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1990-1993 Volvo 240 Fuel Level Sending Unit - VDO W0133-1606446
The fuel tank sender assembly is a potentiometer that is adjusted by a float attached to a rod. When the level of fuel in the tank drops, the arm with the attached float also drops, readjusting the amount of resistance in the potentiometer. It is a simple mechanism, although all the contacts must be very clean and tight. The gauge has four electrical points. It has one terminal for battery positive, a ground, an illumination and the signal, which is the wire to the sending unit. The ground on the gauge must be good for the gauge to work right. Whenever possible, the ground should be attached to the frame. If you need to replace the fuel tank sender assembly on your 1990-1993 Volvo 240 with the VDO aftermarket parts, be sure that the replacement assembly is compatible with the gauge in terms of ohms.