Right basically converted a mk4 mfi to efi, left the original tank in with the mfi external
pump as didnt see it being a problem and the car ran fine for ages then all of a sudden it started to hold back/jolt, miss fire and even had problems starting etc so thought it could be a blocked filter and changed it and it ran fine after that, but then a while after same problem again, so changed it again and was fine for about a week and now its starting to play up again. Any ideas as to why?! obvvious thing it looks like is filter is clogging restricting the flow but surely not that quick?! First thought is shit in the tank or pump\regulator problem?!

But one thing i need to eliminate too is, on the mfi setup theres a cylinder thing the fuel pipe from the tank goes into then goes to the filter, do the efi escorts have that too or should i remove that?! Got a pic of it so you can see, had a similar thing happen in a 2i of mine but that turned out to be the fuel pump damper which had split on the in tank pump which obviously this doesnt have, moy other thought is the mfi pump actually ok to use?! thought it would be due to it being a higher flow so shouldnt get fuel starvation unless obviously the pumps on its way out!