Hello Everyone, i'm having an issue with the main shut off solenoid located on the LP regulator. Truck serial numberA875B30777B WITH A ASIAN FUEL SYSTEM epa COMPLIANT. I changed the LP regulator because the truck would not run. After changing the regulator. The Main fuel shut off solenoid clicks at idle and service engine light flashes with the clicking. the clicking is the solenoid shutting off aand on. If i rev up to around 1800 RPM the clicking stops and light goes out and runs fine. I know some have a relay for the main shut off solenoid. not sure where this relay is located and if this truck has a relay. need help please. I replaced

fuel relay shrouded 4 pin. and engine control module still having same issue