Question about 2005 Yamaha Road Star Midnight Silverado

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Too much negitive pressure in gas tank

There is so much negitive pressure in my gas tank that it is sucking my gas tank and causing the tank to **** in and it made a dent in my tank. Also the gas cap is extremely hard to remove

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Wat kinda bike u got. if a dirtbike, u need to check and clean the inside of that hose that comes out the top of a gas cap, thats the only place were air can get it in to let the pressure out and regulate the gas going in. if its a street bike ask sumone else i dont **** with that ****

Posted on Feb 02, 2009


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If the fuel pump is inside the gas tank, remove the gas cap, to equalize the air-pressure inside/outside the gas tank. That should let the fuel pump "suck" the gas from the tank.

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I don't know much about jet skis but it sounds like its building pressure in the gas tank as you have said..Does it have the original gas cap.. Sometimes the original caps have a very small vent hole. People replace them with one that dont....if it was a car it would be called Vapor's when the pressure in the tank becomes greater then the fuel pump..Might be a little hose that goes to the carb... Supposed to burn fumes..if it's clogged it builds pressure in your tank... Something like this is going on..If you take the gas cap off and hear air sucking into tank this might be your problem..Hope this helps..

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when a tank is empty there is no fuel for the pump and the system runs low on fuel pressure Going up hill the fuel runs away from the pick up line and the pump sucks air
After filling it takes a while to empty the air out of the system to allow full pressure again. It is an extremely costly practice to run so low on fuel as it may lead to a pump replacement

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What cause gas tank to have pressure

this is normal, 100%,
if it truly is pressure and not a vacuum sound?
my wild guess , head the gas cap go whooooosh... as you unscrewed it? this pressure is normal.
the is a feature set of the EVAP system.
ask for help here
if how ever, it sucks, air called a vacuum, that means the gas cap is wrong. (for sure)
the correct cap has vacuum breaker valve inside, if missing
the gas tank will implode and engine stalls.
proof of that

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1 Answer

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