Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Kia Optima Plug-In Hybrid EXFACTORY OEM SERVICE PROCEDURE
Fuel Delivery System
FUEL DELIVERY SYSTEM TIGHTENING TORQUE SPECIFICATIONS
| Item | kgf.m | N.m | lb.ft |
|---|---|---|---|
| Fuel tank mounting nut | 4.0 - 5.5 | 39.2 - 54.0 | 28.9 - 39.8 |
| Fuel pump plate cover mounting bolt | 0.2 - 0.3 | 2.0 - 2.9 | 1.4 - 2.2 |
| Filler-neck assembly mounting screw | 0.8 - 1.2 | 7.8 - 11.8 | 5.8 - 8.7 |
| Filler-neck assembly bracket mounting bolt | 0.8 - 1.2 | 7.8 - 11.8 | 5.8 - 8.7 |
| Accelerator pedal module mounting bolt | 0.9 - 1.4 | 8.8 - 13.7 | 6.5 - 10.1 |
| Delivery pipe mounting bolt | 1.9 - 2.4 | 18.6 - 23.5 | 13.7 - 17.4 |
| High pressure fuel pipe function block mounting bolt | 1.0 - 1.2 | 9.8 - 11.8 | 7.2 - 8.7 |
| High pressure fuel pump mounting bolt | 1.3 - 1.5 | 12.8 - 14.7 | 9.4 - 10.9 |
| High pressure fuel pipe flange nut | 2.7 - 3.3 | 26.5 - 32.4 | 19.5 - 23.9 |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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