Frequently Asked Questions About Peterbilt 567/579 Fuel Tank Senders

Will these fuel tank senders fit my specific Peterbilt 567 or 579 model year?

Most aftermarket fuel tank senders for Peterbilt 567/579 models are designed to fit trucks from 2013 onwards. However, compatibility can vary based on your tank configuration (single vs. dual tanks) and tank manufacturer (aluminum vs. steel). Always verify the sender's ohm range matches your truck's gauge cluster requirements - typically 240-33 ohms for most Peterbilt applications. Check your VIN-specific parts catalog or contact us with your truck's year and VIN for exact fitment confirmation.

What are the most common installation challenges with these fuel senders?

The primary installation challenges include accessing the top of the fuel tank (often requires dropping the tank or removing side fairings), dealing with corroded mounting hardware, and ensuring proper float arm adjustment. Many installers report difficulty with the locking ring seal - using fresh fuel-resistant sealant is crucial to prevent leaks. The wiring harness connection can be tight in some configurations, so having needle-nose pliers helps. Plan for 2-3 hours of labor if dropping the tank is required.

How do I know if my fuel sender is failing versus other gauge problems?

A failing fuel sender typically shows erratic gauge readings, stuck readings at full or empty regardless of actual fuel level, or gauge readings that change dramatically when hitting bumps. To diagnose, check the sender's resistance with a multimeter - it should show smooth resistance changes as the float moves. If readings jump or show open circuits, the sender needs replacement. Gauge cluster issues usually affect multiple gauges simultaneously, while sender problems affect only the fuel gauge.

What's the difference between OEM and aftermarket fuel senders for my Peterbilt?

OEM Peterbilt senders typically use higher-grade materials and tighter manufacturing tolerances, resulting in more accurate readings and longer service life (usually 7-10 years). Aftermarket options from reputable manufacturers like VDO or Stewart Warner offer 70-80% of OEM quality at roughly half the cost. Key differences include float arm material (stainless vs. brass), resistor board quality, and warranty coverage. Avoid ultra-cheap senders under $50 as they often fail within 12-18 months.

Can I replace just the sending unit or do I need the entire assembly?

In most cases, you can replace just the sending unit without changing the entire tank assembly. The sending unit typically includes the float, arm, and resistor board that mount to your existing tank flange. However, if your mounting flange is severely corroded or the tank opening threads are damaged, you may need the complete assembly. Inspect the rubber gasket and locking ring carefully - these are often sold separately but are critical for proper sealing and should be replaced during sender installation.