So you’ve decided to add a transfer fuel tank to your pickup. Good call.
Whether you’re running heavy equipment on a job site, managing farm operations miles from the nearest gas station, or just tired of making fuel runs every other day, a transfer tank can save you serious time and hassle.
But here’s the thing—installation isn’t exactly plug-and-play.
You’re dealing with fuel. That means thinking about safety, regulations, proper mounting, and making sure everything actually works before you start pumping diesel or gas into equipment.
I’ve walked through this process more times than I can count, and honestly? Most people overthink it.
The actual install isn’t rocket science. It’s more about being methodical and not skipping steps that matter.
Let me walk you through exactly how to get this done right.
10 Steps How To Install A Transfer Fuel Tank On A Pickup Truck
Before you even pick up a wrench, understand what you’re getting into. This isn’t a 30-minute job.
Depending on your setup and how comfortable you are working with fuel systems and basic wiring, plan for anywhere from 2 to 5 hours.
Maybe more if you’re being extra careful or running into clearance issues.
You’ll be securing a tank that weighs 40 to 100+ pounds empty, routing fuel lines, making electrical connections if you’re running an electric pump, and testing everything for leaks. None of it’s complicated. But it does require attention.
Choose the Right Transfer Fuel Tank
This is where most people mess up. They buy a tank based on capacity alone and then realize it doesn’t fit their truck bed.
First, measure your bed. I mean actually measure it—don’t guess. You need:
- Length from the front of the bed to the wheel wells
- Width between the bed rails
- Height clearance if you’ve got a tonneau cover or bed cap
Most tanks are sold by gallon capacity, not dimensions.
A 50-gallon tank from one manufacturer might have completely different dimensions than another 50-gallon model. Check the spec sheets or call the supplier.
If you’ve got a short bed, you’re probably looking at 50 gallons max unless you go with something like an L-shaped or wedge design.
Long beds can usually handle 75 to 100 gallons, sometimes more.
Got a gooseneck hitch or fifth wheel setup? That changes everything. You need to leave clearance for the hitch ball and coupling. I’ve seen people buy a beautiful 100-gallon tank only to realize it blocks their gooseneck completely.
Material matters too. Steel tanks are durable and cheaper, but they can rust if the powder coat gets scratched.
Aluminum costs more but won’t rust, which is huge if you’re in a wet climate or anywhere they salt the roads. White steel tanks stay cooler in the sun. Black looks good but gets hot.
Gather Tools and Materials
Transfer fuel tanks similar to https://www.vevor.com/transfer-tanks-c_42173 typically come with basic hardware, but a few additional items are still necessary for a clean, safe installation.
Here’s what you’ll need:
Tools:
- Socket set (standard and metric)
- Wrenches
- Drill and drill bits
- Screwdriver set
- Wire strippers and crimpers (for electric pumps)
- Measuring tape
- Level
- Marker or chalk
- Safety glasses
Materials:
- The transfer tank itself
- Mounting brackets (usually included, but double-check)
- Bolts, nuts, washers (sometimes you need extras)
- Fuel-rated hose and clamps
- Teflon tape or pipe sealant rated for fuel
- Electrical wire (12-gauge minimum for most pumps)
- Wire connectors and heat shrink tubing
- Inline fuse holder and appropriate fuse
- Battery terminal connectors or switch (depending on your wiring preference)
Some tanks come with pumps included. Others don’t. If you’re buying separately, make sure the pump matches what you’re planning to transfer—gasoline, diesel, or kerosene.
Flow rate matters too. An 8 GPM pump is fine for small equipment and vehicles. If you’re filling larger tanks or bigger machines, go with 15 or 20 GPM.
Prepare the Pickup Truck Bed
Empty your bed completely. I know it sounds obvious, but you’d be surprised.
If you’ve got a bed liner, you might need to work around it or even drill through it for mounting bolts. Spray-in liners are usually fine to drill through.
Drop-in liners… well, you might want to pull it out temporarily.
Clean the bed surface where the tank will sit.
Dirt and debris can cause the tank to sit uneven, which can stress mounting points or cause issues with fuel distribution.
Check for rust or damage on the bed floor. If there’s significant rust, fix it now.
You don’t want a mounting bolt pulling through corroded metal later.
If you’re running a gooseneck or fifth wheel, mark where those components are so you can visualize clearance when positioning the tank.
Position the Transfer Fuel Tank
This step is more important than it seems.
Set the tank in the bed without bolting it down yet. Move it around. See how it sits.
Most people put transfer tanks up against the front of the bed, right behind the cab.
This keeps weight over the axle and leaves the rear of the bed open. But that’s not the only option. If you need access to a gooseneck, you might position it differently.
Use your measuring tape and level. Make sure the tank sits level side-to-side.
Front-to-back can have a slight angle depending on your bed, but side-to-side needs to be pretty close to level or you’ll have issues with fuel pickup and venting.
Mark the mounting holes with a marker or chalk. Double-check these marks. Measure twice, drill once.
Secure the Tank in Place
Now you’re committing.
Drill your mounting holes. Take your time. Use the right size bit for your bolts.
If you’re going through a bed liner, go slow to avoid cracking it.
Some setups bolt directly through the bed floor. Others use mounting rails or brackets that attach to the bed rails or stake pockets. Follow whatever system your tank uses.
Don’t overtighten the bolts. Seriously.
You want it snug, but if you crank down too hard on a poly tank, you can crack it. Steel tanks are more forgiving, but still—snug, not gorilla-tight.
