On the top of the desial pump past the filter there is a banjo type hose fitting inside that connection is a small mesh thimble type filter check to make sure it is clean if you still have troubles try getting sume clear hose and connect it to both sides of the filter and see if it is drawing air if so look for worn hose clambs or brittle hoses and last to try is get sume one to help keep the revs up and bleed each injector by loosing of pipe connections GOOD LUCK
Dave, and Clint, Sorry to butt in, but I have one of these and I had the same problem. The engine has a low oil pressure cut off switch that will exhibit the exact signs you are describing. On start up the engine wil run for a few seconds then shuts down as if you turn the key off. Check your pressure relief valve on the front of the engine ( lower right side) on the timing cover. Item number 15131. The most common problem is usually too high pressure due to this valve sticking and blowing the oil filter clean off the engine, But there have been plenty of instances of it sticking open and no oil pressure is felt at the switch, resulting in the engine continuiously shutting down. Try this and also look at the switch itself. Try Ebay item number 140293546209 for a kit.. Cheers Mark.
If you think it may be blocked in the tank good idea to drain it and check the pick up it has a gorse filter on the end and it may be blocked also you may have a bad batch of desial so try to get fresh stuff for it and also you might of got a faulty filter so i think if you could go over the hole system and try to think of other things that might be sus.