"Tank Lock"??
Jun 22, 2001 | 11:01 AM
#1
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Trailblazer
Joined: Sep 1999
Posts: 75
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My wife's 99 Scrambler 500 4x4 runs very well and other than a couple of incidents where she damaged wheels, a-arm, etc., it has not been a problem.
Except:
On nearly every ride where the temperature is above 70 degrees and we end up climbing an extended grade, her quad dies. It acts like it runs out of gas. After it sits for about 10 minutes, it starts right up and runs fine.
I have dissambled the carb and cleaned it, removed all the fuel lines and blown air through them and wrapped them in aluminum reflective tape. I removed the fuel line filters and made sure they are not plugged. I have replaced the fuel cap with the fuel gauge. My wife is at the point where although she likes the quad, she is nervous about riding it into a situation where it could die and leave her stranded on a steep slope.
Now I see in a post in another thread something about "tank lock". Can anyone help me with info about this?
Except:
On nearly every ride where the temperature is above 70 degrees and we end up climbing an extended grade, her quad dies. It acts like it runs out of gas. After it sits for about 10 minutes, it starts right up and runs fine.
I have dissambled the carb and cleaned it, removed all the fuel lines and blown air through them and wrapped them in aluminum reflective tape. I removed the fuel line filters and made sure they are not plugged. I have replaced the fuel cap with the fuel gauge. My wife is at the point where although she likes the quad, she is nervous about riding it into a situation where it could die and leave her stranded on a steep slope.
Now I see in a post in another thread something about "tank lock". Can anyone help me with info about this?
Jun 22, 2001 | 11:16 AM
#2
Pro Rider
Joined: Apr 2000
Posts: 1,203
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Deskbound
"Tank Lock" is a situation where the gas tank in not getting enough ventilation to compensate for the amount of gas being removed. Otherwise, the gas tank gets a vacumn and the fuel pump cannot get enough out of the gas tank to fuel the carb. Honda and others use a vented gas cap with an external hose that runs to the handlebars, thus providing ventalation. Polaris uses a smaller vent line that runs out of the top of the fuel tank and under the gas tank plastic and ultimately into the handlebars. The Polaris gas tank has a small elbow under the plastic just behind the fuel cap. I am guessing that when you are driving up an extended incline, the fuel itself is blocking the vent elbow, which limits the air from flowing into the tank. The best way to diagnose if this is the problem is when this happens, is to remove the gas cap and see if it will start back up. If so, you have tank lock. If this is the situation, I would check the vent line for any obstructions. If you cannot find any and this problem persist, I would look for an aftermarket vented gas cap. I think a few are available, just don't know where. Hope this helps.
"Tank Lock" is a situation where the gas tank in not getting enough ventilation to compensate for the amount of gas being removed. Otherwise, the gas tank gets a vacumn and the fuel pump cannot get enough out of the gas tank to fuel the carb. Honda and others use a vented gas cap with an external hose that runs to the handlebars, thus providing ventalation. Polaris uses a smaller vent line that runs out of the top of the fuel tank and under the gas tank plastic and ultimately into the handlebars. The Polaris gas tank has a small elbow under the plastic just behind the fuel cap. I am guessing that when you are driving up an extended incline, the fuel itself is blocking the vent elbow, which limits the air from flowing into the tank. The best way to diagnose if this is the problem is when this happens, is to remove the gas cap and see if it will start back up. If so, you have tank lock. If this is the situation, I would check the vent line for any obstructions. If you cannot find any and this problem persist, I would look for an aftermarket vented gas cap. I think a few are available, just don't know where. Hope this helps.
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