Ldv Pilot Guide What Can Cause Airlock On An Ldv Pilot Ignition System?

What can cause airlock on an ldv pilot ignition system? - ldv pilot guide

we changed the fuel filter, the truck starts is good for one or two minutes, but then the engine dies when the trap is opened (on the right side of the fuel filter), air in the fuel available. We still have the O-rings are in place and the filter is in its first housing.could faulty pump, where else the problem difficult? any ideas. Cheers, Paul