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Discussion Starter #1
I know you guys have seen this, please point me in the right direction. I have a 2002 K1200RS with 50,000 miles. If I fill the tank up (5 gals) the bike will stall at stop signs, will not idle and will be sluggish on accelleration, and clear up in 40 miles or so. If I stop at 3/4 of a tank (3.5 gals) or less when fueling up the bike runs great. I thought it was a tank vent issue but the bike runs the same way with the fuel cap open. Please save me from leaving my bike at the dealer for a month while they guess.
 

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Could the two vent lines running up thru the fuel pump be crossed and raw fuel is being sucked into the charcoal filter??
It could easily do that if the fuel level restrictor in the fill cap has been removed from the tank.
 

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I guess it's possible. I was only in the tank once to change the fuel filter. This didn't appear to start happening until about (guess) 10 tanks of fuel later. I am willing to try anything. I will pull the fuel pump out this weekend and switch the lines around.
 

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You might not have to open the tank and get at the fuel pump etc to do that, our Canadian bikes do not have a charcoal canister, both the vent hoses coming from the top go through the fuel pump flange and exit under the bike. On a bike equipped with the charcoal canister, the hose that is connected to the tank vent goes through the canister, the other one is just the overflow for the filler cap.

Look at the parts fiche on Max Bmw , the tank vent has a "float" on it but that float also shuts the vent if the bike falls as not to spill gas. The float may have fallen off the tube, that happened to someone else but without ill effects, thus allowing fuel into the canister when the tank is full. The canister is just in front of the battery, and the third part of the system would be an "actuator" that is situated in front of the throttle bodies on the left side.

So if any of them parts are defective/disconnected or in the case of the canister full of gas, that may be your problem.

I said earlier you might not have to remove the fuel pump, only the fuel filler, you could switch the hoses right there, or see if the vent/float is there and operating normally etc....then follow the rest of the system to the canister and actuator. :thumb:
 

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Thank you, this gives me a starting point. I have read about the float coming off and have checked that, it was ok, I will check it agian and move to the vent lines and if that doesn't change things check the canister.
 

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jays said:
I guess it's possible. I was only in the tank once to change the fuel filter. This didn't appear to start happening until about (guess) 10 tanks of fuel later. I am willing to try anything. I will pull the fuel pump out this weekend and switch the lines around.
jays
Don't take the pump off!! Just swap the vent lines where they hook to the pump mounting plate.

OR, you could just check (with a little air pressure) that the line from the tank to the ground goes to the drain port up by the filler ring.
The other vent line goes from the vapor recovery gizmo inside the top of the tank to the carbon canister.
 
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