I have the Guglatech neck filter on my 790 Adv. It seems like a pretty effective filter but does make filling rather slow. Firstly because the fuel has to flow through the filter under gravity. Secondly, as you fill the tank the displaced air comes out of the filler cap, but now has to flow out through the wet filter. This means as you get to the top you get a lot of frothing which slows the filling process even more. It's a hassle but for the benefit of knowing my fuel pump is protected going through the Stans I'll put up with it.
Fuel pump problems are common in that part of the world and there are plenty of stories of people burning them out, either because the upstream filter blocks so they run dry, or else because the downstream filter between the pump and injectors blocks causing the pump to run excessively high pressures. Either way avoiding dust in the pump is essential.
For this reason I've also got (but haven't yet fitted) the Guglatech filter that goes in the tank and covers the pump. Belt and braces!
|