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Message: [QUOTE="golfer, post: 862468, member: 266"] ...or watch the factory dummy LPOil gauge (upper left corner of cluster) while cranking. if the dummy gauge doesn't jump up within a few engine rev's while cranking..or doesn't come up until after the truck starts...then you have a 'leak' in the oil system...could be a leak in the HPOil system or a leak in the LPOil system. (internal leak, not external) the reservoir is the highest point of engine oil on/in the engine...so the weight of that oil can push past any compromised component (inj poppet valve, inj o-ring, IPR, IPR o-ring, LPOPump gerotors, LPOPump to front cover, etc, etc)...and drain the reservoir. without oil in the reservoir...the LPOP will have to prime the reservoir before the HPOPump has any oil to 'work with', everytime the truck sits (typ more than 5-8 hours)..which can/will cause extended cranks prior to the engine starting. also if the truck sounds 'quiet' or slightly rough/uneven after it does start...that's also an indication that there is air in the HPOil system due to the injs/HPOP getting air (mixed w/ oil) instead of just HPoil. [/QUOTE]

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