Hey guys,

I'm currently trying to fix up my 1987 K100, but I'm having some trouble with the fuel tank. It was disconnected when I got the bike, and I was wondering what lines go where to reconnect the tank to the rest of the bike.

Thanks

Did you remove the pipes from the engine which go to the tank? I found that they naturally hang go towards the correct outlet on the bike.

That being as looking at the tank from the side the left hand pipe go's to the left outlet and the right to the right outlet, the pipes that are at the rear closest to the seat should be above the plastic overflow type drain....

all you need to remember is



that the fuel rail input ...tank output pipe, goes more or less straight down and is the rearward port on the tank .

twincarb wrote:Did you remove the pipes from the engine which go to the tank? I found that they naturally hang go towards the correct outlet on the bike.

That being as looking at the tank from the side the left hand pipe go's to the left outlet and the right to the right outlet, the pipes that are at the rear closest to the seat should be above the plastic overflow type drain....

I see 3 pipes: One in the left front, and two in the right back.

The left front one is where fuel gets sent to the engine, right? Does this one plug into the more forward hole or the more back one on the left side?

The back right has one thick line and one thin one. The thick one goes to a valve of sorts. Which one goes where?

Thanks a lot!

I looked at the bike today, and it seems there's a spot near the top of the engine that seems to have an opening for a fuel line on the left side of the bike. It seems like that might have to be connected to the fuel tank on the left side as one of the two, since I'm missing one as of right now.

Is this a replacement tank or the original. There are two types.

K Freak wrote:Is this a replacement tank or the original. There are two types.

I don't know . Is there a way to check? Thanks

The two types are pre and post 85 so I will presume yours is the original.

There should be 2 tubes comming out of the tank at the front left, the front one is the return line which is connected to the rubber tube that comes from the fuel pressure regulator which is behind the throttle bodies.It comes out between the radiator and the air box plannum chamber which is on top of the throttle bodies. The rear tube connects to the square fuel rail that feeds the injectors which is almost directly below the it.



There are 2 tubes on the right side about mid way point and these drain into a small rectangular shaped plastic catch tub that has a drain tube attaches to the bottom of it and goes to the rear near where the battery overflow tube is placed just to the rear of the swingarm pivot.



Hope this helps



PS The pre 85 tank had a non return valve on the front return line which was superceeded because it often caused a bad rattle and the post 85 has the return line going to the highest point of the tank to prevent return flow.