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3rd Gen High Performance and Accessories (5.9L Only) Talk about Dodge/Cummins aftermarket products for third generation trucks here. Can include high-performance mods, or general accessories. THIS IS FOR THE 5.9L ONLY!

Put your CR Pressure Relief Valves back in!

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Old 12-02-2013, 05:08 PM   #46
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Resurrecting really old thread. I may need a new PRV; where's the cheapest place to get one? Cheapest I've found so far is $450. Ouch.
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Old 12-02-2013, 05:41 PM   #47
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Try T&C Diesel.
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Old 12-02-2013, 05:48 PM   #48
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Try Hoesli Diesel at hoeslidiesel.com. They list the PRV - Cummins part number 3947799 at $ 265.75.
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Old 12-02-2013, 07:57 PM   #49
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2nd TC Diesel.. Todd will help you out.
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Old 11-19-2017, 03:59 AM   #50
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So that's why I have never cracked an injector... I left well enough alone... I had considered it several time when I had my Smarty TNT-R; any additional rail pressure adjustment (via the Smarty) would set of a "Rail Pressure to high" code. Seemed very annoying at the time and I even considered a block off or plug solution. Through my cheapness (retrospective wisdom in this case) I decided to just back the rail pressure setting back to normal (although increased I'm sure). Years later I have switched to HP-T/ANARCHY which I'm sure raises rail pressure but evidently at a more controlled rate... 6 months with the new system and narry a code since. My PRV is the same one installed in 2005 when the engine was built.

What causes them to fail? My truck has 120k on it and has been tuned 100% of the time since 40k in 2007 when I bought it from Carmax. While I don't drag race my truck I'm not easy on it by any means. It has seen 135mph, it has seen 4200 rpm but neither very frequently. Based on the evident averages I should be on my 3rd or 4th PRV by now. I am also still using the original injectors which have never been touched. If I could only find a manual transmission that was as durable as my PRV.

All that said has anyone created a PRV that would hold a few thousand more psi? Would a PRV from a late 4th gen be an idea? As I understand it the CP4 runs higher pressure albeit at lower volume to the shagrin of the high performance world. I'm wondering if the cp4 PRV could be adapted to the 5.9/6.7 cp3 engines. Any thoughts?
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