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When you turn the key to the on position can you hear the fuel pump turn on? If not, the fuel pump relay has gone bad. Make sure you have at least 5 gallons of fuel in the tank. Check and make sure you have fuel flow to the rail, try cracking the banjo bolt on the fuel rail.
Put at least 5 gallon of fuel in the tank. Charge the battery full with a battery charger. Turn on the ignition without starting the engine. See if you hear the pump run for a few seconds and then shut off. You may have to listen carefully in the truck to hear it. If you hear the pump it is more than likely ok. Do this about 5 times to prime the pump. Purchase a can of starter fluid and follow the directions on the can to start the engine. You may have to do this time and time again until you get fuel to the fuel rail. I would then replace the fuel filter.
the pump is part of the filter/separator not in the tank no fuel will come out if filter is removed make sure there is fuel in the upper filter if there is the pump is ok it might be an oil pressure concern
petrol?? hmm thinking about this ----if your sure that it runs on easy start then electrics ok---then it must be fuel ,right thats eliminated one thing-----now new pump and filter fitted ??is pump giving the right pressure ??was test ok.if so then ------if right pressure then its a control fault-----if not right pressure then its either pump or or non return/pressure retention valve fault.----silly question ???did you check the thin vacumn pipe that connects to the valve on the end of the common rail ,thats the bar/pipe that connects to the injectors.if this is split or porous then this will throw up the same fault.Check above out ,but without a hands on approach iam at a loss but i will think about this later as i have work in yard to do ,building an ice cream van thats demountable because of the spanish paperwork of construction and use of a vehicle.This is a silly problem as the vehicle is too old to use fancy electronics ,try looking at the thin plastic pipes and make another posting