Little Joe Posted July 5, 2008 Posted July 5, 2008 Removed my gas tank for the first time to install new shocks. Using the Clymer manual, I dutifully followed the steps and marked the supply/return fuel lines. As I learned, this was unnecessary, because the quick connects are installed in such a way as to make crossing the fuel lines impossible. It is NOT, however, impossible to cross the vent lines, which were not mentioned in the manual (although, yes, I should have figured that out before disconnecting them, manual or no.) Couldn't find, in the Clymer manual or the shop manual, a diabram of the vent lines showing origin and destination. Now there is a 50% chance my vent lines are crossed. Buttoned up the bike and took it for a 100 mile test ride. Seems to run great. Should I ignore this issue?
DrPaul Posted July 5, 2008 Posted July 5, 2008 Look carefully at the lines. I believe you will see a subtle marking that will insure correct connection.
flars Posted July 7, 2008 Posted July 7, 2008 If you can't see any markings on them, you can figure out which goes where by blowing air down through the drain hole under the fuel filler cap. The air should come out of the hose that goes directly to the ground. The other vent line goes to the charcoal canister.
Redbrick Posted July 7, 2008 Posted July 7, 2008 The latest OTL, the magazine by the BMW Riders Association, has an article on "Fuel Tank Plumbing"...Those line are prominently mentioned and tell of the problems if they are crossed...The drain line should be marked with an "X" or a number of X's from the factory....You may have to look closely to see them...It is important that you don't have the drain line going to the canister as that can cause big problems...
OoPEZoO Posted July 7, 2008 Posted July 7, 2008 You could always do what I did.......toss your charcoal canister in the trash and run both of the hoses down behind the right side foot peg. Then it doesn't matter which is which duck....Ken is about to throw something
Redbrick Posted July 7, 2008 Posted July 7, 2008 The article in OTL mentions that Keith...We're going to to a 6M mile service on Kathy's 1150 tomorrow and one of the things I'm going to check closely is the vent line to the cannister...She's had a couple of unexplained losses of power for no apparent reason over the last couple of months and it's been suggested that this line might be the issue......
Little Joe Posted July 8, 2008 Author Posted July 8, 2008 If you can't see any markings on them, you can figure out which goes where by blowing air down through the drain hole under the fuel filler cap. The air should come out of the hose that goes directly to the ground. The other vent line goes to the charcoal canister. There is an approx. 3/16" dia. round hole in the filler neck. I shot air through it and I could clearly feel air through one of the 3 lines behind the right foot peg. Apparently everything is hooked up correctly?
Uncle Beemer Posted July 8, 2008 Posted July 8, 2008 If you can't see any markings on them, you can figure out which goes where by blowing air down through the drain hole under the fuel filler cap. The air should come out of the hose that goes directly to the ground. The other vent line goes to the charcoal canister. There is an approx. 3/16" dia. round hole in the filler neck. I shot air through it and I could clearly feel air through one of the 3 lines behind the right foot peg. Apparently everything is hooked up correctly? I would say yes.
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