Aye bleed the fuel system mate. Depending on the age of the van, there will be a bleed valve on the filter top (bulkhead mounted) or, if the filter is mounted on top of the block, open the 8mm bleed valve on the injection pump. Either way, pump the priming bulb and expel any air thats in there, bleed valves open. Do the injection pump one last if there's more than one.
John, March 2008