Think I have found the cause of my blocked filters. I drained the fuel from my caddy into the can I have for mower fuel and looked into the bottom of the can to see loads of rust!! I use a metal 4L can that originally had Castrol M castor in it.
That can will go in the bin and now I'm looking for anew set up using a nylon fuel can and a new pump.
The old SIG 12V gas pump is on its last legs.

LHS shop, well not so local but in this country has the Brico Fuel can system but they want $359AUD for a 10L can and pump!!!

What other good 12V pumps for petrol / gas are there? I see DA has their version which isn't that cheap either.