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Symptoms of a problem with these parts are long cranking times when starting the engine, especially in cold weather, due to diesel draining back into the tank. This is often caused by excessively worn or perished leak off pipes. Although they are only low pressure, and they very rarely leak while the engine is running, these hoses can become worn and start to take air in when the engine is off, causing a situation where it takes a lot longer for the fuel to be drawn into the engine on cold starts. Replacing the pipe can be a very inexpensive and easy solution.

A competent mechanic, before immediately assuming it is the pump, fuel filter or tank, would check the condition of the pipes as a damaged or leaky pipe can not only affect the starting and running of the engine but also be a potential fire risk.