"
HARADA,
HIDEMI"
<
hi­
harada@
mail.
nissan.
co.
jp>
Transmission
Date:
03/
31/
2005
07:
49:
20
PM
To:
Alan
Stout/
AA/
USEPA/
US@
EPA
cc:
Subject:
RE:
Nissan)
Request
of
solution
on
gasoline
fuel
cap
"
Requirement
Conflict".

Dear
Mr.
Alan
Stout,
EPA
Thank
you
very
much
for
the
prompt
reply
on
this
matter.
We
agree
with
your
indication
to
solve
the
problem.
We
would
investigate
more
and
propose
the
limit.

Best
Regards,

H.
Harada
Unit
Planning
Section
Engineering
Department
Industrial
Machinery
Division
Nissan
Motor
Co.,
Ltd.

TEL
:
+
81­
46­
252­
3243
FAX
:
+
81­
46­
252­
3313
E­
mail
:
hi­
harada@
mail.
nissan.
co.
jp
"
HARADA,
HIDEMI"
<
hiharada
mail.
nissan.
co.
jp>
Received
Date:
03/
29/
2005
03:
26:
40
AM
Transmission
Date:
03/
29/
2005
03:
26:
40
AM
To:
Alan
Stout/
AA/
USEPA/
US@
EPA
cc:
Subject:
Nissan
Request
of
solution
on
gasoline
fuel
cap
"
Requirement
Conflict".

Dear
Mr.
Alan
Stout,
EPA
We
would
like
to
inform
the
"
Requirement
Conflict"
on
gasoline
fuel
cap
spec.
what
we
encounter.

We
received
UL's
reply
on
venting
requirement
UL558
section
26(
Fill
and
Vent
Fittings­
Self­
Closing
Type)
as
attached
because
the
paper
language
is
hard
to
understand
for
us.

As
a
result,
UL
says
"
Some
venting
is
necessary
between
0
and
­
1.5
psi
to
prevent
buildup
of
negative
pressure
in
the
tank
in
excess
of
­
1.5
psi".
On
the
other
hand,
EPA
require
"
No
venting
between
0
and
­
1.5
psi".
This
means
there
is
"
Requirement
Conflict"
between
UL
and
EPA
for
the
negative
pressure
area.

We
summarized
the
venting
requirement
on
excel
file"
SummaryOfVentingSpec
050329".
We
would
like
to
raise
the
problem
that
we
need
the
realistic
solution
like
Idea­
1,
2
or
3
to
meet
both
EPA
and
UL
requirement.
We
need
some
range
of
venting
pressure
to
consider
the
fluctuation
to
set
the
relief
pressure
technically.
We
think
this
is
not
one
company's
problem.
This
is
the
problem
of
Standards
Building.

So,
would
you
please
show
us
the
solution
on
this
issue?

Best
Regards,

H.
Harada
Unit
Planning
Section
Engineering
Department
Industrial
Machinery
Division
Nissan
Motor
Co.,
Ltd.

TEL
:
+
81­
46­
252­
3243
FAX
:
+
81­
46­
252­
3313
E­
mail
:
hi­
harada@
mail.
nissan.
co.
jp
­­­­­
Original
Message­­­­­
From:
Robert.
E.
Pence@
us.
ul.
com
[
mailto:
Robert.
E.
Pence@
us.
ul.
com]
Sent:
Thursday,
March
24,
2005
2:
38
AM
To:
HARADA,
HIDEMI
Cc:
Christopher.
James@
us.
ul.
com;
UL/
MrFrederickFiedler
(
E­
mail);
HIRATO,
HIROYUKI;
SUZUKI,
HIROSHI
Subject:
Re:
FW:
FW:
Nissan)
Request
of
UL558
section26,
venting
requirement
of
gasoline
fuel
cap
Dear
Harada­
san,

The
Standard
does
not
prohibit
the
the
cap
from
allowing
air
to
enter
the
tank
as
a
vacuum
or
negative
pressure
develops.
It
appears
that
this
must
be
allowed
between
0
psi
and
­
1.5psi
in
order
to
prevent
negative
pressure
in
the
tank
from
exceeding
­
1.5psi.
I
am
not
sure
how
this
relates
to
the
EPA
requirements,
but
our
validation
of
the
cap
operation
is
done
by
test.

My
understanding
of
the
UL
558
tests:
Venting
is
required
above
5
psi
Venting
must
be
observed
between
3.5
and
5.0
psi
Venting
is
allowed
above
1.5
psi
No
Venting
should
occur
between
0
and
1.5psi
Some
venting
is
necessary
between
0
and
­
1.5
psi
to
prevent
buildup
of
negative
pressure
in
the
tank
in
excess
of
­
1.5
psi.

Let
me
know
if
you
have
any
other
questions.

Thanks
Robert
E.
Pence,
PE
Underwriters
Laboratories,
Inc.
(
847)
272­
8800
ext.
42711
or
(
847)
664
­
2711
Fax:
(
847)
509­
6298
