High Pressure Fuel Pump

This procedure replaces the high pressure fuel pump on a 2015 Kia Forte 1.8L I4 engine, requiring fuel system depressurization and removal of engine cover components.

Warnings

Tools required

Parts

• High pressure fuel pump assembly × 1 — Use OEM Kia specification
• High pressure fuel pump O-rings × 1 — Use OEM specification
• Fuel line O-rings × 2 — Use OEM specification
• Engine cover mounting grommets (inspect/replace) × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cold (at least 2 hours after last operation)
2. Park vehicle on level ground, engage parking brake, and place wheel chocks
3. Position Class B fire extinguisher within immediate reach
4. Disconnect negative battery cable and isolate from terminal
5. Remove engine cover by pulling upward on cover to release mounting grommets
6. Locate fuel pump fuse (fuse #18 in engine compartment fuse box) and remove it
7. Attempt to start engine and allow it to run until it stalls to depressurize fuel system
8. Crank engine for additional 5 seconds to ensure complete depressurization
9. Reinstall fuel pump fuse after depressurization
10. Place drain pan and absorbent rags under work area to catch residual fuel

Procedure

1. 1

   Verify fuel system depressurization
   Attach fuel pressure gauge to the fuel rail test port (if equipped) or loosely crack a fuel line connection while covering with a rag to verify no pressure remains. Fuel pressure must be zero before proceeding. If pressure is present, repeat depressurization procedure.
   ⚠️Even small amounts of residual pressure can spray fuel. Keep face and body clear of connection points.
2. 2

   Disconnect fuel supply line from high pressure pump
   Locate the high pressure fuel pump on the driver's side of the engine, mounted to the cylinder head. Using appropriate fuel line disconnect tool, disconnect the fuel supply line (low pressure side) from the pump inlet. Have rags ready to catch residual fuel spillage. Cap or plug the line to prevent contamination.
   ⚠Expect 1-2 ounces of fuel spillage. Keep rags in place and dispose of fuel-soaked rags properly.
3. 3

   Disconnect high pressure fuel line from pump
   Using a flare nut wrench or appropriate tool, carefully loosen and remove the high pressure fuel line fitting from the pump outlet (connects to fuel rail). This is the hard line with a threaded connection. Support the line to prevent bending. Expect additional fuel spillage. Inspect the O-ring and discard (new O-ring will be installed).
   ⚠️The high pressure line is rigid. Do not bend or kink. Damage to this line requires replacement.
   Torque spec

   Fuel Line Fittings25 Nm (18 lb-ft)
4. 4

   Disconnect electrical connector
   Press the release tab on the fuel pump electrical connector and disconnect it from the pump. Move the connector and wiring harness clear of the work area.
   ℹ️Battery should already be disconnected. Do not reconnect battery during this procedure.
5. 5

   Remove mounting bracket bolts
   Remove the two bolts securing the high pressure fuel pump mounting bracket to the cylinder head. These are typically 12mm bolts. Keep track of bolt locations as they may be different lengths.
   Torque spec

   Bracket Bolts19 Nm (14 lb-ft)
6. 6

   Remove high pressure fuel pump assembly
   Carefully withdraw the high pressure fuel pump assembly from the cylinder head. The pump drive shaft engages with the engine camshaft, so pull straight out with steady pressure. Remove and discard all O-rings from the pump body and mounting interface.
   ⚠Do not rotate the pump during removal to avoid damaging the drive mechanism or camshaft lobe.
7. 7

   Clean mounting surface and inspect
   Using clean, lint-free rags and plastic brushes, thoroughly clean the pump mounting surface on the cylinder head. Remove all debris, old O-ring material, and fuel residue. Inspect the mounting bore for damage, scoring, or contamination. Inspect the camshaft drive lobe through the opening for wear or damage. If any damage is observed, professional inspection is required before proceeding.
   ⚠Do not allow any debris to enter the cylinder head opening. Cover opening with clean shop towel when not actively working.
8. 8

