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Hi Dustin, I'm not sure if we're talking about a diesel vehicle or one with fuel injection or using a carburetor? If it has fuel injection, have the temperature sensor (with two cables) inspected for correct operation. If we're dealing with a vehicle with a carburetor, inspect the automatic choke operation. If it's diesel have the fuel filter pump housing inspected for air leakage. If it is diesel and the problem becomes more apparent, the injector pump and injectors may require repair, service and adjustment. Regards John
if this is a diesel L or L2 engine chances are you've got trapped air in the steel lines from the injection pump to the injectors
loosen- but do not remove- the fitting holding the fuel lines to the injector
start/crank the engine until fuel spurts out the loose fittings. tighten fittings.
start the engine. this will have the engine running if the problem is trapped air.
Please clarify the "loosing power" does it lose power and shut down or does it loose power but will idle? Your Cummins is electronically controlled so oil condition is important, fuel leaks, oil leaks, leaks in the air ducting between the turbo and the intake, sensors, water in the fuel. Do you get an engine light when this trouble happens? Dodge uses a lift pump to carry fuel to the the injection pump, is it working?