DeLorean Workshop Manual – Section D:01:16 – Fuel, Emission and Exhaust System

 DeLorean Workshop Manual Index

SYSTEM REPAIR NOTES

  1. The majority of the fuel injection components are sealed units and cannot be adjusted or repaired. Tampering with a sealed component will automatically void the component warranty. The following guide indicates
    component serviceability and authorized repairs:

    • Fuel Pump: The fuel pump is not serviceable. The return check valve located in the fuel inlet cannot be replaced.
    • Accumulator: Not serviceable.
    • Fuel Filter: Not serviceable, replace when contaminated.
    • Mixture Control Unit:
      • Fuel Distributor: The fuel distributor can be removed from the mixture control unit for replacement. Fuel distributor is not serviceable.
      • Primary Pressure Regulator: The regulator O-ring seals’ are replaceable and the primary pressure may be adjusted by adding or subtracting spring shims.
      • Air Flow Sensor Assembly: Sensor plate and arm assembly can be centered if a binding condition exists. Rest position of sensor plate can also be adjusted.
    • Control Pressure Regulator: Not serviceable.
    • Cold Start Valve: Not serviceable.
    • Thermo-time Switch: Not serviceable.
      Fuel Injectors: Not serviceable.
      Throttle Valves: Throttle idle stop position is preset and should not be tampered with.
  2. The largest problem affecting the operation of fuel injection components is dirt and moisture contamination. Therefore, precautions should be taken when working on the system to avoid contamination.
  3. When replacing fuel lines or components, use only approved replacement parts that were designed for this system. Due to the high fuel pressures used in this system, do not attempt to splice fuel hoses.
  4. After replacing any major fuel injection component, the engine idle speed and CO level should be checked and adjusted if necessary.
  5. The RPM relay is located in the relay compartment behind the passenger seat. (See “Electrical System and Instruments” Section M).
  6. The inertia switch is located under the left side of the dash panel and is mounted to the footwell wall, adjacent to the luggage compartment cover release. When the button on the inertia switch is in the “up” position the switch is in the “open” position. In this position the fuel pump will not operate and the door locks will move to the unlock position. To reset the inertia switch, depress
    the button or move to the “down” position.
  7. Excessively high fuel pressures can be caused by a plugged fuel return line.
  8. Positive pressure buildup in the fuel tank is normal for this system.
  9. If it is necessary to adjust the CO level, the adjusting hole plug can be removed by drilling down to the hardened steel insert and threading a pulling tool into the plug.

101/541