does anyone know of a way to test my fuel pump using common tools? i dont think i'm getting enough pressure. someone mentioned clamping the fuel return line in order to increase the fuel pressure....does this sound right? anyone? is there some other fuel related parts i could test? the problem is that when i drive it starts to studder and hesitate if i give it a descent amount of throttle. then most of the time it will die. but will sit and idle all day for the most part. open to suggestions, thx. W201 2.3