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Vacuum hoses on the 1200 follow a simple layout.
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Overview
1. VACUUM ADVANCE 2. CHOKE PULL-OFF
Vacuum Advance
The A12 will run good with the vacuum advance disconnected, but will run smoother and get better fuel economy with it working.
Connect a hose from the distributor to the port connection directly above the idle mixture screw.
Vacuum advance in all models uses a hose from the 'port' on the carburetor to the Distributor.
For more information, see Vacuum Advance
Carbon Canister
For late model 1200s, Tee into this line and connect a hose to the Charcoal Canister "VC" line. The canister is for the Fuel Tank vent. Since these fuel tanks are sealed, it needs to vent somewhere.
just three connections: 1. Fuel tank vent line (connection by itself) 2. PURGE - to intake manifold (bottom connector) 3. Vacuum Control (top connector) - to vacuum advance hose
Choke Pull-off
For Datsun 1200s with Automatic Choke
Choke Pull-off port, hose & diaphragm. Nissan calls this the "Vacuum Break"
This long black hose goes to the choke pull-off diaphragm (vacuum motor):
Test this diaphragm the same way as the vacuum advance.
Hopefully it won't be leaking. Again, better to plug this than have it leaking. You can drive the car with this plugged, but after a cold start it will run very rich for some time until the choke warms up a bit. It may even want to die unless you have your foot on the pedal a bit.
Only about $15 for a new one if you compare prices.
See Choke pull-off
USA
USA models have more emission controls, so a couple extra lines are used.
See:
- Emission Controls#Throttle Opener
- Emission Controls#Temperature Controlled Air Cleaner
- Fume Control (for the Flow Guide Valve details)
- TCVAS