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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Posted on Jan 02, 2017

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1 Answer

When filling the gas tank gas shoots back out at me

Sounds like you have a venting problem with the breather hose.
There should be a hose coming off the neck of the gas filler pipe somewhere that relieves pressure out of the tank when you fill and when your pump sucks fuel it lets air in to balance the pressure. I would suggest this breather pipe is either bent or plugged somehow.

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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
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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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Your pick up line in the gas tank either has a hole in it or is broken. This allows the fuel pump to suck in air and loose pressure. The M.A.P. sensor will then get a wrong readimg and cause the engine to die.. You will want to replace the fuel pump while you gas tank out and open.

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