05.3.29
Nissan
0
Venting
is
allowed.

(­
10.5kPa

)

­
10.5
24.5
34.5
Venting
is
allowed.



24.5kPa

)

EPA
Requirement
sec
1048.125(
e)(
1)(
i)

(
kPa
)

Pressure
in
the
fuel
tank
Venting
must
be
observed
(
24.5

34.5kPa)

UL
558
sec
26
Requirement
Prevent
Negative
Pressure
exceeding
­
10.5kPa
Shall
Vent
(
24.5

34.5kPa)

Shall
Vent
(­
10.5

­
??
kPa)


26
Requirement
on
E­
mail
'
05
March
24
advised
by
UL







To
meet
both
EPA
and
UL
Requirement
and
to
consider
the
need
of
fluctuation
of
relief
pressure
setting.

To
keep
EPA
requirement
strictly
i
id
5.0
3.5
­
1.5
(
psi
)
0
Requirement
Conflict
between
EPA
&
UL
(
1)
(

)
(

)
(

)


.

5

0.

5
No
Venting
(­
10.5

24.5kPa)
Venting
Requirement
Conflic

(
0

­
10.5kPa)

Venting
is
required
(
34.5kPa

)

Venting
is
allowed
(
10.5

24.5kPa)

No
Venting
should
occur
(
0

10.5kPa)

Some
venting
is
necessary
(
0

­
10.5kPa)
No
Venting
(­
10.5

24.5kPa)
Shall
Vent
(
24.5

34.5kPa)

Shall
Vent
(­??

­
10.5kPa)

No
Venting
(­??

24.5kPa)

(
4)







To
meet
both
EPA
and
UL
Requirement
and
to
consider
the
need
of
fluctuation
of
relief
pressure
setting.

To
keep
UL
requirement
strictly
at
negative
id
It
is
impossible
to
set
just
minus
10.5kPa
as
relief
pressure
for
venting
because
there
is
pressure
fluctuation
technically.

Then
some
realistic
range
like
positive
pressure
for
venting
will
be
necessary
like
above
3
Ideas.
Shall
Vent
(
24.5

34.5kPa)

Shall
Vent
at
(­
10.5
±
?
?
kPa)

No
Venting
(­??

24.5kPa)

(

)







To
meet
both
EPA
and
UL
Requirement
and
to
consider
the
need
of
fluctuation
of
relief
pressure
setting.

To
allow
some
fluctuation
10
5kP
EPA
says
"
No
Venting".

UL
says
"
Some
venting
is
necessary".
Requirement
Conflict
occurs.