   Prepare new fuel pump for installation
   Remove new high pressure fuel pump from packaging. Install new O-rings on pump body, lubricating lightly with clean engine oil (not gasoline). Ensure O-rings are properly seated in their grooves. Verify pump drive shaft rotates freely by hand. Install new O-ring on high pressure line fitting.
   ℹ️Use only new O-rings. Never reuse old O-rings on fuel system components.
9. 9

   Install high pressure fuel pump
   Align the fuel pump drive shaft with the camshaft lobe. Carefully insert the pump assembly straight into the cylinder head, ensuring the drive shaft engages properly. The pump should slide in smoothly without binding. If resistance is felt, remove and check alignment. Do not force.
   ⚠Misalignment can damage the pump drive mechanism or camshaft. Ensure proper engagement before applying any force.
10. 10

    Install mounting bracket and torque bolts
    Position the mounting bracket over the pump and install both bracket bolts hand-tight. Torque the bracket bolts in a cross pattern to specification using a calibrated torque wrench.
    Torque spec

    Bracket Bolts19 Nm (14 lb-ft)
11. 11

    Connect high pressure fuel line
    Install the high pressure fuel line to the pump outlet fitting with new O-ring in place. Thread the fitting by hand first to ensure proper thread engagement. Torque the line fitting to specification using a flare nut wrench and torque wrench. Verify O-ring is not pinched or extruding.
    ⚠️CRITICAL: This is a high pressure connection. Improper torque or damaged O-ring will cause fuel leak and potential fire. Verify torque specification carefully.
    Torque spec

    Fuel Line Fittings25 Nm (18 lb-ft)
12. 12

    Connect low pressure fuel supply line
    Connect the fuel supply line to the pump inlet using the quick-connect fitting. Ensure the fitting clicks securely into place and pull back gently to verify engagement. Install any retaining clips if equipped.
    ℹ️Quick-connect fittings must click audibly. If no click is heard, disconnect and reconnect.
13. 13

    Connect electrical connector
    Reconnect the electrical connector to the fuel pump. Ensure it clicks securely and the locking tab engages fully.
14. 14

    Pressure test fuel system
    Remove all tools and rags from engine bay. Reconnect negative battery cable. Turn ignition key to ON position (do not start) for 5 seconds, then OFF. Repeat this cycle 3-4 times to allow fuel pump to prime system and build pressure. Carefully inspect all fuel connections for any signs of leakage using a flashlight. Look for wet spots, drips, or fuel odor.
    ⚠️DO NOT START ENGINE if any fuel leak is detected. Depressurize system, identify source, and correct before proceeding.
15. 15

    Start engine and verify operation
    With fire extinguisher nearby and working in well-ventilated area, start the engine. Engine may run rough for first 10-15 seconds while air purges from high pressure system. Allow engine to idle and reach normal operating temperature. Monitor all fuel connections continuously for leaks. Check for unusual noises from fuel pump area. Verify no fuel odor or visible leaks.
    ⚠️If any fuel leak is observed, shut off engine immediately and evacuate area. Allow vapors to dissipate before investigating.

Reassembly

1. Reinstall engine cover by aligning grommets and pressing down firmly until seated
2. Inspect engine bay for any tools or rags left behind
3. Properly dispose of all fuel-soaked rags in approved metal container
4. Clean up any fuel spills with appropriate absorbent material

Verification

• With engine at operating temperature, verify smooth idle with no misfires or hesitation
• Perform a visual inspection of all fuel connections under the hood while engine is running, looking for any signs of seepage or leaks
• Check for diagnostic trouble codes using OBD-II scanner - no fuel system codes should be present
• Test drive vehicle and verify normal acceleration and power delivery with no fuel system issues
• After test drive, perform final cold inspection of all connections for delayed leaks
• Monitor fuel odor in cabin and engine bay - no fuel smell should be present during or after operation

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