on my 2004 Monaco Windsor 400ISL the fuel filters are Fleetguard FS1003 and FF5488 I buy them online and delivered right to my door I just keep a pair on hand. Sometimes the manual numbers are not correct
It appears to me that the fuel filters for the ISL CAPS (03 and before) and HPCR system (04 and later) are not quite the same. MY 04 Windsor ISL uses the filters listed by TAGWLAK above, but my owners manual incorrectly list the secondary fuel as an FS 1022? Both filters (1022 and 1003) mount fine but the electrical connection on the FS1022 is oval ;whereas, the electrical connection on the FS1003 is a larger rectangle shape. The FS1242 and FF5488 appear to be the same since both my removed, and recently purchased F1242, have both numbers on it. Changed my fuel filters filters yesterday and just another $$$ lesson learned.
PS Anyone one want an almost new FS1022 filter, that has only been filled with fresh fuel once ( I fill the filters before installation).