Moeller 035722-10 Electric Sending Unit - Adjustable for 6-12 Inch Tank Depth

What Is the Moeller 035722-10 Electric Sending Unit?

The Moeller 035722-10 is a swing-arm electric fuel sending unit that gathers tank level information in the same way as a mechanical sending unit, but connects directly to a dash-mounted gauge without the need for a conversion capsule. It is designed for fuel tanks with an interior depth between 6 and 12 inches (152-305 mm), making it a practical replacement or new-installation option for a wide range of smaller marine fuel tanks.

Moeller pre-inspects every unit to guarantee a full range of calibrated readings. The sender is designed for gasoline applications, and can also be used with diesel where a separate return line is available. It is not intended for use with water tanks.

DIY-Friendly Adjustability

One of the standout qualities of this sending unit is how straightforward it is to fit to your specific tank. Rather than buying a fixed-length sender and hoping it matches your tank, you measure the interior depth of your tank and cut the bracket and float arm to the correct dimensions. The installation guide includes a float arm length chart covering tank depths from 6 inches (152 mm) through 12 inches (305 mm) in half-inch increments, so you can dial in the arm length precisely.

The float arm slides and locks into position, and the float itself is secured with push-on fasteners. Once the arm is trimmed to the correct length, the unit is ready to drop into the tank opening.

Float Rotation for Tank Wall and Baffle Clearance

Fitting a sending unit into a tank that has internal baffles or an awkward shape can be a challenge. The Moeller 035722-10 addresses this by allowing the float arm assembly to rotate in 90-degree increments. To reposition the arm, you loosen the nut at the top of the sending unit just enough to raise the mounting plate approximately 1/8 inch (3.25 mm) to clear the square, rotate the screw assembly to the desired position, and retighten the nut to 15 inch-pounds. This means you can orient the float arm to swing freely without contacting the tank wall or any internal baffles.

Industry-Standard 33-240 Ohm Calibration

The 035722-10 is calibrated to the widely used industry standard resistance range of 33-240 Ohms. This means it is compatible with the broad range of dash-mounted fuel gauges and sensors that follow this same standard, simplifying gauge selection and replacement. If you are replacing an existing sender, confirm that your current gauge operates on the 33-240 Ohm standard before purchasing.

Installation Overview

Installation involves a few straightforward steps. Begin by measuring the tank depth from the inside bottom to the outside top of the tank, then use the float arm length chart to determine the correct arm dimension. Cut the bracket at half the tank depth plus 1/2 inch (13 mm), position the float arm case on the bracket 1/4 inch (6.5 mm) from the bottom, and secure it with the provided self-tapping screws.

Slide the gasket over the float arm and mounting plate, insert the unit into the tank opening, and align the 5-hole gasket pattern with the tank. Tighten the screws just until the white sealant shows beneath the screw head - do not overtighten, as this can weaken the seal. Moeller recommends a leak test at 3 PSI using soapy water before returning fuel to the tank.

For wiring, connect the sender wire from the fuel gauge to the threaded terminal on the sender, and connect the ground wire to the 1/4-inch fasson terminal. Full wiring recommendations and the installation sheet are available as PDF downloads on the product page.

• Empty the tank of fuel and fumes completely before beginning installation.
• Keep the tank area free from sparks and open flames during installation.
• Seek professional assistance if you are unsure of any wiring connections or installation steps.

Corrosion-Resistant Construction

The internal components of the Moeller 035722-10 are designed not to rust or corrode, which is an important consideration in the marine environment where fuel tanks are exposed to moisture and condensation over time. This contributes to reliable, long-term performance without the signal drift that can occur when internal parts degrade.

What Is Included

The Moeller 035722-10 ships as a complete installation kit. Everything needed to mount the unit to the tank is included in the box.

• Swing-arm electric sending unit with adjustable bracket and float arm
• 5-hole mounting gasket
• Mounting screws

Specifications

• Tank Depth Range: 6-12 inches (152-305 mm)
• Resistance Range: 33-240 Ohms
• Float Arm Rotation Increments: 90 degrees
• Mounting Plate Clearance for Rotation: Approximately 1/8 inch (3.25 mm)
• Mounting Nut Torque: 15 inch-pounds
• Float Arm Case Position from Bottom of Bracket: 1/4 inch (6.5 mm)
• Float Outer End Clearance from Float Arm Dimension: 5/16 inch (8 mm)
• Float-to-Inner-Fastener Spacing: 1/16 inch (1.75 mm)
• Gasket Hole Pattern: 5-hole
• Ground Terminal: 1/4 inch fasson terminal
• Recommended Leak Test Pressure: 3 PSI
• Compatible Fluids: Gasoline; diesel where separate return line is available. Not for use with water.
• Included Accessories: 5-hole gasket and mounting screws

Key Features 

• Adjustable for tanks 6 to 12 inches deep: fits a wide range of smaller marine fuel tanks without needing a custom-length unit
• Trimable float arm and bracket: measure your tank once and cut to the exact length for accurate full-to-empty readings
• 90-degree float arm rotation: repositions in four orientations to clear internal tank baffles and walls
• Direct connection to dash-mounted gauge: no conversion capsule required, simplifying installation and reducing potential failure points
• 33-240 Ohm calibration: compatible with the broad range of standard marine fuel gauges
• Corrosion-resistant internal components: maintains reliable signal accuracy over the long term in the marine environment
• Complete kit out of the box: gasket and mounting screws included so installation can begin immediately
• DIY-friendly design: step-by-step installation guide and wiring recommendations available as downloadable PDFs