Fuel tank bottom ports K75S??

[JALAIMO146577]

What are those two stubs beneath the fuel tank? I have the bike partially disassembl;ed and it runs without them being connected toanything.

[roncooper]

The front one vents the tank and the rear drains the outer cap(water). This drain is the one on the left side of the gas cap base.

Does your bike have a small plastic cup clipped to the frame rail in the area of the two pipes? This cup is a modification from BMW that uses a drain hose from the cup to the right footpeg area. If not, the cups are still available.

[JALAIMO146577]

The front one vents the tank and the rear drains the outer cap(water). This drain is the one on the left side of the gas cap base.

Does your bike have a small plastic cup clipped to the frame rail in the area of the two pipes? This cup is a modification from BMW that uses a drain hose from the cup to the right footpeg area. If not, the cups are still available.

No cup, but the two hoses canb e easily concealed.

[Carguz]

Jim,
The vents are necessary for drainage. They fit inside the a small cup that's fitted ont he frame side. If the cup is not there you may want obtain or as an option, run tubing down the frame.

[deilenberger]

I'd suggest getting the cup. BMW added it to prevent siphoning excess fuel out of the fuel tank if it was overfilled. Cost is cheap. Then you only need one hose running down to the ground.

[98lee]

http://www.maxbmwmotorcycles.com/fic...402&model=K75S



Part#5. It's called an air accumulator. $2.15. Then attach a hose to its drain port and run it to ground by the rear master cylinder.

[Craigt]

I just got my k75 a few months ago. When I tore it down for restoration, I found a lot of junk in the gas tank. Some narrow rubber tubing looked like 1/4" ID, a short piece of aluminum tubing with a bit of that same rubber tubing attached to it, lots of small fragments of dark grey epoxy, some tie wire with epoxy and the same hose attached and a 1" square piece of brass sheet metal with epoxy as well. I knew very little about this bike at the time but it seemed to me that the aluminum tubing was attached inside the top tank just behind the gas cap. I could see with a mirror where it looked like it was attached originally from the factory. My guess is that the previous owner had broken this tubing off somehow and then attempted to glue it back in place with the wire and epoxy. I also guessed that this is the tank vent. Since I could not figure how to reattach it i did nothing about it other than clean all the junk out of the tank. The bike runs fine but now after reading the other posts in this tread im wondering if I should try to fix this. Does anyone have an idea for a fix? How bad is it to ride it as is?
By the way, I am sure that this is not the cap drain. I tested the cap drain with a bit of gas in an eyedropper. Sure enough the gas went in the cap drain and out the bottom of the hose (just near the rear right footpeg).
Thanks,

Craig