Frequently Asked Questions About Peterbilt 330/335/337 Fuel Tank Accessories

What size fuel tanks and steps are compatible with my specific Peterbilt 330, 335, or 337 model year?

Peterbilt 330, 335, and 337 models from 2005-2021 typically accommodate 25", 50", and 60" diameter fuel tanks. The 330 and 335 models often use 25" tanks due to their shorter wheelbases, while the 337 can handle larger 50" or 60" tanks. Tank steps and straps are generally universal across these model years, but always verify your truck's specific tank diameter before ordering. Frame rail spacing can vary between cab configurations, so measure the distance between your frame rails to ensure proper fitment of mounting brackets.

Are these fuel tank straps and brackets made from aluminum or steel, and which is better for my application?

Most fuel tank straps for these models are available in both polished stainless steel and aluminum. Stainless steel straps offer superior corrosion resistance and strength, making them ideal for harsh weather conditions and heavy-duty applications. They typically last 15-20 years without significant deterioration. Aluminum straps are lighter weight and more affordable but may show oxidation over time. For vocational trucks exposed to road salt or chemicals, stainless steel is the recommended choice despite the higher initial cost.

How difficult is it to install fuel tank steps and straps without removing the tank?

Installing fuel tank steps typically requires 30-45 minutes per side and can be done without removing the tank. Most steps mount directly to existing frame holes or tank strap bolts. Replacing tank straps is more involved, usually requiring 2-3 hours per tank. While it's possible to replace straps without fully removing the tank, you'll need to support the tank with a jack and partially lower it to access mounting points. Having a helper makes the job significantly easier and safer. Basic hand tools and a floor jack are sufficient for most installations.

What's the difference between D-shaped and cylindrical fuel tanks for these models?

D-shaped tanks mount flush against the frame rail, maximizing ground clearance and providing a cleaner appearance. They're commonly found on 330 and 335 models used in urban delivery applications. Cylindrical tanks offer more fuel capacity in the same length and are standard on most 337 models. D-shaped tanks require specific mounting brackets and straps designed for their flat-back configuration, while cylindrical tanks use traditional round straps. Both styles are available in aluminum or steel construction, with aluminum being more common due to weight savings.

Do I need to replace fuel tank mounting bushings when installing new straps?

Yes, it's highly recommended to replace the rubber mounting bushings whenever you're installing new fuel tank straps. Original bushings typically deteriorate after 5-7 years, losing their ability to properly cushion the tank and prevent metal-to-metal contact. Worn bushings can cause premature strap failure, tank damage, and annoying squeaks or rattles. New bushing kits usually cost between $20-40 and add only 15 minutes to the installation time. This small investment significantly extends the life of both your straps and tank while eliminating vibration-related issues.