Kia Optima: Fuel Delivery System / Fuel Pump Module

Kia Optima DL3 2019-2025 Service and Repair Manual / Engine Control / Fuel System / Fuel Delivery System / Fuel Pump Module

Specifications

Specification

Items		Specification
Current (A)		Max. 6.0
Supply Voltage (V)		12
Fuel Pressure	bar	3.3 - 3.7
	kPa	330 - 370
	kgf/cm²	3.365 - 3.772
	psi	47.86 - 53.66

Fuel Sender

Position	Resistance(Ω)	Capacity (ℓ)
E	297 - 305	2
1/2	80 - 84	30.7
F	14 - 16	58.3

Components and components location

Component

1. Service cover
2. Plate cover

3. Fuel pump module

Repair procedures

Inspection

The fuel delivery system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)	Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)	Sensor data : Checks the system input/output value status

(3)	Forced operation : Checks the system operating status

(4)	Additional function : Controls system options, zero point adjustment and other functions

Component Inspection

Fuel Pump

1.	Disconnect the negative battery terminal.

2.	Remove the fuel pump module.

Check motor operation by fuel pump connector (A) connecting power (4) and ground (5).

Pin	Discription
1	Fuel sender signal (+)
2	-
3	Fuel sender ground (-)
4	Fuel pump (+)
5	Fuel pump (-)

Fuel sender

1.	Disconnect the negative (-) battery terminal.

2.	Remove the fuel pump assembly.

Using an ohmmeter, measure the resistance between terminals 1 and 3 of sender connector (A) at each float level.

Pin	Discription
1	Fuel sender signal (+)
2	-
3	Fuel sender ground (-)
4	Fuel pump (+)
5	Fuel pump (-)

Also check that the resistance changes smoothly when the float moves from "E" to "F".

Position	Resistance(Ω)	Capacity (ℓ)
E	297 - 305	2
1/2	80 - 84	30.7
F	14 - 16	58.3

Removal

Release the residual pressure in fuel line.

(Refer to Fuel Delivery System - "Release Residual Pressure in Fuel Line")

When removing the fuel pump relay, a Diagnostic Trouble Code (DTC) may occur. Delete the code with the KDS after completion of "Release Residual Pressure in Fuel Line" work.

2.	Disconnect the negative battery terminal.

3.	Remove the rear seat cushion. (Refer to Body - "Rear Seat Assembly")

4.	Remove the fuel pump service cover (A).

5.	Disconnect the connectors (A, B, C). A : Fuel pump connector B : Fuel tank pressure sensor connector C : Fuel feed tube quick-connector

6.	Remove the fuel pump after removing the plate cover (A) by using the SST (09310-B8100).

Installation

1.	Install in the reverse order of removal.

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