Kia Picanto JA Quiz
Engine Control System/Fuel System

Fuel Delivery System

In this manual: Engine Control System/Fuel System
General Information — 8Maintenance — 30Engine Mechanical System — 46Engine Electrical System — 14Emission Control System — 11Engine Control System/Fuel System — 46Clutch System — 12Manual Transmission — 10Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 17Brake System — 22Body (Interior and Exterior) — 104Body Electrical System — 80Heating, Ventilation, and Air Conditioning — 17
16steps
~96min
5/5difficulty
Done 0 of 16

Components and Component Location

Component Location

Fuel Tank and Filler Neck Assembly

1. Fuel Tank
2. Fuel Pump
3. Fuel Filter
4. Fuel Pressure Regulator
5. Fuel Pump Plate Cover
6. Canister
7. Fuel Level Sensor		 8. Fuel Hose
9. Balance Hose
10. Vapor Hose (Canister → Intake Manifold)
11. Vapor Hose (Canister → Fuel Tank)
12. Vapor Hose (Canister → Atmosphere)
13. Filler Neck Assembly

Fuel pump

1. Head Assembly
2. Fuel Pressure Regulator
3. Fuel Filter
4. Fuel Pump Motor
5. Pre-filter
6. Reservoir Cup		 7. Fuel Level Sensor
8. Fuel Pump Motor and Fuel Level Sensor Connector
9. Fuel Supply Port
10. Fuel Supply Tube
11. Vapor Port

Circuit Diagrams

Schematic Diagrams

Fuel Pressure Inspection (Low-Pressure System)

Fuel Pressure Inspection

  1. Release the residual pressure in the fuel line. (Refer to Fuel System - "Release Residual Pressure in Fuel Line")
  2. Install the Special Service Tool (SST).
    1. Disconnect the fuel feed hose from the injection pipe.
    2. Install the special service tool for measuring fuel pressure between the fuel supply tube and the fuel feed tube (see illustration below).
  3. Inspect for fuel leaks at the connections along the fuel supply tube, discharge tube and SST components with the ignition on.
  4. Measure the fuel pressure.
    1. Start the engine and measure fuel pressure at idle.

      Fuel pressure: 480–520 kPa (4.9–5.3 kgf/cm², 69.6–75.4 psi)

      Fuel
      Pressure      		 Cause Related Part
      Too low Clogged fuel filter Fuel filter
      Fuel leakage Fuel Pressure Regulator
      Too high Fuel pressure regulator valve stuck Fuel Pressure Regulator
    2. Stop the engine, then check the change in the fuel pressure gauge reading. Specification: the gauge reading should be maintained for approximately 5 minutes after the engine is stopped.
      Fuel Pressure
      (After Engine Stop)      		 Cause Related
      Part
      Fuel pressure drops slowly Injector leakage Injector
      Fuel pressure drops immediately Check whether the fuel pump valve is stuck in the open position. Fuel pump
    3. Turn the ignition off.
  5. Release the residual pressure in the fuel line. (Refer to Fuel System - "Release Residual Pressure in Fuel Line")
  6. End of test
    1. Remove the special service tool (SST) from the fuel feed hose and the injection pipe.
    2. Connect the fuel feed hose and the injection pipe.

Release Residual Fuel Line Pressure

Release Fuel Line Residual Pressure

  1. Turn the ignition OFF and disconnect the negative battery cable.
  2. Remove the fuel pump fuse (A).
  3. Connect the negative battery cable.
  4. Run the engine for approximately 1 minute to reduce the pressure in the low pressure line.
  5. Turn the engine off.
  6. Disconnect the low-pressure fuel line quick connector at the high-pressure pump. Use a shop towel to cover the opening and catch spilled fuel when removing the fuel line.
  7. Start the engine and let it idle until the engine stops. At this point, the pressure should be below 30 psi.
  8. Continue with the service or repair. Use a shop towel to cover the opening and collect any spilled fuel when opening the high-pressure system.
  9. Reinstall / reconnect all components in the reverse order of removal. Start the engine and check for proper operation, and make sure there are no fuel leaks.
  10. After completion, clear the DTC using the KDS diagnostic tool (the procedure described above will set a DTC).

Test yourself

A quick Kia Picanto JA quiz: every answer comes with an explanation and a link to the manual page.