Well, are you using low sodium fuels?

Sodium/vanadium ratios have to be right in the fuel, the "danger Zone" is conciered to be 0.15 - 0.30.

Sulpher contained in the fuel forms metallic sulphides that coat the internal surfaces of the fuel injection eqipment including fuel pumps and the injectors.

These sulphides have low shear resistence and act as EP additive commonly found in lubricating oils.

This could be causing your problems. But i guess there no way of telling how much sulpher you have in your fuel aye?

Damnit.

Well take it to a pro, there are alot of things that could have gone wrong with it.

If you wanna bring it to England i dont mind sorting it out for you on the cheap