The '70 has a closed fuel system. There is a small tank on the top of the
trunk. If you remove all the lines and cap it all off you risk
overpressurizing your fuel system, which could result in very nasty
things. Also, it has nothing to do with smog emissions but rather with gas
vapors coming out your fuel tank. Leave it alone unless you're willing to
convert ALL of that to pre-70 stuff.
I'm not familiar with a vent on the dip stick. I don't have this on my '70
1600. However again if you're looking to reduce weight and improve
performance, something like that isn't going to do it. If the smog pump,
hoses that attach directly to it, and the air injection rail are gone, you
are pretty much de-smogged. There isn't much more to remove.
One possible performance robbing "feature" on the '70 is the float bowl
overflow to the air filter. You may want to get longer fuel hose and route
it to the ground rather than the air filter. There has been talk of the
intake creating a vacuum in the float chamber, which would impact fuel
delivery.
At 07:44 AM 8/16/2002 -0600, Brad Holmes wrote:
>Since were on SUs, I recently bought a 70 - 2000 California car that
>has been de-smogged. The PO or the pre-PO has removed much of the
>devices and plugged ports and did a recurve. There are still a bunch
>of lines running around, to and from the tank. A couple questions.
>1. Can ALL the rest of the smog equipment also be removed and lines
>and ports plugged, on the tank and in the engine room?
>2. Can the vent on the dip stick be capped off?
>3. What is/was the purpose of the "valve, fuel return assy, rear"
>next to the rear SU? (F8B-1, item 119, top left of the pic in the
>parts manual) http://www.gordon-glasgow.org/Images/8B.gif
>Can the valve be removed and a regular fitting be installed?
>
>Thanks
>Brad Holmes
>68 - 2k, Solex
>70 - 2k, SU
>SEROC
>OROC
>
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Adam Bradley
'70 Datsun 1600 Roadster SPL311-28181
'67 Datsun RL411 SSS sedan RL411-11321
'66 Datsun PL411 sedan PL411-022447
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