Please wait for fuel door to open

[dldjtad]

Our 2011 Prius had a warning in the owner's manual not to run the tank [bladder] empty. The bladder collapses as fuel is used and an empty bladder required air pressure to expand the collasped bladder. Otherwise you couldn't get fuel in.

Does the Mav hybrid tank/bladder have the same characteristics?

From what I understand, if you do run a maverick dry, you need to put a minimum of one and a half gallons in before attempting to restart

Sponsored

 

[Aherpa]

Hmmm...

Once you pull it, you have five seconds to get rid of it . . .

 

[Decayed]

Hybrid vehicles have pressurized fuel tanks, because their internal combustion engines put a lot of pressure on the fuel system. This pressure is necessary for the fuel system to function properly.
Hybrids also have bladder fuel tanks, which are smaller than regular tanks and expand and contract as fuel is added or removed. This design reduces the amount of room for fuel to evaporate and the amount of vapor emissions released into the air.
Another reason hybrids may pressurize their fuel tanks is to keep vapor from filling the charcoal canister when the engine is not running. Without the engine running, the vapor can't be purged, so the pressure inside the tank is increased to prevent it from filling.

My Chevy Volt had a button to depressurize the tank and release the gas flap.

But why pressurize the tank? Why not just maintain fuel rail pressure with the fuel pumps?

And I get the part about vapor but that's kind of separate from the operation of the engine. The vapor should just get burned off when the engine kicks on. How is it different from the auto stop start on the ecoboost?

 

[MakinDoForNow]

Our 2011 Prius had a warning in the owner's manual not to run the tank [bladder] empty. The bladder collapses as fuel is used and an empty bladder required air pressure to expand the collasped bladder. Otherwise you couldn't get fuel in.

Does the Mav hybrid tank/bladder have the same characteristics?

Might be reason you have to use the "magic funnel" in order to add gas from anything without a filler spout. Something has to be pushed past or open.

 

[MakinDoForNow]

But why pressurize the tank? Why not just maintain fuel rail pressure with the fuel pumps?

And I get the part about vapor but that's kind of separate from the operation of the engine. The vapor should just get burned off when the engine kicks on. How is it different from the auto stop start on the ecoboost?

The pressure decreases the evaporation rate of the lighter weight volatiles in the gas and, I suspect, is used to move the vapors into the intake stream possibly through the evap canister to help keep it's internals dryer. Will help mpg and it set but but mainly to reduce vapors in tank.

 

[NeedForSteve]

But why pressurize the tank? Why not just maintain fuel rail pressure with the fuel pumps?

And I get the part about vapor but that's kind of separate from the operation of the engine. The vapor should just get burned off when the engine kicks on. How is it different from the auto stop start on the ecoboost?

Rail pressure is maintained by the pumps just like normal. The tank pressurization is purely an EVAP issue.

 

[Waterick]

But why pressurize the tank? Why not just maintain fuel rail pressure with the fuel pumps?

And I get the part about vapor but that's kind of separate from the operation of the engine. The vapor should just get burned off when the engine kicks on. How is it different from the auto stop start on the ecoboost?

The pressure decreases the evaporation rate of the lighter weight volatiles in the gas and, I suspect, is used to move the vapors into the intake stream possibly through the evap canister to help keep it's internals dryer. Will help mpg and it set but but mainly to reduce vapors in tank.

I believe I read somewhere, that because the fuel in the tank of a hybrid might be there much longer, it was to help prevent the degradation of the fuel. This could be very important with today's ethanol enhanced fuels. This would explain why the EB does not have it.

 

[MakinDoForNow]

I believe I read somewhere, that because the fuel in the tank of a hybrid might be there much longer, it was to help prevent the degradation of the fuel. This could be very important with today's ethanol enhanced fuels. This would explain why the EB does not have it.

Yes , it would Also much reduce moisture entering tank....

Sponsored