In reality if the filter is just a water trap it makes bugger all difference if its before or after the bulb, my SR was Rigged by the admiralty shipyard and they put the filter AFTER the bulb on the transom low down,
An old mercury manual i have shows the filter AFTER the bulb too. You have a manual that shows it before
I still maintain that in an emergengy with a partly blocked filter you can force fuel through it with the primer bulb to get you out of trouble if its before the filter,
conversley you can use the bulb as an indicator of a blockage if its the other way around it will start to collapse on WOT before it causes a problem..........
RACOR SAY....."The primer bulb can be on either side of the filter, but before the filter makes it easier to fill and prime."