Instead of canisterectomy I tried

[M2Wild]

I did my DPS update last fall and missed the update to the update (2nd one) by about a week. It ran fine for a few times after that in fall temperature and soon after I put it away for the winter.

This spring Spyder ran fine when it was cold but once it gets into its normal "hot" running temp in this nice 80+ spring temp, it started to really spit and pop at lower gears and de-cel. Read up on this board and realized I needed the 2nd update to address the evap vent timing but too time consuming to take it down to the dealer and too lazy to perform the canisterectomy.

Instead, I tried a shortcut which seems to have worked so far. All I did was to plug up the "U" shaped vent hose with a bolt and secure it with a tiny hose clamp to prevent air from getting in or out. My fuel tank now will hiss a bit when I open it to refill. I think I do have a one way fuel tank valve from my SeaDoo jet laying around somewhere that I am going to put it on. This way the tank will vent its pressure but it won't allow air to flow in. Yup, that might just be the shortcut I am looking for. Hate to have the mixture richened up to kill overall gas milage.

 

[aka1004]

I did my DPS update last fall and missed the update to the update (2nd one) by about a week. It ran fine for a few times after that in fall temperature and soon after I put it away for the winter.

This spring Spyder ran fine when it was cold but once it gets into its normal "hot" running temp in this nice 80+ spring temp, it started to really spit and pop at lower gears and de-cel. Read up on this board and realized I needed the 2nd update to address the evap vent timing but too time consuming to take it down to the dealer and too lazy to perform the canisterectomy.

Instead, I tried a shortcut which seems to have worked so far. All I did was to plug up the "U" shaped vent hose with a bolt and secure it with a tiny hose clamp to prevent air from getting in or out. My fuel tank now will hiss a bit when I open it to refill. I think I do have a one way fuel tank valve from my SeaDoo jet laying around somewhere that I am going to put it on. This way the tank will vent its pressure but it won't allow air to flow in. Yup, that might just be the shortcut I am looking for. Hate to have the mixture richened up to kill overall gas milage.

when it gets hot, be careful when opening gas cap. last year when i was refueling in 100 degree weather and someone took my attention with questions and i opened gas cap quick and gas spewed out like geyser. there was a kink in hose i ran toward back of spyder and caused the pressure to build.

 

[M2Wild]

there was a kink in hose i ran toward back of spyder and caused the pressure to build.

I think this is more reason for me to go fish out that check valve and install it in place of that bolt.

 

[SpyderWolf]

That would be a good idea, and you may just need to bite the bullet so to speak and take it in for the other update. Best of luck with it.

 

[Latemarch]

The problem with check valves is that after a hot day the vacuum that develops when it cools down may just collapse your tank.:yikes:

 

[M2Wild]

The problem with check valves is that after a hot day the vacuum that develops when it cools down may just collapse your tank.:yikes:

I certainly hope not. Spyder's tank seems to be pretty beefy and valve is plastic and rubber. I also would think the low atomspheric pressure in the tank will promote the gas to evap into vapor and fill the void. But I am getting together a healthy list of things that needs to be taken care of by the dealer. So a visit in the near future is not without a question.

 

[Latemarch]

I certainly hope not. Spyder's tank seems to be pretty beefy and valve is plastic and rubber. I also would think the low atomspheric pressure in the tank will promote the gas to evap into vapor and fill the void. But I am getting together a healthy list of things that needs to be taken care of by the dealer. So a visit in the near future is not without a question.

I thought about all that when I wrote the comment.....still I remember something about collapsed tanks on BMWs in relation to the gas cannister and it occasionally producing vacuums sufficient to collapse the tank.
http://www.bmwlt.com/forums/showthread.php?t=24731

Simple to remove the canister from the vent system....suggest that instead.