Peugeot 106 Fuel System

Ive Got A 1o6 Diesel 1.5 And At The Back Of The Fuel Pump Theres A White Bit On The Back Witch Twists Does Not Tighten Or Get Lose And...

When I Press The Accelarator A Lot Of Black Smoke Come Out Of The Exhaust,even The Sparking Plugs Are Black.i Changed The Carburattor But...

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...