Frequently Asked Questions About Peterbilt 330/335/337 Fuel Tank Senders

Will these fuel tank senders fit my specific Peterbilt 330, 335, or 337 model year?

Our fuel tank senders are designed to fit Peterbilt 330, 335, and 337 models from 2004 through 2018. However, compatibility can vary based on your specific tank configuration and capacity. We recommend verifying your tank dimensions and sender mounting style before ordering. Most models use either a 5-hole SAE pattern or a bayonet-style mounting system. If you're unsure, check your existing sender or contact us with your VIN for exact fitment confirmation.

What's the difference between resistive and capacitive fuel senders, and which one do I need?

Resistive senders use a float arm with variable resistance and are the most common type in Peterbilt 330/335/337 trucks manufactured before 2012. Capacitive senders use electronic sensing without moving parts and are typically found in 2012 and newer models. Check your dash gauge cluster - if you have analog gauges, you likely need a resistive sender. Digital displays usually require capacitive senders. The wrong type will cause inaccurate readings or complete gauge failure.

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

Installation typically takes 1-2 hours and requires draining the fuel tank first. You'll need a brass drift punch and hammer for bayonet-style senders, or a socket set for bolt-on types. A multimeter is essential for testing connections. Common challenges include seized lock rings on older trucks and ensuring proper float arm clearance. Always use new gaskets and apply fuel-resistant sealant to prevent leaks. Professional installation is recommended if you're not comfortable working with fuel systems.

Why is my new fuel sender giving inaccurate readings after installation?

The most common causes are incorrect ohm range (240-33 ohm vs 0-90 ohm), bent float arm during installation, or incompatible sender type. Verify your gauge cluster's ohm requirements first. Ensure the float arm moves freely without hitting tank baffles or walls. Some aftermarket senders require gauge calibration or may need resistor adjustment. If readings are reversed (showing full when empty), the sender polarity may be incorrect for your system.

What's the typical lifespan of these fuel senders, and what causes them to fail?

Quality fuel tank senders typically last 5-8 years under normal conditions. Premature failure is usually caused by contaminated fuel, water in the tank, or excessive sulfur content in diesel. Signs of impending failure include erratic gauge readings, stuck readings at certain levels, or complete gauge failure. Using fuel additives with high alcohol content can also deteriorate sender components. Regular fuel filter changes and water separator maintenance can significantly extend sender life.