the problem? I mean as soon as I turn on the water supply it blows a hole in the hose. Any help on how to rectify this would be great. Edited October 6, 2009 by bulletproof adding additional info Share this post Link to post Share on other sites
Russ Johnson 141 Report post Posted October 6, 2009 You need to bypass to the fitting below the pop off valve. Get some braided vinyl tubing so it'll last, and get an oilcap. Share this post Link to post Share on other sites
Paul Kassander 26 Report post Posted October 6, 2009 Yes you have the bypass line on the high pressure. what probably used to be there was an easy start valve which may look like a barb. Share this post Link to post Share on other sites
offduty 25 Report post Posted October 6, 2009 (edited) ..... Edited October 6, 2009 by offduty wrong thread Share this post Link to post Share on other sites
bulletproof 14 Report post Posted October 7, 2009 Thanks so much for the help. Two more question though. When I return the trv do I need to plumb it to anything or can I just leave it. If I am understanding what I am being told, I need to attach the barb to the lower fitting that I have pointed out in the attached photo Share this post Link to post Share on other sites
Russ Johnson 141 Report post Posted October 7, 2009 (edited) You can remove the TRV ( the fitting in the lower hole), install a "T", put the TRV back in the end of it, and install a barb for your bypass return. Edited October 7, 2009 by Russ Johnson Share this post Link to post Share on other sites