Reading the reams of coverage putting out top top the 2010 Toyota Prius, us realized we hadn"t covered one brand-new feature that corrects one irritating trouble with the predecessor, the 2004-2009 Prius hybrid.

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That to be the previously car"s fuel "bladder" gas tank, a flexible membrane that expanded and also contracted together the volume of petrol changed. That was had inside a metal shell because that rigidity and protection from road hazards, so numerous owners never ever knew it was there.

The brand-new 2010 Prius supplies a conventional, strict tank, albeit one made of lightweight reinforced resin fairly than steel.

The concept behind the bladder to be to manage evaporative emissions of gasoline fumes. In the old design, fairly than instead of the gasoline consumed with an equivalent volume the air, the bladder would shrink roughly the fuel.

But together Toyota Prius owner in cold climates learned, the bladder additionally shrank in winter weather. And the loss was substantial: even the owner"s manual warned that tank capacity could fall by as lot as 1.3 gallons in ~ 14 levels F (-10 levels C).

That"s an ext than 10 percent the the tank"s declared 11.9-gallon capacity. Part owners complained the hit was worse, speak they might only acquire 9 gallons--sometimes even less--into your tanks, severely hurting the car"s theoretical 500-mile range.


Toyota Prius gas cap

In convert to a standard rigid tank, Toyota added a typical vapor-recovery system. That brand-new hardware allows the 2010 Toyota Prius keep its rating as a low-emission auto under the state of California"s stringent standards for volatile hydrocarbon fumes.

For a finish dissection that the gas tank and bladder native a 2004-2009 Prius, see the fantastic step-by-step photography top top PriusChat, native which we have taken the liberty of take out loan the picture below.

But one last question: together we bid adieu come the bladder, have to we it is in humming "Tanks because that the memories"?


Toyota Prius gas tank bladder, from PriusChat user galaxee

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