Two problems related to tank mounting have been reported for the 2008 Toyota Prius. The most recently reported issues are listed below.
Gas tank does not operate as advertised and poses a potentially very serious problem for consumers who run out of gas or can't refill the tank as advertised. The gauge does not appear to work accurately and does not truly reflect the amount of gas remaining or the consumption of gas.
Fuel gauge and fuel tank report lower than expected values which lead to miscalculated trips between fill ups. On the first day, the tank reported full at around 11gallons. The second time of filling up, I could only fill up 8 gallons because the fuel pump sensor would stop at the gas station. The third, and fourth time would only allow me to put in 6 gallons, and 4 gallons. This makes it extremely inaccurate in reporting how much gas is left in the car. I nearly ran out of gas going through az for a long drive because of the inaccurate amount of reported gas. Toyota makes a european version which does not have this bladder problem. (the fuel tank capacity for a european nhw11 without the bladder is 50 litres ) why not modify or replace the american version which is clearly reports bogus gas readings? it's a serious problem when you run out of gas on the highway or overestimate to the next refueling station. Prius 2008 model, purchased 6/2008.