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if you loose pressure in system, you obviously have a leak. you need to find the fuel leak. make sure fuel filter is seated and sealing correctly,then examine all fuel lines from tank to pump, pump to injectors and pump to tank return line. if you have ever used ether to start the diesel, the ether ruins o rings in the fuel lines.the orings now being made of some inferior material

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Q: How can I keep a 1999 Dodge 2500 Diesel from dropping fuel pressure sparatically besides replacing the lifter pump and or relay?
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