Frequently Asked Questions About Freightliner Cascadia 113/125 Fuel Tank Senders

Will these fuel tank senders fit my specific Cascadia model year?

Our fuel tank senders are designed to fit Freightliner Cascadia 113 and 125 models from 2008 to present. However, there are variations based on tank size (60-gallon, 80-gallon, 100-gallon, and 120-gallon configurations) and whether you have a single or dual tank setup. Always verify your tank size and configuration before ordering. The sender arm length varies by tank capacity - for example, 60-gallon tanks typically use a 12-inch arm, while 120-gallon tanks require a 24-inch arm.

How difficult is it to install a fuel tank sender, and what tools do I need?

Installation typically takes 1-2 hours per tank and requires basic hand tools including a socket set, screwdrivers, and a torque wrench. You'll need to drain the fuel tank completely before beginning. The most challenging aspect is accessing the sender unit, which requires removing the tank straps and lowering the tank partially. Many drivers recommend having a helper to support the tank during installation. Always disconnect the battery before starting and use proper fuel handling procedures.

What are the signs my fuel tank sender is failing, and which type should I buy?

Common failure symptoms include erratic fuel gauge readings, gauge stuck on empty or full, or intermittent gauge operation. Most Cascadia models use either a 5-bolt pattern sender with a 0-90 ohm resistance range or a newer style 6-bolt pattern with 240-33 ohm range. Check your existing sender's bolt pattern and ohm rating (usually stamped on the unit) before ordering. Stewart Warner and Rochester Gauges are the OEM suppliers, but aftermarket options from Dorman and Standard Motor Products offer comparable quality at lower prices.

Are aftermarket senders reliable compared to OEM, and what about warranty coverage?

Quality aftermarket senders from reputable manufacturers like Dorman, Standard Motor Products, and Delphi typically perform as well as OEM units and cost 30-50% less. These units usually feature stainless steel float arms and fuel-resistant materials. Most aftermarket senders come with a 1-year warranty, while OEM units may offer 2-year coverage. The main difference is often the connector style - some aftermarket units may require minor wiring modifications or adapter pigtails.

Can I replace just the float arm or sending unit, or do I need the complete assembly?

In many cases, you can replace just the sending unit (the electrical component) without replacing the entire pickup tube assembly, saving significant money. Float arms are also available separately if corrosion or damage is limited to that component. However, if your pickup tube shows signs of corrosion or the fuel sock is deteriorated, replacing the complete assembly is recommended. Individual sending units typically cost $40-80, while complete assemblies run $150-300 depending on tank size and configuration.