Rogue wave - you're a genius! Ordered the part, and a natty engine cover - all for about half the price I was quoted
The part is actually a vapour seperator, which removes any air from the fuel line. On the Suzukis, the fuel pump sits inside the vapour seperator.
Basically my unit was full of silt and grit because the previous owner obviously ran it without a filter at some point (git!). Rather than try to clean it all out and possibly miss some, it was decided to replace the whole unit. The good news was that none of this crap made it as far as the fuel rail and injectors.
In reply to the poster above, I don't think you should worry about this part failing on your own engine so long as you run it through a filter.