Unloader Bypass Problem

[bulletproof 14]

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

[Russ Johnson 141]

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.

[Paul Kassander 26]

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.

[offduty 25]

.....

Edited October 6, 2009 by offduty
wrong thread

[bulletproof 14]

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

[Russ Johnson 141]

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