Bick Natty

There are no warning lights on and I always wait for the glow plug light to go out. It is usually not starting on a cold engine. I have two Keys that look exactly the same. There is no remote switch on either key. The bloke I brought the van off told me that he self-serviced the van himself, and I have no reason to doubt him. I have not checked the fuel filter yet.

I have recently brought a 1998 Citroen Dispatch 1.9TD with an intermittent starting problem. Occasionally the engine will turn over healthily but it will not start. If I leave it and come back later it will start again. The vehicle is fitted with a new battery. Does anyone have any idea what the problem is?