A 100-gallon fuel transfer tank holds and moves large quantities of fuel between vehicles or storage

A 100-gallon fuel transfer tank is a portable container designed to store and transfer diesel, gasoline, or other fuels. It sits in or on a truck bed, connects to a fuel pump (usually electric), and lets you move fuel from one source to another—typically from a bulk supply to a vehicle's main tank. The tank itself is steel or polyethylene, baffled internally to prevent sloshing, and fitted with inlet and outlet ports plus a vent.

You use one when you need to carry fuel to a remote job site, refuel equipment in the field, or supply multiple vehicles from a single bulk purchase. Construction crews, farmers, fleet operators, and anyone working far from a fuel station rely on these tanks. The 100-gallon size is the practical middle ground: large enough to justify the cost and weight, small enough to fit a standard truck bed without special permits in most states.

Key Takeaways

  • A 100-gallon tank weighs 600 to 800 pounds when full, so your truck bed must have the payload capacity and the tank must be properly secured with straps or a frame.
  • Electric fuel pumps (12-volt or 110-volt) are standard and run off your truck battery or a generator, though manual hand pumps are cheaper and require no power.
  • Steel tanks last longer but rust without maintenance; polyethylene tanks resist corrosion but can crack if overfilled or exposed to extreme heat.
  • Fuel transfer tanks are legal to own and operate, but state and local rules vary on transport distance, placarding, and where you can store them on your property.
  • Cost ranges from $400 to $1,200 depending on material, pump type, and whether the tank includes a frame or mounting hardware.

Tank material: steel versus polyethylene

Steel tanks are heavier, more durable, and resist punctures better than plastic. They handle temperature swings without warping and last 15 to 20 years with basic maintenance—wiping the exterior dry after rain and checking for surface rust. The trade-off is that steel rusts if you don't keep it painted or sealed, and rust can eventually leak into your fuel. If you store the tank outdoors year-round or in a humid climate, plan on touching up paint every two to three years.

Polyethylene (plastic) tanks weigh less, never rust, and cost $100 to $300 less than steel. They're easier to move and install. The downside is that they're softer—a sharp rock or a dropped tool can crack them—and they can become brittle in extreme cold or warp if left in direct sun for months. Polyethylene tanks also have a lower temperature tolerance; fuel stored in a plastic tank in a hot truck bed can expand and overflow if the tank is filled to the brim. Most manufacturers recommend leaving 5 to 10 percent headspace in a plastic tank to account for thermal expansion.

Pump types and power requirements

Electric pumps are the standard choice. A 12-volt DC pump draws power directly from your truck battery and transfers fuel at 10 to 15 gallons per minute—fast enough for most field refueling. A 110-volt AC pump plugs into a generator and moves fuel at 20 to 40 gallons per minute, making it better for high-volume transfers or if you're running the pump for extended periods and don't want to drain your truck battery.

Manual hand pumps cost $50 to $150 and require no electricity. You crank a handle to draw fuel, which is slower (5 to 8 gallons per minute) but reliable and useful as a backup if your electric pump fails. Many operators keep a hand pump on the tank even if they primarily use an electric one.

All pumps come with suction and discharge hoses. Check that the hose diameter matches your vehicle's fuel inlet—most trucks use 5/8-inch or 3/4-inch hose. Hoses degrade over time, especially if exposed to sun and heat, so inspect them before each use and replace them every three to five years or if you see cracks or soft spots.

Mounting and truck bed requirements

A full 100-gallon tank of diesel weighs approximately 660 pounds; gasoline is slightly lighter at around 600 pounds. Your truck's payload capacity (found on the driver's door jamb or in the owner's manual) must exceed this weight plus the weight of the tank itself. Most modern full-size pickup trucks have a payload capacity of 1,500 to 2,000 pounds, so a 100-gallon tank is feasible, but a mid-size truck or older vehicle may not have enough capacity.

The tank must be secured to the truck bed with heavy-duty straps, chains, or a welded frame. Straps alone are acceptable for short distances on paved roads, but if you're driving on rough terrain or at highway speeds regularly, a frame bolted to the truck bed is safer. The frame also distributes the weight more evenly and protects the tank from road debris. Frames cost $200 to $500 and are often sold separately from the tank.

