Frequently Asked Questions About International WorkStar Fuel Tank Senders

Will these fuel tank senders fit my specific International WorkStar model year?

Our fuel tank senders are designed to fit International WorkStar trucks from 2008-2018. However, compatibility can vary based on your specific tank configuration and capacity. Most WorkStar models use either a 5-hole or 6-hole mounting pattern. Before ordering, check your existing sender's mounting bolt pattern and tank depth. If you're unsure, contact us with your VIN and we can verify the correct part for your truck.

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

Installation typically takes 1-2 hours and requires basic hand tools including a socket set, screwdrivers, and a brass drift punch for the lock ring. The main challenges are safely draining the fuel tank (recommended to be below 1/4 full) and properly aligning the sender float arm during installation. Many customers report the hardest part is removing the old lock ring if it's corroded. We recommend having a helper to support the sender unit while you tighten the lock ring.

What's the difference between OEM and aftermarket senders, and how long do they typically last?

OEM senders use higher-grade materials and tighter tolerances but cost 40-60% more than quality aftermarket options. Our aftermarket senders use upgraded sulfur-resistant float materials and improved wiring harnesses that often outlast original equipment. Most customers report 5-8 years of reliable service from our aftermarket units when properly installed, compared to 3-5 years from original WorkStar senders that commonly fail due to sulfur contamination in modern diesel fuel.

Why is my new fuel sender giving inaccurate readings, and how can I fix it?

The most common cause is incorrect float arm adjustment or using a sender with the wrong ohm range for your gauge. WorkStar trucks typically use either 0-90 ohm or 240-33 ohm senders depending on the year. Verify you have the correct ohm range for your truck. If readings are still off, check that the float arm moves freely through its full range and isn't hitting the tank walls. Some customers need to slightly bend the float arm to match their tank's dimensions.

What are the warning signs that my fuel sender is failing and needs replacement?

Common symptoms include erratic fuel gauge readings that jump around while driving, gauge stuck on full or empty regardless of actual fuel level, or intermittent gauge operation. On WorkStar trucks, sender failure often starts with inaccurate readings when the tank is below half full. If your low fuel warning light comes on with significant fuel remaining, or if you smell fuel near the tank area, these indicate seal failure and immediate replacement is recommended to prevent fuel contamination of the sender electronics.