Fuel Pump problem??

Still having problems with my lads 1.0 .... I thought I had found the problem with the hesitation / lack of power when I changed the fuel filter. It went from dead to fixed instantly!!
However...... it runs great for 3-4 miles then it misfires, losing power at about 2-3K rpm.
Switch of engine, turn on ignition swith, fuel pump runs for 5 secs (as expected) start it up and away we go again .....maybe another 3-4 miles and repeat....????

Iv`e blown the fuel line out, so there aint no crud blocking the line....

I got another fuel pump / sendor unit from the scrappy, only to find the pump in the car is a little different......

Can anyone help with the diffo between these 2 pumps......
or have a suggestion fot this curious problem...

Thanks...
 
Cheers Frank..... the link you posted explains they changed 96 ish to the smaller type....the one I got from the scrappy is an earlier type ( bigger dia)

So how do I get the later one out ??.... the earlier one looks a doddle to get out...
 
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