Originally Posted by stokester
Is it a question of "if" or "when" I will need a new fuel pump?
My 1983 K75S (11/92) is nearing 60K and I took care of all the filters and fluids after I bought it over 10K ago and it has given me excellent service.
After reading a thread on a possible fuel injection problem I was wondering if a fuel pump failure is something to plan for. I see Beemer Boneyard had a kit with a new vibration damper and screen for my pump.
Is this damper something that frequently deteriorates causing pump failure. With the crap fuel these days it would not surprise me that it is now a part to be replaced.
Good idea to replace it after all these years?
I can only tell you my experience.
I ran a 94 K75 from 94 to 2008 putting over 230,000 miles on it. I probably replaced the fuel pump once. I dont have the service records anymore. I dont remember thinking the fuel pump was an issue to worry about. So, the pump probably wont wear out from mileage before 100,000 miles.
I have run an 85 K100RS since 2000. It probably has the original pump in it. I havent replaced it. So, it has at most 110,000 miles and at least 60,000 miles on it. No problems with pump, screen, damper, holder or hose to date. That is 28 years or 12 years. So, age isnt necessarily a killer.
What about ethanol? It hasnt seemed to have greatly effected the pump set-up in the 85. None of my rubber parts have mysteriously dissolved or failed. I know the fuel cools the pump. If the ethanol results in the pump running at a higher temperature for some reason, that might shorten the pump`s life span. Have no data on that at all. If it also lubricates the pump, that might be an issue. I wouldnt think the pump cares what kind of liquid it is delivering...gas, diesel, water alcohol, etc. unless there are internal parts that will get eaten away from a particular liquid. As I said, not an issue for me so far on either mc.
Will the pump and related parts fail eventually? Sure, mileage and age will catch up. If you want to replace all of it now for peace of mind and keep the old stuff as back-ups, go for it. I take my chances. When the pump dies, it dies. Testing and swapping out a pump is relatively easy. If your karma is good, it will die close to civilization. You find a motel. Pay for a pump to be overnighted, swap it out and go on your way. Of couse, there will be much swearing and cursing when it happens, but its an inconvenience, not a life threatening event.