Quote:
Originally Posted by chrisfrank
I get an intermittent gasoline leak when I first start up the bike to go to work in the morning. It drips down from the area in the picture . Its leaks enough to create a small puddle under the bike within a minute of startup - and has forced me to drive my truck to work four times in the past month. In the picture, I've got the tank propped up with the engine running trying to recreate the leak. Of course, it only leaks when everything is reassembled. All the hoses feel tight. Any ideas?
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I went through a thrash with this, and I'll tell you what I explored and what it was.
Where you are pointing there is what I call the equalization hose, which is designed to let the fuel level equalize from one side of the tank to the other. It's held on to the tube with single-use fuel injection clamps. That's a possibility. I suspected my hose and that joint, replaced it all, and it turned out not to be the issue.
Second, you're obviously right below the fuel pump assembly and a giant o-ring joint. I'd be tempted to service the fuel filter and replace that O-ring between the plate and the tank, paying particular attention to getting even pressure on the six screws to the tank. That's my guess as to where the problem is.
Third, you can sometimes detect a small leak with spray powder deodorant. Spray it in the area of the leak, recreate the leaking situation, see if there is a telltale track through the powder.
Finally, you could have a leak in the joint there the aluminum is welded. I had a leak at a weld point in my tank as it turns out, and ended up having to replace my tank, swapping over the filler neck and cap and fuel pump. The good news is that good used tanks go by for somewhere near $100 from time to time.
More about my chronicles here:
http://forums.pelicanparts.com/bmw-r1100s-r1200s-tech-forum/608975-spruce-up-2001-1100s-light-3.html
Good luck!
N.