the fuel filter and pump of the 1190 is the same jimmick of the 990
prefilter a PE nonwoven media (since 2010, before plastic monolayer media), inside the pump e mini impregnated paper filter, nothing more
if it's coating around the prefilter you may risk pump cavitation and over speed which wil burn it in no time
it will overheat and burn, 456euro the spare part, just for you to know
the filter set, apart from the o-ring at 40euro the pair, is roughly 70euro here in europe, dunno in the rest of the world
the system is too small for a big bore bike, period.
you should prefilter at refuelling, but the original ktm sock is the wong project, monolayer is not the way to go on fuel filtration.
a world to the wise, next time you go to your favorite tank station, get a jerry can of fuel, than let it pass throught kitchen paper, yep, that's right, two stratas of kitchen paper and check how it looks like :)
for the white gooe...... sound some kind of washing from petrol mixed to ethanol to me, either fron the tank station of from inside the tank.
petrol issue is becoming a major nuisance now that fuel injection has become so delicate