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Evaporative/Permeation
Emsssion Standards
Component
Permeation
Standard
(g/m2/day)
Testing
Procedure1
Fuel Tank
40 CFR 1051.51EP
(Optional 40 CFR 1( 60)
Fuel Hose
40 CFR 1051.501(cl(2)
Snowmobile
Certification
Compliance
1	May demonstrate compliance by certify-by-design approaches for
both fuel tanks and fuel hoses in (40 CFR 1051.245(e)(1) and (2))
2	Regulated items 40 CFR 1060:
	Fuel Line Permeation (1060.102)
-15 g/m2/day standard for non-cold weather fuel lines
-Separate standards for cold-weather fuel lines
	Fuel Tank Permeation (1060.103)
-1.5 g/m2/day standard at 28 degrees C, 2.5 g/m2/day stan-
dard at 40 degrees C
Disclaimer: The information in this pamphlet is not exclusive nor intended to
be a substitute or replacement of the CFR detailed regulatory requirements.
JB| Office of Transportation & Air Quality
||_ (LJrf ^ 2000 Traverwood Drive
Ann Arbor, Ml 48105
kl Mm EPA-420-F-18-021
www.epa.gov/vehicle-and-engine-certification/
certification-snowmobiles
Snowmobile Related
Regulations
40 CFR Part 1065
Engine Testing Procedures
40 CFR 1051.110
Evaporation/Permeation Standards/Test Procedures
40 CFR 1051.103
Snowmobile Emission Standards
40 CFR 1051.801 Subpart 1
Snowmobile Definition
a)	Nonroad with 4 or more wheels
b)	Seating for 2 or more people
c)	Designed for rough terrain

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How does Averaging Work?
	Establish HC and CO Family Emissions Limit (FEL) for
each engine family
	Calculate a corporate average emission level that
accounts for FEL and nationwide production volumes
	Before the model year, show that FELs and projected
production volumes meet the standard
	After the end of the model year, submit a report to
demonstrate compliance based on actual values
Over-complying allows for storing up credits for banking
or trading
	Use banked or traded credits if needed to cover a short-
fall for a given model year
 No provision for carrying a deficit forward to the
next year
What about Fuels other than
Gasoline?
	Snowmobile certification requirements apply for all
snowmobiles with spark-ignition engines
	This includes natural gas, gasoline-ethanol blends,
LPT, etc.
	Hydrocarbon standard for natual gas is NMHC;
measure and report total hydrocarbon for all others
	Diesel-fueled snowmobiles may opt into the snowmobile
standards under 40 CFR 1051 instead of being certified
to the nonroad CI standards under 40 CFR 1039
Engine Family Naming
Convention
Family
Name
Position
Description
1
Model Year Code
2-4
Manufacturer Code
5
Industry Sector Code
6-9
Engine Displacement or Family Type Descriptor1
10-12
Industry Specific Assigned Code or Manufacturer-
assigned characters used to create a unique family name2
Code
Description
Code
Description

1
2001
M
2021
2
2002
N
2022
3
2003
P
2023
4
2004
R
202.4
5
2005
S
2025
6
2006
T
2026
7
2007
V
2027
8
2008
W
2028
9
2009
X
2029
A
2.010
Y
2030
B
2011
1
2031
C
2012
2
2032
D
2013
3
2033
E
2014
4
2034
F
2015
5
2035
G
2016
6
2036
H
2017
7
2037
J
2018
8
2038
K
2019
9
2039
L
2020



1	For dual or variable displacement families, enter the maximum displace-
ment. If the displacement is given in liters, the decimal point counts as a
digit. In all cases, the displacement will be read in liters if a decimal point
is included. If there is no decimal point, it will be read in cubic inches or
cubic centimeters, except for Marine CI which will be read in liters.
2	Enter any combination of valid characters in positions 10 through 12 (or
11 through 12 as applicable) in order to provide a unique identification
for an engine family name. It is recommended that numbers and letters
be selected that minimize possible confusion. Avoid "0" and "O" and "\"
and "L"
NOTE: Include this engine family name in the subject of your emails
when applicable
Permeation Family Naming
Convention
Position
Code/
Value
Description
6-10
METAL
Metal Fuel Tank
6
P
Plastic
F
Fiberglass
7
0
No Barrier
1
Inherently Low/Zero Permeation Material
2
Continuous Multi-Layer with Permeation
Barrier
3
Non-Continuous Barrier Platelets
4
Barrier:5urface Treatment (e.g. fiuorination,
suifonation)
5
Other Permeation Control Technology
8-9
XX
For tanks with no barrier (i.e., values of 0,
1, 4, or 5 for Position 7: Control Strategy),
enter the least nominal tank wall thickness,
rounded to the nearest millimeter (mm)
XX
For tanks with a barrier (i.e., values of 2 or
3 for Position 7: Control Strategy), enter the
least weight percentage (wt.%) of barrier
material within the group of fuel tanks
10
B
Blow-Molded Tank
T
Thermoformed Tank
R
Rotational Molded Tank
J
Injection Molded Tank
O
Other Production Method
11-12
* *
Manufacturer-assigned characters us
create a unique family name
ed
to

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