Mazda 3 Service Manual: Fuel Gauge Sender Unit Inspection

Mazda 3 Service Manual / Engine / Cooling / Fuel Gauge Sender Unit Inspection

MZR 2.3 DISI Turbo, SKYACTIV-G 2.0

NOTE:

The fuel gauge sender unit is integrated with the fuel pump unit.

1. Disconnect the negative battery cable..

2. Remove the rear seat cushion..

3. Remove the fuel pump unit..

4. Verify that the resistance between terminals A and C of the fuel gauge sender unit based on the height of the float as shown in the figure.

If they are not as shown in the figure, replace the fuel pump unit.


Float height (mm {in})	Resistance (ohms)
165.6 {6.520}	9.5—12.5
159.3 {6.272}	20.0
130.1 {5.122}	109.4
91.3 {3.59}	194.8—222.2
52.2 {2.06}	307.6
25.7 {1.01}	400.0
20.0 {0.787}	414.5—405.5

MZR 2.0, MZR 2.5

NOTE:

The fuel gauge sender unit is integrated with the fuel pump unit.

1. Disconnect the negative battery cable..

2. Remove the rear seat cushion..

3. Remove the fuel pump unit..

4. Verify that the resistance between terminals B and D of the fuel gauge sender unit based on the height of the float as shown in the figure.

If they are not as shown in the figure, replace the fuel pump unit.


Float height (mm {in})	Resistance (ohms)
168.5 {6.634}	18—22
130.1 {5.122}	107.2—111.6
91.3 {3.59}	206—211
52.2 {2.06}	304.6—310.6
40.6 {1.60}	333.5—339.5
12.1 {0.476}	396.8—403.2

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Fuel Gauge Sender Unit Removal/Installation

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