Frequently Asked Questions About GMC TopKick Truck Fuel Tank Brackets & Straps

What years and models of GMC TopKick trucks do these fuel tank brackets and straps fit?

Most universal fuel tank brackets and straps fit GMC TopKick C4500, C5500, C6500, C7500, and C8500 models from 1990-2009. However, tank sizes and mounting configurations can vary between model years and chassis configurations. We recommend checking your specific tank dimensions and mounting hole patterns before ordering. Single tank setups typically use 2-4 straps, while dual tank configurations may require 4-8 straps depending on tank size.

Are these brackets and straps made from galvanized or stainless steel to prevent rust?

Material options vary by manufacturer. Standard brackets and straps are typically made from zinc-plated steel, which offers good corrosion resistance for most applications. For severe duty or salt-belt regions, we carry stainless steel options that provide superior rust prevention. Galvanized options are also available for medium-duty corrosion resistance at a lower price point than stainless steel.

How difficult is it to replace fuel tank straps without dropping the tank?

Replacing fuel tank straps with the tank in place is possible but challenging. You'll need to support the tank with a transmission jack or wood blocks while working. Many technicians report success by loosening one strap at a time, never removing both simultaneously. The process typically takes 2-3 hours and requires basic hand tools plus a floor jack. For safety reasons, ensure the tank is less than 1/4 full before starting work.

What's the difference between J-bolt style and straight bolt mounting brackets?

J-bolt style brackets hook around the frame rail and provide easier installation without drilling, making them popular for retrofits and universal applications. Straight bolt brackets mount directly through existing frame holes and offer a more secure, OEM-style fit but require precise alignment with factory mounting points. J-bolts work well for aftermarket tank installations, while straight bolts are preferred when replacing factory brackets.

How do I know when my fuel tank straps need replacement?

Inspect your fuel tank straps during every oil change. Replace them immediately if you notice deep rust pitting, cracks in the metal, stretched or deformed strap bands, loose mounting hardware that won't stay tight, or any strap-to-tank movement when the vehicle is in motion. Most straps last 10-15 years in normal conditions but may need replacement every 5-7 years in high-salt environments.