Been having this problem with our Mk 2 Vitesse. It starts fine and ticks over nicely but when driven it starts to get lumpy on acceleration and then shortly after it dies completely. New carbs have been fitted along with points, plugs, leads, distributor cap, rotor arm and condenser.
I have noticed an air bubble in the fuel line just before the fuel pump and wonder if this is the likely cause? When I manually pump it the bubble stretches but does not enter the pump so stays in place.
Any advice gratefully received.