Frequently Asked Questions About Kenworth T660 Fuel Tank Senders

Will these fuel tank senders fit my specific year Kenworth T660?

Our fuel tank senders are designed to fit Kenworth T660 models from 2008 to 2016. However, compatibility can vary based on your specific tank configuration. Most T660s use either a 5-bolt pattern sender for aluminum tanks or a bayonet-style sender for plastic tanks. We recommend checking your existing sender's mounting style or calling us with your VIN for exact fitment verification.

How difficult is it to replace a fuel tank sender on a T660?

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 or twist-lock mechanism. The most challenging part is often accessing the sender on trucks with dual tanks or frame-mounted equipment. Having a second person helps when lowering the old unit and installing the new one to avoid damaging the float arm.

What's the difference between OEM and aftermarket senders for the T660?

OEM senders typically use higher-grade stainless steel components and more durable resistance strips that can last 8-10 years. Aftermarket options vary widely in quality - premium aftermarket senders use similar materials to OEM and cost about 40% less, while economy versions may use brass floats and cheaper resistance materials that can fail in 2-3 years. We carry both genuine Kenworth senders and premium aftermarket brands like Delphi and VDO that meet OEM specifications.

Why does my fuel gauge read incorrectly after installing a new sender?

Incorrect readings usually stem from three issues: mismatched ohm ranges (T660s typically use 240-33 ohm senders), bent float arms during installation, or incompatible sender depths. Some T660s with modified or aftermarket tanks require specific sender lengths - standard lengths are 12", 15", and 19". Always verify your tank depth and match the ohm range printed on your original sender. If readings are reversed (showing full when empty), the wire connections may be swapped.

How can I tell if my fuel sender is failing before it completely stops working?

Common early warning signs include erratic gauge readings when driving over bumps, the gauge sticking at certain levels (often 3/4 or 1/4 tank), slow gauge response when filling up, or the low fuel warning light triggering inconsistently. On T660s, sender failure often starts with corroded electrical connections at the tank top, which you can check without removing the sender. If you notice sulfur smell near the tank or see corrosion on the sender mounting plate, replacement is recommended even if the gauge still partially functions.