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A Fuel Rail Pressure Relief Valve is a fairly simple part that can cause a host of problems on common rail diesel engines. If it’s time to replace you have two options; a stock replacement which will bleed off pressure at a predetermined amount, or a “race plug” which doesn’t. Typically, those running performance parts like a tuner, lift pump, larger injectors, etc. will opt for the plug. This means you: 2003 – Current 5.9L / 6.7L Cummins, 2001- Current 6.6L Duramax’s, and 2011 – Current 6.7L Po

If the truck doesn’t know how much pressure it’s making, how can it...