Question

A diesel engine is hard to start, but runs good after it has been primed and run for a few minutes. The most likely cause is a:

(A) leaking injector line.
(B) leaking fuel return line.
(C) plugged fuel tank vent.
(D) bad transfer pump check valve.

Answer 1

The most likely cause for a diesel engine to be hard to start but run well after being primed and run for a few minutes is a leaking injector line.

Step-by-step explanation:

The most likely cause for a diesel engine to be hard to start but run well after being primed and run for a few minutes is a leaking injector line. When the injector line is leaking, it allows air to enter the fuel system, which causes difficulty in starting the engine. Once the engine is primed and running, the air is pushed out of the system, allowing the engine to run smoothly.