Date registered: Oct 2006
Vehicle: 08 115CDi, 99 A4 1.8T, 98 ZX9R, 84 GPz1100, 76 Range Rover 2dr.
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Could be the pressure regulator on the fuel rail, seems it has two small O rings which decay, causing difficulty in starting and eventual non starting. My 108CDi did same thing, I suspected air in system but was advised by independent MB van specialist to start it in Easy Start ( be careful just a 2 second blast into the air intake AFTER the air filter, it will knock like the bottom end is about to go - not nice stuff ). That started the engine allowing me to drive to specialist who fixed for an hours labour and about £10 worth of parts.
Hope this helps, but don't go mad on the Easy Start, if it will not start first attempt, wait a minute or so and try again.