i put a escort rs turbo mfi engine in to a mk5 body the fuel pump on rs is external i had that runnig for a bit and it was runnig mint then i bought a syntec uprated intank fuel pump{cosworth} and now its running 15mpg and the engine is totaly standerd can sum one please help and will a set up on a rolling road be able to cure my problem i asume its the higher pressure i dont want to pay £100 on a set up and the proplem isnt solved pls pls can sum one help ASAP cheers tim