I used a stethoscope to determine the worst of it coming from Cylinders 2 & 4 with leakage at 1 & 5 as well. With air pressure applied, I was getting a lot of noise from the oil rail. It moved closer to desired when the idle speed was raised. At the time, I was attributing this to the manner in which the test hose & fittings were installed. My thought was once the crank no start occurred, I could use the shut off valve to quickly dead head test the pump & then break in to the rail side of the system & air check while the engine was good and hot. The ICP was higher than desired with this set up installed by roughly 400-500 psi. When I performed testing prior to replacement of the parts, I set things up so I could have a gauge inline with the hose from pump to cylinder head & a shut off valve as well. Suspecting a high pressure oil system leak, I obtained the necessary fittings to air check the system. I got the engine warm & confirmed the complaint while monitoring ICP on the scanner. I suspected a leak in the high pressure oil system so I scanned it for codes & retrieved a 164-1 for ICP unable to build during cranking. I've posted a couple different things about this truck but it has yet another issue (surprise!) Customer complaint was long crank/hard start when the engine is warm. Good afternoon all and thank you for your time.
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