Overheated fuel = blocked fuel filter on EFI
A 'common problem' on K75/100 and K1100s has been the fuel filter being blocked (usually water and dirt).
It presents it self as bad running, when the fuel level is low and high temperatures (both ambient and engine). If you stop and wait for it to cool the problem goes away until the fuel heats up again. Or you refill the tank (fresh fuel is cooler, and more fuel gives a larger surface area to get rid of the heat). Feel the fuel temperature if you can - or look at the fuel pump in the tank - people report seeing the fuel boil
around the pump.
It should be less of a problem with CAN buss controlled fuel pumps as they won't be running flat out all the time (some 60 watts
) but if you are running hard you could end up with the same kind of problem.
Message - check the filter before spending big on a new pump. If there is 'no filter' look for wire gauze on the pump itself.
If stuck with a failed fuel pump - go to a car wreckers and get a EFI fuel pump ... while it may not 'fit' in exactly the same way .. it should work ... if not try a different car for its pump ... you should be able to find one good enough to continue.