Hi would a version 4 sti fuel pump be able to run a version 5 sti engine, bearing in minders the injectors are bigger arent they?

Also what are the syptons of a dogy siezed fuel pump, would running rough be one of them

cheers

 

Injectors aren't bigger.

 

thats good news

so that means the fuel pump should be ok then im guessing ?

 

Unfortunately no as 'running rough' can be caused by many things.