Frequently Asked Questions About International ProStar Fuel Tank Senders

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

Our fuel tank senders are designed to fit International ProStar models from 2008-2017. However, compatibility can vary based on your specific tank configuration (single vs. dual tank systems) and tank capacity (100-150 gallon ranges). Before ordering, check your VIN plate or existing sender's part number to ensure proper fitment. Most ProStar models use either a 5-bolt or 6-bolt mounting pattern, which should match your tank's sender opening.

How difficult is it to replace a fuel tank sender on a ProStar?

Replacing a fuel tank sender typically takes 1-2 hours for someone with basic mechanical skills. You'll need to drain or pump down the fuel tank to below the sender level, disconnect the electrical connector and fuel lines, then remove the mounting bolts. The main challenges are accessing tanks mounted between frame rails and ensuring proper seal alignment during reinstallation. We recommend having a new gasket or O-ring ready, as reusing old seals often leads to leaks.

What's the difference between OEM and aftermarket senders for the ProStar?

OEM senders typically use brass or stainless steel float arms with precision-wound resistors, while aftermarket options may use aluminum components. The main differences you'll notice are in longevity and accuracy. OEM units generally last 7-10 years and maintain gauge accuracy within 1/8 tank, while quality aftermarket senders perform similarly at about 60-70% of the OEM price. Avoid budget senders under $50, as they often fail within 2-3 years due to inferior float materials that absorb diesel fuel.

Why is my new fuel sender showing incorrect readings?

Incorrect readings after installation usually stem from three issues: incompatible ohm range (ProStar typically uses 240-33 ohm senders), bent float arm during installation, or ground connection problems. First, verify your sender matches your gauge cluster's ohm requirements. Check that the float arm moves freely through its full range without hitting the tank walls. Finally, ensure the sender ground wire has a clean connection to the chassis, as poor grounding causes erratic or high readings.

How can I test if my fuel tank sender is bad before replacing it?

Test your sender using a multimeter set to resistance (ohms). Disconnect the sender wire at the tank and measure resistance between the sender terminal and ground. Move the float arm manually - you should see smooth resistance changes from approximately 240 ohms (empty) to 33 ohms (full) for most ProStar applications. If you get infinite resistance, erratic readings, or no change when moving the float, the sender needs replacement. Dead spots in the sweep indicate worn resistor boards, a common failure point after 5-7 years of use.