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[Datsun 1200 encyclopedia]

Fuel Shut-Off System

Revision as of 12:53, 13 January 2012; view current revision
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Category: Fuel System


The Fuel Shut-Off System was introduced in some 1980 B310 USA models. It leverages the anti-diesel valve to stop the fuel flow during periods of deceleration. This is similar to what EFI systems do. It is only active at higher speeds, namely above 40mph.

1980: All California models  
1980: FED A15.MT
1981 CAL, FED, FED.MPG and CAN.MPG models. 
  Canada models did not use fuel-shut off except for 
  MPG (FU Engine) models.

For safety and good performance, the FSOS does not work unless the engine is decelerating.

  • Only works when decelerating (vacuum is high AND speed above 40mph)
  • Does not work in nuetral, so engine will not stop due to lack of fuel
  • Does not work when clutch is engaged (so you can blip the throttle)


Components are:

  • Anti-diesel valve (solenoid)
  • Vacuum valve
  • Speedometer speed switch, amplifier and relay
  • Automatic Transmission inhibitor switch
  • Manual Transmission nuetral switch
  • Clutch pedal switch

This would be an interesting system to retrofit to older models for increased fuel economy.