Warm Weather
Cold Weather
Low Vaporization Rate
High Vaporization Rate
FUEL SYSTEM / CARBURETION
4.10
Explanation of Gasoline Volatility
One of the sometimes misunderstood properties of gasoline is its volatility, or ability to vaporize at different ambi-
ent temperatures and altitudes during the year.
When gasoline is blended, it is given a Reed Vapor Pressure (RVP) number which reflects its ability to vaporize
or mix with air at a given temperature range. Gasoline vapor pressure is measured by putting a sample of fuel
inside a closed container and applying a specified amount of heat to the container for a certain amount of time.
RVP will vary from about 7.0 PSI during the summer to approximately 13.5 PSI during the colder months. Service
stations selling a large volume of fuel will normally have the correct blend to work well at all times throughout the
year in their local area.
When the weather is very cold, gasoline must be able to vaporize very quickly in order for an engine to start and
warm up properly. If summer blend fuel is being used in the winter, little or no vaporization will occur. Droplets
will form causing flooding and very hard starting.
If winter blend fuel is being used during the summer months, it may cause vapor lock (boiling fuel) inside the fuel
lines, fuel pump, or carburetor. This will cause warm engine driveability problems and hard starting when warm.
Some states are limiting the Reid Vapor number to 9.0 PSI year around to help meet evaporative emissions stan-
dards.
Maximum Reid Vapor
Ambient Air Temp. Range
Class
Pressure
Low
High
A
7.0 PSI
60
°
F
110
°
F +
B
9.0 PSI
50
°
F
110
°
F
C
10.5 PSI
40
°
F
97
°
F
D
12.0 PSI
30
°
F
85
°
F
E
13.5 PSI
20
°
F
69
°
F
Add 2.4
°
F for each 1000 feet above seal level.
Содержание 600 EDGE RMK
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