Medium and Heavy Trucks
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You should try running the engine off a 5 bucket of fuel direct to the engine bypassing all oem lines and tank. and see if the issue persists. If not acting up on the bucket of fuel suspect an issue within the fuel tank such as the stand pipe is cracked or tank is not venting properly also trace fuel lines out and check for kinks or damage, If the issue remains while running off a bucket of fuel than take the unit back to Cummins to troubleshoot under warranty.
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