Well you can open it up and clean it, which is what I did. But I believe
there is a little gasket that needs to be there, so if it is missing or torn
you have to make one.
Linda
-----Original Message-----
From: Tim <tputland@charter.net>
To: John F Sandhoff <sandhoff@csus.edu>
Cc: datsun-roadsters <datsun-roadsters@autox.team.net>
Sent: Wed, Feb 16, 2011 6:32 am
Subject: Re: [Roadsters] "sealed" fuel system questions
Just so I am clear on what I was looking for:
I was curious about the workings of that part of the fuel system. I have no
intention of removing any part of it.
What I was hoping for was maybe an explanation that might help with the rough
running I get when the car is hot (not overheating, just hot from driving) and
the gas tank has been filled.
I (wanted to last fall before my back surgery) plan on replacing the gas tank
with a freshly cleaned and sealed unit and also cleaning out the fuel lines.
Beyond this, I will be at the end of the ideas given/offered for an
explanation.
Thanks to all who replied.
Tim
---- John F Sandhoff <sandhoff@csus.edu> wrote:
=============
> What exactly is that little "valve" for right behind the rear carb on my
> 70 1600 & 2000? How does it work?
Controls fuel return to the tank. Helps prevent vapor locking in hot
weather by allowing the fuel to circulate.
> Can I remove the this valve, the fuel vapor return line and the trunk
> tank and not affect how the engine runs?
Why would you want to? Nissan added these pieces to solve a problem
(vapor locking).
> How important is it to have the gas cap seal correctly on these
> sealed systems?
A sealed gas cap is part of the emissions control. It shouldn't affect
anything, except cutting down on the release of a bit of smog-causing
volatile organic compounds.
===
Here's my general rule: except for a few distinct pieces added because
of regulations (retarded ignition timing comes to mind), the "extra"
pieces that Nissan added were done for a reason. They didn't add
that extra plumbing for the return fuel line (or the water line in the
intake manifold) just because they wanted to increase the expense
of building the car. Every part is there for a reason. Not _always_ a
good reason (fan clutch) but in my view, always figure out why it's
there, before taking it off.
My opinion, obviously.... and not meant to be taken as a scolding :-)
-- John
John F Sandhoff sandhoff@csus.edu Sacramento, CA
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