Freightliner FL70-FL80 Diesel Fuel Tanks

Frequently Asked Questions About Freightliner FL70-FL80 Diesel Fuel Tanks

Will this fuel tank fit my specific Freightliner FL70 or FL80 model year?

Fuel tanks for the FL70 and FL80 series can vary by model year, cab configuration, and frame width, so it's important to check tank capacity, mounting strap spacing, and neck/outlet placement against your truck's original tank before ordering. If you're unsure about fitment, have your VIN and current tank dimensions on hand when contacting our parts specialists so we can help confirm compatibility.

What materials are these diesel fuel tanks made from, and does it affect performance?

Diesel fuel tanks for the FL70-FL80 are typically available in aluminum or steel construction. Aluminum tanks are lighter and naturally resistant to rust, which can help with fuel economy and long-term corrosion resistance, while steel tanks tend to be more rugged and budget-friendly. The right choice often comes down to your priorities around weight, durability, and cost.

How do I know what size or gallon capacity I need?

Fuel tank capacity depends on your truck's fuel usage, route length, and existing frame rail space. Measuring your current tank's length, diameter, and strap mounting points is the most reliable way to match capacity without requiring frame modifications. If you're upgrading to a larger tank, double check clearance around the frame, exhaust, and other underbody components.

Can I install a replacement fuel tank myself, or should I have a professional do it?

Installation involves draining and disconnecting the old tank, removing mounting straps, transferring or replacing fuel lines and sending units, and properly securing the new tank to the frame rails. While experienced DIYers with the right tools and lift equipment can handle this job, many customers prefer a professional shop to ensure fuel lines are sealed correctly and there are no leaks before the truck goes back on the road.

Do these fuel tanks come with mounting hardware and fittings included?

This varies by product listing, so it's worth checking the specific item description before purchasing. Some tanks ship complete with straps and mounting brackets, while others require you to reuse your existing hardware or purchase straps separately. If a listing doesn't clearly state what's included, reach out to our team and we'll confirm before you order.