2002 C5500 8.1 power to fuel pump lost
No pwer to the fuel pump. Replaced Ignition switch, truck starts up and runs, sits for two hours. again no power to the fuel pump. Replaced oil pressure sending unit, truck starts and runs multiple times, sits for two hours again no power to the fuel pump. According to dealer from VIN number truck does not have fuel pump relay or fuel control module. I can't aford to buy the service manual. Last eight of the VIN is 2J515670. Has anyone run into this problem before?