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HiCustomer Welcome to JA. I am Buddy, and i will try and help you out.
What is your fuel pressure?
What symtoms are you having?
What is your engine serial number?
SER#MBN03730 Fuel pres. From 95 down to 80 now. Came home earlier and idled up. Engine "coughed" several times until up to full idle. Makes me think with that, its sucking air some where.Pressure was 85 this morn. Supposed to be a check valve on the injector pump I could check for maybe too much return fuel?