Originally Posted by KarTek

It's under the fuel inlet on the fuel filter housing. The filter is secured with the 10mm bolt on the left top of the housing. Remove the bolt and the little hold-down piece of metal and the fuel line should come out. then, pry upward on the flanged black plastic piece and the whole pre-filter will slide up and out of the main filter housing.

Don't forget to either re-use the O-ring from the old filter or get a new one as the new ones may not be supplied with one which will lead to difficult/impossible starting.

Here, a picture is worth a 1000 words...



#47 and 50 are the hold-down hardware.
#26 is the pre-filter.
#29 is the infamous "missing" O-ring.