Frequently Asked Questions About Kenworth W900B/W900L Fuel Tank Senders

Will these fuel tank senders fit my specific Kenworth W900B or W900L model year?

Most aftermarket fuel tank senders for W900B/W900L models are designed to fit trucks from 1987 through current production years. However, compatibility can vary based on your specific tank configuration. W900B models typically use the same sender units as W900L trucks, but you'll need to verify your tank depth (common sizes are 24", 26", and 28") and whether you have round or D-shaped tanks. Check your existing sender's mounting pattern - most use a standard 5-bolt SAE pattern, but some older models may differ.

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

Mechanical senders use a float arm with a variable resistor and typically show 0-90 ohms or 240-33 ohms resistance ranges. Electronic senders provide digital signals for newer gauge clusters. Your truck's year determines which type you need: pre-2000 W900 models generally use mechanical senders, while 2000+ models often require electronic units. Check your dash gauge - if it shows "E" and "F" markings, you likely have a mechanical system. Digital displays indicate electronic senders.

How difficult is it to install a fuel tank sender, and what tools are required?

Installation typically takes 1-2 hours per tank. You'll need basic hand tools, a drift punch for the lock ring, and potentially a sender wrench. The main challenges include safely draining the tank (recommended below 1/4 full), removing the old lock ring without damage, and ensuring proper float arm clearance. Many customers report the lock ring removal as the toughest part - penetrating oil and gentle tapping help. Always use new gaskets and apply fuel-resistant sealant to prevent leaks.

Why is my new fuel sender giving inaccurate readings?

Common causes include incorrect ohm range for your gauge (verify 0-90 or 240-33 ohms), bent float arm during installation, or ground connection issues. The sender must be properly grounded through the tank - clean all mounting surfaces to bare metal. Some aftermarket senders require calibration by bending the float arm stops. If readings are reversed (showing full when empty), the sender's ohm range is likely opposite of what your gauge requires.

Are stainless steel senders worth the extra cost over standard units?

Stainless steel senders typically last 3-5 times longer than standard brass or aluminum units, especially important with modern ultra-low sulfur diesel and biodiesel blends that can corrode standard materials. While costing 40-60% more upfront, stainless units resist corrosion, maintain accurate readings longer, and prevent contamination from corroded parts entering your fuel system. For trucks running high miles or using alternative fuels, the investment usually pays off within 2-3 years.