Peterbilt 387 Fuel Tanks

Frequently Asked Questions About Peterbilt 387 Fuel Tanks

What size fuel tanks are available for my Peterbilt 387, and how do I know which will fit?

Peterbilt 387 trucks typically accommodate fuel tanks ranging from 80 to 150 gallons, with 100 and 120-gallon options being most common. The correct size depends on your truck's wheelbase and frame rail spacing. Model years 2000-2010 generally have 26-inch diameter tanks, while some configurations use 23-inch diameter tanks. Check your existing tank dimensions or consult your truck's spec sheet to ensure proper fitment. Dual tank setups require matching capacities for balanced weight distribution.

Are aluminum or steel fuel tanks better for my Peterbilt 387?

Aluminum tanks are lighter (reducing overall vehicle weight by 50-100 pounds per tank), resist corrosion better, and typically last 15-20 years with proper care. Steel tanks cost 20-30% less upfront but are heavier and prone to rust, especially in salt-belt states. Most owner-operators prefer aluminum for long-term savings on fuel economy and replacement costs. Steel tanks work well for local operations where weight isn't critical and initial cost matters most.

What's involved in installing a replacement fuel tank on a Peterbilt 387?

Installation typically takes 2-4 hours per tank and requires draining existing fuel, disconnecting fuel lines, sender units, and mounting straps. You'll need basic hand tools, a floor jack, and ideally a helper. Common challenges include rusted mounting brackets (especially on 2000-2005 models) and accessing upper strap bolts. New tanks often require transferring your existing sending unit, or purchasing a compatible one separately. Professional installation runs $200-400 per tank.

Do aftermarket fuel tanks affect my Peterbilt 387's warranty or resale value?

Quality aftermarket tanks from reputable manufacturers don't void warranties when properly installed and meet DOT specifications. Look for tanks with DOT certification stamps and proper venting systems. Using OEM-spec tanks typically maintains resale value, while custom or oversized tanks may limit your buyer pool. Keep installation receipts and ensure any modifications comply with federal fuel system regulations (FMVSS 301).

What are the most common fuel tank problems on Peterbilt 387s I should watch for?

The most frequent issues include cracked mounting straps (check annually), corroded fuel pickup tubes causing poor fuel flow, and faulty sending units leading to inaccurate fuel gauge readings. Tanks mounted behind the cab steps are prone to road debris damage. Models from 2003-2007 commonly develop leaks at the lower seam welds. Regular inspection of tank straps, fuel lines, and tank bottoms during oil changes can prevent costly roadside failures.