If your tank has rubber isolators or spacers, use them. They reduce vibration and noise.
Once it’s bolted down, try to move it. It should barely budge. If it’s shifting or rocking, something’s not right.
Install the Fuel Transfer Pump
If your tank came with a pump pre-mounted, you’re ahead of the game. If not, you’ll need to install it.
Most pumps mount directly to the top of the tank, usually in a recessed area or on a flat mounting surface.
There should be an opening or bung hole where the pump pickup tube goes into the tank.
Thread the pickup tube into the tank opening. Use Teflon tape or a fuel-safe sealant on the threads. Hand-tighten first, then snug it up with a wrench. Don’t strip it.
Attach the pump to its mounting bracket. Make sure it’s secure.
A loose pump will vibrate like crazy when it’s running.
Check that the pickup tube reaches close to the bottom of the tank but doesn’t touch. You want it low enough to pull fuel efficiently but not so low that it picks up sediment.
Connect Fuel Lines and Fittings
This is where leaks happen if you’re not careful.
Attach the fuel hose to the pump outlet. Most pumps come with a hose, but if you’re replacing it or extending it, make sure it’s fuel-rated.
Regular garden hose or cheap vinyl tubing will degrade and crack.
Use proper hose clamps. Tighten them down. Check them.
If your pump has a filter, install it now. Filters go between the pump and the nozzle, not before the pump. Position it where you can access it later for changes.
Attach the nozzle to the end of the hose.
If you’re using a manual nozzle, just thread it on and tighten. If you’ve got an auto-shutoff nozzle, make sure it’s oriented correctly so it can sense back-pressure.
Some people add a swivel fitting near the nozzle.
Makes handling the hose way easier. Not required, but nice to have.
Route your hose so it’s not going to get pinched or kinked. If it’s dragging on the ground, consider a hose hanger or reel.
Wire the Pump (For Electric Systems)
Manual pumps don’t need wiring. Electric pumps do.
You’re running 12-volt DC power from your truck battery to the pump. This isn’t complicated, but it does need to be done safely.
Run 12-gauge wire (or whatever your pump manufacturer recommends) from the battery to the pump. You’ll need a positive and a ground.
Install an inline fuse near the battery—this is non-negotiable.
The fuse protects your truck’s electrical system if something shorts out. Use the fuse rating recommended by the pump manufacturer, usually 15 to 30 amps.
Many people wire in a switch so they can turn the pump on and off from the cab or the bed. Mount the switch somewhere accessible but protected from weather.
Connect the positive wire to the positive terminal on the pump.
Connect the ground wire to a clean ground point on the truck frame or directly to the battery’s negative terminal.
Use proper connectors. Crimp them tight. Cover them with heat shrink tubing to protect from moisture.
Before you button everything up, test it.
Turn the switch on (with the nozzle open and pointed into a bucket or back into the tank). The pump should run smoothly without weird noises or vibrations.
Test the System for Leaks and Functionality
Do not skip this.
Fill the tank with a small amount of fuel—5 or 10 gallons is enough for testing. You don’t need to fill it all the way.
Turn on the pump and let it run. Watch every connection. Look for drips, seepage, or wet spots.
Check:
- Tank fittings where the pump attaches
- Hose connections at both ends
- Filter housing if you installed one
- Nozzle connection
Run fuel through the system a few times. Pump it into a container, then pour it back into the tank. Repeat.
If you find a leak, shut everything down. Tighten the connection or replace the fitting. Test again.
Also check that the pump is pulling fuel efficiently.
If it’s struggling or cavitating (making a sucking, sputtering sound), the pickup tube might not be positioned right.
Final Inspection and Safety Check
You’re almost done. But take a few minutes for a final walk-around.
Check all bolts and mounting hardware. Everything still tight?
Look at your wiring. Is it secured away from sharp edges and moving parts? Is the inline fuse in place?
Make sure the rollover vent (if your tank has one) is clear and pointing in a safe direction—usually down and away from the truck.
Confirm that your pump switch is off when not in use.
Leaving it on can drain your battery or cause the pump to run accidentally.
Think about where you’re storing the nozzle when it’s not in use.
Some people use a holster or hook. Others just coil the hose. Whatever you do, make sure fuel isn’t dripping onto the bed or the ground.
One more thing—remember you can’t fill the tank 100% full.
Leave about 10% empty to allow for fuel expansion and proper venting. A 50-gallon tank should only get about 45 gallons. If you overfill it, fuel will leak out the vent, and you’ll have a mess.
Conclusion
That’s it. If you followed these steps, you’ve got a functional transfer fuel tank installed safely and correctly.
Is it perfect? Maybe not the first time. You might find a connection that needs tightening after a week of use, or decide you want to move the pump switch to a better spot. That’s normal.
The key is you did it methodically. You didn’t rush. You checked for leaks. You thought about safety.
Now you’ve got fuel on hand when you need it, right in your truck bed.
No more mid-job fuel runs. No more wondering if the gas station on the way to the site is actually open at 5 AM.
Just remember to check your local regulations about carrying fuel in a vehicle.
Some states have limits, especially for commercial use. It’s worth a quick call to your DOT or a local official to make sure you’re legal.
And if something doesn’t seem right during your install—a fitting that won’t seal, a pump that won’t prime, whatever—don’t force it. Stop and figure it out.
Fuel systems aren’t something to guess about.
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