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You do not have to be a certified mechanic to troubleshoot a diesel engine. All you need is some mechanical aptitude and some basic tools. You have to determine what happened just before the break. This is called the line of history, is a blow by blow sequence of events that will help determine the cause of failure.

Incidentally, if your diesel engine is electronic coupling can be found a distributor who has a scanner to get codes from the system board diagnostics. But there are still checks you can do before calling the hook.

Always check the simple things first!

Engines need air and diesel fuel to operate.

This research is information that will guide you to a possible solution. You ask the driver of the vehicle of the following questions.

1. What exactly happens when the engine quit?

2. Were there any indicators or dash warning lights acting up?

3. Were there any abnormal noise?

This will help you get some clues about the factors that contribute to that might give some Troubleshooting wisdom. If the engine hesitate or lose the power that might be looking in the air in the fuel. If the engine just quit immediately be check the ignition system, fuel transfer pump and engine shutdown solenoid.

Here some basic tests that monitor with: Primarily for the state of a rough running engine before quitting.

1. Fuel tank is topped up? I know this is an issue lame, but it's happened before.

2. Is there gas in the tank instead of diesel? Once again, I've seen this happen before.

3. Check the fuel filter and make sure it is full of fuel. This determines whether you have a problem of lack of fuel or not.

4. Check for water in the fuel separator, the first filter closest to the tank. They have a bleeder valve at the bottom of the housing.

5. Check for leaking fuel lines and accessories.

6. Check the air filter for the restrictions. This will not cause a no start unless the air intake is completely blocked.

7. Sure that is receiving the fuel injection pump. Crack of a line before the injector pump and crank the engine to determine if the transfer pump Fuel is working.

8. Crack open a fuel injection line in one cylinder and crank the engine.
Are there signs pressure or a foamy substance? The latter means that there is air in the fuel.

At this time it was determined that the problem is in the system fuel. Once you drive a general theory which component is at fault you can do some research and collect some of the brains in the repair shop premises. These procedures will help you find a problem, possibly on the way, gain experience and save a few bucks.

My name is John Whelan and I have over 32 years of Heavy Duty Mechanic experience. For more tips and tricks on troubleshooting a diesel engine and other mechanical systems come on over to my Mechanic's Blog and take a tour or send me a question.

I've got a newsletter that you can join with mechanic tips & blog updates that will keep you informed and ready for your next Mechanical mishap. Send me your problems via email and I will help you out!