Hyundai i20 Quiz
Engine/Fuel Control System

Repair Procedures

In this manual: Engine/Fuel Control System
General Information — 17Engine Mechanical System — 79Engine Electrical System — 50Emission Control System — 22Engine/Fuel Control System — 107Clutch System — 27MANUAL TRANSMISSION SYSTEM — 21Drive Shaft and Axle — 18Suspension System — 29Steering System — 21Restraint — 41Braking System — 53Body Work (Interior and Exterior) — 190Body Electrical System — 181Heating, Ventilation and Air Conditioning — 58
13steps
~78min
5/5difficulty
Done 0 of 13

FUEL PRESSURE INSPECTION

  1. Release residual pressure in the fuel line (refer to "Fuel Line Pressure Release" in this group).
  2. Install the Special Service Tool (SST).
    1. Disconnect the fuel supply tube from the feed tube.
    2. Install the special fuel pressure gauge between the fuel feed tubes (refer to the illustration below).
  3. Check for fuel leaks at the tube connections, fuel line, and SST components with the ignition ON.
  4. Measure Fuel Pressure
    1. Start the engine and measure fuel pressure at idle.

      Fuel pressure: 323~363 kPa (3.29~3.70 kgf/cm², 46.8~52.6 psi)

      FUEL
      PRESSURE      		 Cause Related Parts
      Too low Clogged fuel filter Fuel filter
      Fuel leakage Fuel Pressure Regulator
      Too high Clogged fuel pressure regulator valve Fuel Pressure Regulator
    2. Turn the engine OFF and check whether the fuel pressure gauge display has changed. STANDARD VALUE: When the engine is off, the Fuel Level indicator remains displayed for approx. 5 minutes.
      fuel pressure
      (After engine stop)      		 Cause Connected
      PIECE
      Fuel pressure decreases slowly Injector leakage INJECTOR
      Fuel pressure drops immediately Check whether the fuel pump check valve is blocked Fuel pump
    3. Turn the ignition switch to the OFF position.
  5. Release the residual pressure in the fuel line (refer to "Fuel Line Residual Pressure Release").
  6. End of test
    1. Remove the Special Service Tool (SST) from the feed tube in the fuel and supply pipe.
    2. Connect the fuel feed tube to the feed tube.

Fuel Line Residual Pressure Release

  1. Turn the ignition switch to the OFF position and disconnect the (-) battery cable.
  2. Remove the fuel pump fuse (A).
  3. Connect the (-) battery cable.
  4. Start the engine and let it idle, then turn the ignition switch to the OFF position after the engine stops by itself.
  5. Disconnect the (-) battery cable, then install the fuel pump relay (A).
  6. Connect the (-) battery cable.
  7. Clear the diagnostic trouble code related to the fuel pump relay using GDS.

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