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: 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.

Common Issue with Diesel Engine: Hard to Start but Runs Well After Priming

18 Sep 2021

Explanation:

A diesel engine that is difficult to start but runs well after being primed and run for a few minutes can be frustrating for the vehicle owner. In this case, the most likely cause of this issue is a leaking injector line.

When the injector line is leaking, it allows air to enter the fuel system, which disrupts the proper fuel-to-air ratio needed for the engine to start efficiently. This air in the fuel system can prevent the engine from starting easily, leading to the hard starting behavior. However, once the engine is primed and running, the fuel system is pressurized and the air is pushed out, allowing the engine to run smoothly.

It is important to address a leaking injector line promptly to ensure the proper functioning of the diesel engine. Ignoring this issue can lead to further problems with the engine's performance and efficiency. If you suspect a leaking injector line is causing your diesel engine to be hard to start, it is recommended to have a professional mechanic inspect and repair the issue to prevent any further complications.

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