Hello Topcat and thanx for reply! I have also bike,Aprilia Pegaso,now i am totally in italian company hehe.
Yes,i have heard about this problem,must say.know Lucas pump from other cars,they didnt built the best pumps in the world,thats for sure.. On the other hand,it is not problem to change this system on normal mechanical pump from other cars,only it needs to be done to connect wires for shutting the engine,but for a electrician is not problem at all.
I have buy this Doblo cheap,thats why i dont ask much questions why this,why that,i just want to fix it for dont know,daily use in bad weather or for work.
JTD engine is always way better option,if i have waited for few days more,for 800 euros i could buy such Doblo with serious engine problem,but already,this normal diesel was in the garage.