Got a used 2002 Foreman Rubicon, 5600 miles. I drove it tonight when we got home and after parking it in the garage I noticed a continuous noise coming from the fuel tank. After further observation I realized the fuel tank was crackling and/or bubbling possibly coming from the inside bottom the garage/house of the gas tank. What is the cause? Excessive heat? Last thing I need is a fire in the garage/house after putting it to work. Thanks!