fuel problem car losing power

can any one help

my mark one cabby seems to have a fuel starvation issue have replaced the fuel pump still the problem exist,

driving along they car stutters the revs fluctuate and u lose power its worrying me unhealthely can one help

Not sure what you have checked so far, but sounds like crud in the fuel system.

At the top of this forum is a post about cleaning the tank out good post to check.

Also do you know when the fuel filler neck was last replaced? These can look ok when you check from looking down the filler neck. But that can be very deceptive and they rot from the outside from the accumulation of crud from the road getting trapped.

Also do you have an inline filter before the pump, is that clean?