Replacing standard CAV with a "Racor" Fakor?

When you're doing it, give very serious consideration to fitting twin filters in parallel with taps to switch.

You'll probably never need them, but I've had a filter block. In my case, it resulted in a rather fraught entry into Portsmouth harbour under sail, but they only ever block when you really don't want them to, and I don't want even want to be swapping a spin-on filter on a nasty night while the crew's shouting that the rocks are getting closer.

There are also economies to be had in not throwing away perfectly good filters. I've changed mine twice in the 15 years since I fitted them
 
Which one did you use please
A quick search for fuel filter with primer pump came up with several, but they're all one filter, one pump. A simpler alternative for a twin filter system might be to put something like this in the line from the tank, before the Y tap.

8mm Fuel Primer Bulb Hand Pump Diesel Petrol Gas Priming Non Return Valve Car | eBay

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The screw on replacements for CAV clamp together assembly seem not to have a water trap - (looking at one on ASAP website) isn’t that the whole point of the CAV filter?
 
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