It is getting fuel to the fuel filter canister. new batteries, cables, and starter. I stayed up until 3 in the morning swapping out the hpop, cam sensor, and IPR. still no start. i have been refilling the hpop reservoir. every time i do the truck starts and runs rough for ten seconds and dies. I checked my oil level on my dipstick and it rose by the amount of oil i put into the reservoir (one gallon)(also the oil level drops continuously in the oil reservoir) . could the low pressure pump not be supplying my hpop reservoir causing a lack of pressure for the injectors resulting in their inability to fire? also, the truck has 306,000 miles on it

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1996 powerstroke, diy intake, 4" exhaust, hypertech 75 horsepower chip.