I accept that its easier to change the filter outside the tank. But using your own reasoning isn't moving it outside the tank something that really doesn't need to be done? And there's still my original concern that fuel system designers know more than me. Since it's obviously easier to change on the outside, what did BMW know leading them to put the filter inside the tank?
Originally Posted by AntonLargiader
I'm interested in your comment that the fuel lines go forever unless attacked by very old fuel. The three hoses inside my tank looked fine to the eye, even knowing that I'd had a catastrophic failure. Since the pump can output about 120 liters per hour but the engine consumes less than 40 liters per hour at maximum horsepower, there could be plenty of leaking hoses without most being able to know.
I assumed that ethanol was a contributing factor to the damage of my in-tank hoses but it could be that a prior owner had used some non-ethanol additive one winter (methanol or isopropyl based?). My point in bring that up is that in a fleet (1100/1150) of 10-20 year old motorcycles, hose failure is a bogeyman--one minute you're running, the next you're dead in the water.