1992 Peugeot 106 Fuel pump, fuel relay, carburetor, idle pu

The motor just stops without any warning. Starting again does not help. Start motor and the battery are ok. The problem is in electric fuel system. (1, 1 l petrol motor). Does'nt get fuel. The pump in fuel tank is ok, but there is no voltage when you turn the switch on. The relay under the ECU has been changed.

The fault has occurred several times at last years. It dissappears by itself, doesn't matter if it's in own garage or by specialist. They guess and put a new part but don't find the actual fault because the situation is ower.