Frequently Asked Questions About Peterbilt 357/378 Fuel Tank Accessories

Will these fuel tank straps and brackets fit my specific year Peterbilt 357 or 378?

Most fuel tank accessories for Peterbilt 357 and 378 models are compatible across years 1987-2007, but there are important variations. The 357 models typically use 25-inch or 26-inch diameter tanks, while 378 models may have different mounting configurations depending on whether you have a day cab or sleeper. Always verify your tank diameter and count the mounting holes on your existing brackets before ordering. For tanks with step boxes, you'll need specific offset brackets that accommodate the step configuration.

What's the difference between aluminum and stainless steel fuel tank straps, and which should I choose?

Aluminum straps are lighter weight and resist corrosion well, making them ideal for weight-conscious applications and moderate climates. They typically cost 30-40% less than stainless options. Stainless steel straps offer superior strength and durability, especially in harsh winter conditions with road salt exposure. They maintain their appearance longer and won't pit or oxidize like aluminum can over time. For heavy-duty applications or if you want maximum longevity, stainless steel is worth the investment.

Can I install fuel tank accessories myself, or do I need special tools?

Basic fuel tank strap replacement can be done with common hand tools including wrenches, sockets, and a floor jack to support the tank. However, you'll need to safely drain and support the fuel tank, which can weigh 100-400 pounds when partially full. Many drivers successfully complete this job in 2-3 hours per side. Critical safety note: always disconnect the battery, properly ventilate the area, and use approved fuel transfer equipment. For bracket replacement involving frame mounting, you may need a drill for new holes or thread repair tools if mounting points are damaged.

What size fuel tank steps and which mounting style do I need?

Peterbilt 357/378 fuel tank steps come in two primary mounting styles: strap-mount and bracket-mount. Strap-mount steps attach directly to your fuel tank straps and work with both 25" and 26" diameter tanks. Bracket-mount steps bolt to the frame or existing tank brackets. Most models use either 13-inch or 19-inch wide steps, with the wider option providing easier cab access. Measure from your tank to the cab entry point to determine optimal step placement - typically 16-20 inches below the door threshold works best.

Why are my fuel tank straps breaking prematurely, and how can I prevent this?

Premature strap failure usually results from three issues: over-tightening during installation, corrosion from road chemicals, or excessive tank movement from worn rubber isolators. Straps should be tightened to hold the tank firmly but still allow slight movement during normal operation - typically 35-45 ft-lbs of torque. Check and replace rubber tank cushions every 3-5 years as compressed or deteriorated cushions cause metal fatigue. Apply anti-seize compound to all hardware and consider adding protective sleeves where straps contact the tank to prevent galvanic corrosion between dissimilar metals.