Mopar MB415681 Sending Unit

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An incorrect reading on the fuel gauge may be due to a faulty gauge or instrument voltage stabiliser. Where this has been proved not to be the case, turn your attention to checking the transmitter in the fuel tank. Disconnect the battery and remove the spare wheel. Detach the small cover plate from the floor of the spare wheel compartment to expose the tank transmitter unit. Disconnect the electrical leads, remove the transmitter securing screws and withdraw the unit carefully from the tank. Cover the hole immediately to prevent dirt entering and fuel vapour escaping. A tester will now be required to check the resistance of the unit at various float positions. Connect the tester between the terminal on the transmitter and the unit mounting plate. With the float arm in the fully raised position, the indicated resistance should be between 14.9 and 19.1 ohms. With the float arm fully lowered the resistance should be between 113.5 and 126.5 ohms. As the float arm is moved from fully lowered to fully raised so the resistance should alter smoothly in a consistently increasing series of increments. If necessary, the float arm can be bent very gently to make the float positions agree with those.