Isuzu Cars and Trucks 1981-1991

Fuel Sending Unit

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INSPECTION

RWD I-Mark: remove the tank sending unit from the fuel tank and check the resistance between the unit terminal and ground. Move the float from E to F. The resistance varies from 103-117 ohms to 1-5 ohms when the float is moved.

FWD I-Mark: remove the tank sending unit from the fuel tank and check the resistance between the 1 and 3 terminal. Move the float from E to F. The resistance varies from 110 ohms to 3 ohms when the float is moved from E to F.

RWD Impulse: remove the tank sending unit from the tank check the voltage readings as follows. Connect the positive lead of a 12V battery to the unit terminal 5 and the negative side to terminal 3. Measure the voltage across terminals 1 and 3. At level E, the voltage at terminal 1 should be 0.6V. At level F, the voltage at terminal 1 should be 3.5V.

FWD Impulse and Stylus: remove the tank sending unit from the fuel tank and check the resistance between the 1 B-9 and 3 B-9 terminal. Move the float from E to F. The resistance varies from 110 ohms to 3 ohms when the float is moved from E to F. At half way the resistance should be 32.5 ohms.

Early P'up and Trooper: remove the tank sending unit from the fuel tank and check the resistance between the unit terminal and ground. Move the float from E to F. The resistance varies from 120 ohms to 17 ohms when the float is moved from E to F.

Late P'up, Amigo and Rodeo: remove the tank sending unit from the fuel tank and check the resistance between terminal 1 and 3. Move the float from E to F. The resistance varies from 120 ohms to 17 ohms when the float is moved from E to F. The half way resistance should be 45 ohms.



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Fig. Fuel sending unit check FWD I-Mark



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Fig. Fuel sending unit check RWD Impulse



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Fig. Fuel sending unit check FWD Impulse and Stylus



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Fig. Fuel sending unit check early P'up



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Fig. Fuel sending unit check Late model P'up, Amigo and Rodeo

 
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