gas tank vapor pressure

Asked by Jan 22, 2017 at 11:28 PM about the 2014 Ford Focus SE Hatchback

Question type: General

without an evap system - would a gas tank
explode due to continuuing gas vapors
from gasoline building pressure ? trying to
understand more about how cars work
thanks  

3 Answers

145

Depends on the car and the fuel injection system it has. Tanks need to be vented, but the emissions system will close the vent and pull vapors from the charcoal canister at times. Vapors expand on hot days, as well- requiring the venting. Removing an emissions system is extremely illegal, but if you're building a race car or vintage car you may not need to retain all the equipment but there's rarely a good reason to.

100,235

No it would not explode under normal conditions, it would take a high heat source, a leak of fuel vapor and and a spark to make it blow, there was a time when fuel tanks had no real venting system, the cap was the vent, then emission systems started and through some vacuum line routing and the addition of carbon canisters those fumes were pulled from the tank and stored in the canister until the engine was fired up and then they were pulled into engine for burning along with fuel, that system was relatively simple but it did leak some fumes off into the atmosphere, so it got more complex, nowadays the fuel tanks actually have a slight vacuum on them while the car is running so there are no fumes trying too escape and the computer monitors the system.

51,815

Do a "google" search for gasoline vapor pressure. That will help you understand vapor pressure and how it varies summer to winter.

Your Answer

Focus

Looking for a Used Focus in your area?

CarGurus has 2,712 nationwide Focus listings starting at $1,100.

Postal Code:

Ford Focus Experts

  • #1
    Tom Demyan
    Reputation
    1,410
  • #2
    dandyoun
    Reputation
    1,200
  • #3
    Su'ad Barakat
    Reputation
    960
View All

Related Models For Sale

Used Ford Fusion
129 Great Deals out of 2,108 listings starting at $995
Used Honda Civic
309 Great Deals out of 3,481 listings starting at $995
Used Ford Fiesta
47 Great Deals out of 742 listings starting at $3,495
Used Chevrolet Cruze
193 Great Deals out of 4,201 listings starting at $4,948
Used Ford Mustang
7 Great Deals out of 1,156 listings starting at $2,999
Used Toyota Corolla
171 Great Deals out of 3,638 listings starting at $2,245
Used Honda Accord
73 Great Deals out of 1,084 listings starting at $1,200
Used Mazda MAZDA3
162 Great Deals out of 2,686 listings starting at $880
Used Ford Escape
198 Great Deals out of 5,580 listings starting at $1,215
Used Hyundai Elantra
186 Great Deals out of 3,355 listings starting at $2,950
Used Toyota Camry
54 Great Deals out of 1,905 listings starting at $1,688
Used Nissan Altima
73 Great Deals out of 1,310 listings starting at $2,500
Used Chevrolet Malibu
80 Great Deals out of 2,191 listings starting at $2,994
Used Volkswagen GTI
35 Great Deals out of 180 listings starting at $2,150

Used Cars For Sale

2017 Ford Focus SE Hatchback For Sale
352 listings starting at $16,790
2016 Ford Focus SE Hatchback For Sale
67 listings starting at $14,911
2015 Ford Focus SE Hatchback For Sale
89 listings starting at $11,995
2014 Ford Focus SE Hatchback For Sale
10 Great Deals out of 118 listings starting at $7,990
2013 Ford Focus SE Hatchback For Sale
8 Great Deals out of 149 listings starting at $5,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.