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Discussion Starter · #1 ·
At half throttle rail pressure gets to about 20k and drops to about 15k as I mash on it more. Pulling a trailer up hill will also pull rail pressure down. Injectors replaced 4k with ago with 20% all rubber fuel lines replaced on engine,filter head rebuilt and nicktane cat filter added and has a super chip flashpac on it (efi live next) truck has 230k on it possibly injector pump weak or need a lift pump
 

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What's the year, make and model of the truck? Very common issue on the 04.5 and newer is the Fuel Pressure Relief Valve getting weak. Shim it or do the plug, don't do the plug with a modified CP3. James
 

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Discussion Starter · #5 ·
Its a 02 lb7 ,fuel filter only few months old
 
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