Stewart Warner 391C-D Fuel Level Sender - info below pulled from internet

Description:

The Stewart Warner 391C-D Fuel Level Sender is designed for use with gasoline or diesel fuel. Here are some key details about this sender:

1. Application: It is a top-mounted fuel level sender suitable for tank depths ranging from 6 inches to 12 inches¹. This means it can be used in fuel tanks with depths within that range.

2. Features:

   • Thick-Film Resistors: The sender uses thick-film resistors, which provide greater accuracy and reliability, even after more than twenty million cycles.
   • Phosphor Bronze Wiper: The wiper is made of phosphor bronze with a nickel silver contact, ensuring extended life even under fuel sloshing, vibration, and dither conditions².

3. Sender Adjustment/Installation:

   • Determine the bracket length required for your tank depth and adjust the rheostat position accordingly.
   • Cut the float arm wire to the correct length based on your tank depth.
   • Bend the wire at a right angle in the direction of the float.
   • Align the float arm with the slot in the rheostat bracket and secure it.
   • Install the fuel sender in the tank using appropriate hardware, ensuring proper sealing with a new gasket¹.

4. Resistance and Range:

   • Resistance: 240-33 Ohms
   • Range: For 15.5-24" tank depth³.