Legal rules and transport restrictions

Owning a 100-gallon fuel tank is legal in all 50 states, but how you transport and store it is regulated. The Department of Transportation (DOT) requires placarding (warning labels) if you transport more than a certain threshold of hazardous materials. For gasoline, that threshold is 119 gallons; for diesel, it's higher. A single 100-gallon tank of gasoline does not require DOT placarding, but check your state's rules—some states have stricter thresholds or require placards at lower volumes.

Local fire codes often restrict where you can store a fuel tank on your property. Many jurisdictions require the tank to be at least 10 feet from a building, property line, or ignition source. Some require a secondary containment system (a drip pan or berm) to catch spills. Before you buy, contact your local fire marshal's office or building department to confirm what's allowed in your area.

If you cross state lines with a full tank, research the rules of each state you'll pass through. Some states have additional transport permits or insurance requirements for fuel carriers. Most owner-operators moving fuel for their own use (not for resale) are exempt from commercial carrier rules, but the exemption varies by state.

Cost breakdown and what's included

A basic 100-gallon steel tank with a 12-volt electric pump costs $600 to $900. Add $200 to $400 if you want a welded frame and mounting hardware. Polyethylene tanks with the same pump run $400 to $700. A 110-volt pump adds $150 to $300 to the price. Hand pumps are $50 to $150 and are often sold as add-ons.

Most tanks come with suction and discharge hoses, but hose length varies. Check that the hoses are long enough to reach from the tank to your vehicle's fuel door and from the tank to any equipment you plan to refuel. Extra hose costs $20 to $50 per 10 feet. Fuel filters (which protect your engine from sediment in bulk fuel) are optional but recommended; they cost $30 to $80 and should be replaced annually or after every 500 gallons transferred.

Maintenance and fuel quality

Fuel stored in a tank for more than a few months can degrade, especially in warm weather. Gasoline oxidizes and forms varnish, which clogs fuel injectors. Diesel can develop microbial growth (algae and bacteria) if water accumulates in the tank. To prevent this, use fuel stabilizer additives (available at any auto parts store for $10 to $20 per bottle) if you're storing fuel longer than 30 days. Keep the tank sealed and out of direct sunlight when not in use.

Check the tank's exterior monthly for leaks, cracks, or rust. Wipe down steel tanks after rain to prevent water from pooling. If you notice rust spots, sand them lightly and explore touch-up paint. Inspect hoses and connections before each use. Replace any hose that shows cracks, soft spots, or discoloration. If your electric pump stops working, test the battery voltage first (should be at least 12 volts for a 12-volt pump); if the battery is fine, the pump motor may have failed and will need replacement ($150 to $300).

Frequently Asked Questions

Can I use a 100-gallon tank to store fuel at home long-term?

Yes, but check your local fire code first. Most jurisdictions allow residential fuel storage in tanks up to 100 gallons, but the tank must be at least 10 feet from buildings and property lines, and some require a secondary containment system. Contact your local fire marshal to confirm the rules in your area before installation.

What's the difference between a transfer tank and a fuel caddy?

A fuel caddy is typically 5 to 30 gallons, portable, and designed for occasional use or small equipment. A 100-gallon transfer tank is larger, truck-mounted, and built for frequent or high-volume transfers. Caddies are cheaper but slower; transfer tanks are a better investment if you refuel regularly or move large quantities.

Do I need a special license to operate a fuel transfer tank?

No. If you're transferring fuel for your own use (not selling it), you don't need a commercial fuel handler's license in most states. However, if you're transporting fuel across state lines or storing it commercially, check with your state's fuel tax board or environmental agency for specific rules.

Can I transfer fuel between two vehicles using a 100-gallon tank?

Yes. Connect the discharge hose to the receiving vehicle's fuel door, start the pump, and transfer fuel. Make sure both vehicles are parked on level ground, engines off, and away from ignition sources. Never smoke or use open flames near the transfer area. The process typically takes 15 to 30 minutes depending on pump speed.

What happens if I overfill a polyethylene tank?

Overfilling can cause fuel to expand and overflow, especially in warm weather. It can also crack the tank if the pressure builds too much. Always leave 5 to 10 percent headspace in a plastic tank. Fill slowly and stop when fuel reaches the filler neck, not the very top of the opening.