Hi Olaf -I can only speak of my own moto ( F650 Dakar)-
I have a primary filter in my main tank- and I've added a washable filter before reaching the bike's OE filter and regulator. (see red and blue pic)
The fuel from the outer two fuel tanks goes through two disposable external filters before entering feeding the main tank.
It all works a treat and has never missed a beat- The investment in the washable filter made it all worthwhile as the bmw OE is some $150 a time to replace :0(
At worse, 3 filters and at best, 4! ( not counting Mr Funnel!!!)
Preventing contaminated fuel entering your tanks, if still the first and best solution and for that I chose Mr Funnel.
Maybe part of some solutions for you?
Last edited by Bertrand; 7 Nov 2015 at 23:48.
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