Frequently Asked Questions About Peterbilt 375/377 Fuel Tank Accessories

What size fuel tanks fit the Peterbilt 375 and 377 models?

The Peterbilt 375 and 377 models typically accommodate 50 to 150-gallon aluminum or steel fuel tanks. The most common sizes are 75-gallon (23" diameter) and 100-gallon (25" diameter) tanks. Your specific truck's frame rail spacing and wheelbase configuration will determine the maximum tank diameter and length you can install. We recommend measuring your existing tank dimensions and frame clearance before ordering.

Are the fuel tank straps and brackets interchangeable between Peterbilt 375 and 377?

Yes, most fuel tank straps and mounting brackets are interchangeable between the 375 and 377 models from 1987-2007, as these trucks share the same frame rail design. However, trucks with different tank diameters require corresponding strap sizes. Always verify your tank diameter (typically 19", 23", or 25") when ordering straps. Note that some specialty configurations like wrecker bodies may have unique mounting requirements.

What's the difference between polished aluminum and steel fuel tank steps?

Polished aluminum steps are lighter weight (typically 8-10 lbs vs. 15-20 lbs for steel), won't rust, and maintain their shine with regular cleaning. Steel steps are more durable against impact damage and cost about 30-40% less, but require regular maintenance to prevent rust. Chrome-plated steel offers a middle ground with good appearance and moderate cost. For trucks in salt-heavy regions, aluminum or stainless steel options provide the best long-term value.

Do I need special tools to install fuel tank accessories on my Peterbilt 375/377?

Basic installation requires standard hand tools including 3/4" and 7/8" wrenches for most bracket bolts, and a torque wrench to properly secure straps to 45-55 ft-lbs. Some installations may require drilling mounting holes, so a quality drill with metal bits is helpful. For tank removal or replacement, you'll need a floor jack with appropriate capacity and jack stands. Always disconnect batteries and properly drain fuel before beginning any tank-related work.

Will aftermarket fuel tank covers affect my fuel gauge readings?

Quality aftermarket fuel tank covers and accessories should not affect fuel gauge readings when properly installed. The fuel sending unit, located inside the tank, operates independently of external accessories. However, ensure any tank straps or brackets don't interfere with the sending unit's wire connections at the top of the tank. If you experience gauge issues after installation, check that all electrical connections remain secure and that no accessories are creating pressure points on the tank that could affect the float mechanism.