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I have a 2014 ZX-10R. I am going to give some detail just to help to diagnose. Two weeks ago I had the ECU flashed and did the block off caps on engine too. Then I also had a person paint my tank too. Anyway, It seems it is having pressure venting issues. When I get down to about 1/4 of a tank and if a try to hot rod it, then it almost acts as if it is choking and sometimes almost kills the motor and drops power quickly until i let off throttle. If i have a full tank it does not do this. I think i have isolated it to the tank is not pressuring correctly as when i stop at 1/4 a tank and open up gas tank lid you can hear the air rushing in it. I noticed apparently the guy accidentally painted over these holes in the gas tank lid. Anyway, I used a pin and was able to open up the hole on right and hole on left. Is there any other holes in gas tank lid area? I presumed the left is overfill and right is the venting one.
Even though i did this step above, the tank still starts cutting out the engine at about 1/4 of a tank and gets worse as it gets low on fuel. one time it cur out at light, had to open gas tank lid, close lid and fire up engine again. My thinking is the tank is not getting air and so the fuel pump cant get the fuel to the engine.
I have heard of some people removing from underneath the tank both of the lines, since one is an overfill and one is a venting tube. Would bike run fine without them hooked up? What else could cause the tank not venting right?
 

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I have a 2014 ZX-10R. I am going to give some detail just to help to diagnose. Two weeks ago I had the ECU flashed and did the block off caps on engine too. Then I also had a person paint my tank too. Anyway, It seems it is having pressure venting issues. When I get down to about 1/4 of a tank and if a try to hot rod it, then it almost acts as if it is choking and sometimes almost kills the motor and drops power quickly until i let off throttle. If i have a full tank it does not do this. I think i have isolated it to the tank is not pressuring correctly as when i stop at 1/4 a tank and open up gas tank lid you can hear the air rushing in it. I noticed apparently the guy accidentally painted over these holes in the gas tank lid. Anyway, I used a pin and was able to open up the hole on right and hole on left. Is there any other holes in gas tank lid area? I presumed the left is overfill and right is the venting one.
Even though i did this step above, the tank still starts cutting out the engine at about 1/4 of a tank and gets worse as it gets low on fuel. one time it cur out at light, had to open gas tank lid, close lid and fire up engine again. My thinking is the tank is not getting air and so the fuel pump cant get the fuel to the engine.
I have heard of some people removing from underneath the tank both of the lines, since one is an overfill and one is a venting tube. Would bike run fine without them hooked up? What else could cause the tank not venting right?
Have to be careful about all that stuff. CA bikes have a lot of plumbing to the tank, not sure about 49-state. Can't just unhook vent hoses as you could create a fire hazard.

My bike sometimes develops a partial vacuum in the tank, can hear it "whoosh" when I pop the cap to fill up. Never had any issues with the way it runs, the fuel pump should be able to overcome any normal pressure differential.
 
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