Richard Tree Posted December 9, 2023 Share Posted December 9, 2023 Has anyone had a problem with the common rail pressure relief valve leaking on the 5.9 and 6.7 ISB? I noticed a small wet spot at the top of the boss where the valve threads into the common rail. This part number is normally a Cummins 3947799 (per ESN) and is rated I have read at 27000psi. The Bosch number is 1110010029. Any insight here? There seem to be lots of sources for new valve (Maybe worn) and some knockoffs for the RAM crowd. COLA shows a $500 price? Thanks! Link to comment Share on other sites More sharing options...
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