Technician A says that the best way to prime a diesel fuel system is to charge shop air pressure to the fuel tank and crank the engine unit it fires. Technician B says that when a fuel subsystem is fitted with an ECM-managed priming pump, this should always be used to prime the engine after a service. Who is correct? ?

Question

Quizplus · Accepted Answer

Technician B is correct because using an ECM-managed priming pump is the recommended method for priming a diesel fuel system after service, as it is designed to safely and efficiently prime the engine. Charging the fuel tank with shop air pressure, as suggested by Technician A, is not a recommended practice due to safety concerns and the potential for damaging the fuel system.

Technician a Says That the Best Way to Prime a Diesel