The return line was used on the SU carbs. The Solex carbs don't use the
return line, it is just blocked off. Here is a link to Keith W's
explanation with pictures.
http://www.311s.org/phpBB2/viewtopic.php?t=4759&highlight=thermal
Here is what it says:
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That's a late 1600 setup. The fuel goes into the T closest to the camera
then out of the T with a short piece to the aluminum thermal valve on the
back carb. Out of the thermal valve a 5/16 line goes to the return line on
the firewall. The thermal valve bleeds a small amount of fuel back to the
tank till it gets hot. Then it bleeds more. The idea being to keep cooler
fuel in the system to prevent vapor lock.
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I just got the heat shield mounted on my solexes today. I also cut down
some velocity stacks to fit inside the air cleaners I am using. I have to
finish tuning up tomorrow.
Hope you make it to Nashville.
Richard.
----- Original Message -----
From: "Matthew A. Smith" <matthews517@earthlink.net>
To: <datsun-roadsters@autox.team.net>; "'Richard Brown'"
<reblues@reblues.net>
Sent: Friday, July 28, 2006 11:05 PM
Subject: FW: Fuel line issue - 70 2000 Solex
>
> Richard,
>
> OK. Now you lost me. I haven't removed the screws on those hoses so I
don't
> know what's going on there. I figured they went to the return pipe. In the
> morning I'll unplug them and see if anything comes out. If not, is that
> return line supposed to go directly from the far end (firewall end) of the
> fuel input to the return line instead of the bottom of the carbs? That
> doesn't make sense to me either. Why pump gas from the tank to the pump to
> the tank since that's where it came from? I figured the return was from an
> overflow from the carbs (those 4 little hoses). Overflow from the pump
seems
> really odd since that seems like it would be the "path of least
resistance"
> and would deprive the carbs. Maybe a smaller diameter hose, just for the
> excess and for pressure equalizaton. I also wonder about the OPPOSITE of
> vapor lock, namely siphon effect. Dunno. That's why I asked about hose ID.
> Tomorrow should be interesting.
>
> Thank you to everyone for your input,
> Matt Smith (scratching my head wondering what those engineers were
thinking)
> And Loreli (scratching her OHC head wondering the same thing!) LOL!
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