air in fuel ?

these can be difficult to get going when there is air in the system.Have you changed the filter? or did it just start with this fault of its own accord?you could try and remove filter and fill manually with clean diesel and another option is to get a fuel pipe fitted down on the pump directly with a funnel filled with diesel and see if it will start then,if it does then refit all pipes and try again,good luck

cdc
October 2012