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Apparently some are, but most are not. As Jonas posted, there is a vent on the
top of the tank; but the cap I have has what appears
to be a factory vent hole in it.
Even without the hole, I don't think they seal perfectly. The plate that
actually closes the opening has a pin going through the
middle (which carries the spring), and there is no seal where the pin
penetrates the plate. But I wouldn't rely on that to pass
enough air to allow fuel to flow to the engine.
-- Randall
_____
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of dave n
Sent: Sunday, May 10, 2015 11:45 AM
To: triumphs@autox.team.net
Subject: [TR] gas cap venting
are TR3 and TR4/a gas caps vented?
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D859010619-10052015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Apparently some are, but most are not. As =
Jonas posted,=20
there is a vent on the top of the tank; but the cap I have has what =
appears to=20
be a factory vent hole in it.</FONT></SPAN></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D859010619-10052015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial></FONT></SPAN> </DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D859010619-10052015><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Even without the hole, I don't think they seal=20
perfectly. The plate that actually closes the opening has a pin =
going=20
through the middle (which carries the spring), and there is no seal =
where the=20
pin penetrates the plate. But I wouldn't rely on that to pass =
enough air=20
to allow fuel to flow to the engine.</FONT></SPAN></DIV><!-- Converted =
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<P><FONT size=3D2>-- Randall </FONT></P>
<DIV> </DIV><BR>
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5px; MARGIN-RIGHT: 0px"=20
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<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>From:</B> Triumphs=20
[mailto:triumphs-bounces@autox.team.net] <B>On Behalf Of </B>dave=20
n<BR><B>Sent:</B> Sunday, May 10, 2015 11:45 AM<BR><B>To:</B>=20
triumphs@autox.team.net<BR><B>Subject:</B> [TR] gas cap=20
venting<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=3Dltr>
<DIV style=3D"FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: =
12pt">
<DIV>are TR3 and TR4/a gas caps=20
vented?</DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>
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