If you're running EFI (or planning to), you need an EFI-compatible fuel tank. Your factory tank doesn't have a return line or mounting point for a high-pressure pump. Tanks Inc builds bolt-in replacements with everything included.
These tanks are made in the USA using 18-gauge steel (not thin Chinese junk). They're exact reproductions of the factory tank but with modern features: internal baffles, EFI pump module, return line, and a proper vent system.
The tank, fuel sending unit, fuel pump module (with high-pressure pump), all fittings, and a wiring harness for the pump. You supply the fuel lines.
EFI fuel tank kit: [Tanks Inc 1964-72 Chevelle EFI Tank (TM34B-EFI)](https://www.amazon.com/dp/B01M5KF1DT?tag=rusttoroad-20)
Jack up the rear, support with jack stands. Disconnect the fuel line at the tank. Disconnect the fuel gauge wire. Unbolt the two straps holding the tank. Lower the tank carefully—it's probably full of sludge.
The factory tank has been sitting there for 50 years. The straps are rusty. The mounting surface is rusty. Wire brush everything. Paint the straps and frame with POR-15 or similar rust converter.
Rust treatment: [POR-15 Rust Preventive Paint (Quart)](https://www.amazon.com/dp/B0002Z2B0Q?tag=rusttoroad-20)
The Tanks Inc pump module drops into the top of the tank. It includes a 255 LPH high-pressure pump (enough for 500+ HP), fuel filter, and return line fittings. Tighten the locking ring using a brass punch and hammer.
Included in tank kit.
Lift the tank into place. Bolt the straps on using the factory mounting points. Torque the strap bolts to 15 ft-lbs—don't overtighten or you'll dent the tank.
You need three lines: feed, return, and vent.
- Feed line: 3/8" from the pump module to the engine - Return line: 5/16" from the engine back to the tank - Vent line: 1/4" from the tank to a vent above the rear axle
Pre-bent fuel line kit: [Classic Performance Products EFI Fuel Line Kit (CPP-FUEL-EFI)](https://www.amazon.com/dp/B01N7ZJVQG?tag=rusttoroad-20)
The pump module has two wires: 12V power and ground. Run the power wire to a relay (included in the kit). The relay triggers when you turn the key to ON. Ground the black wire to the frame.
Relay included in kit.
The sending unit screws into the top of the tank. It's calibrated for the tank's depth—don't use your old sending unit or your fuel gauge will read wrong.
Fill the tank with 5 gallons of gas. Turn the key to ON (don't start the engine). The pump should prime for 3 seconds. Check all fittings for leaks. If dry, you're good to go.
- Tanks Inc EFI tank kit: ~$650 - Fuel line kit: ~$180 - POR-15 rust treatment: ~$40 - Wiring supplies: ~$20
Total: $890 in parts. The foundation for a reliable EFI system.
Pump won't prime: Check voltage at the pump connector. Should have 12V key-on. If no voltage, check the relay and fuse.
Fuel gauge reads empty: The sending unit might be installed backwards. The float arm should point toward the rear of the tank.
Fuel smell in the cabin: Check the vent line. It must terminate outside the car, above the rear axle. If it vents inside the trunk, you'll smell gas.
This is one of those upgrades you do once and forget about. No more rust flakes in the fuel filter. No more vapor lock. No more wondering if your 50-year-old tank is going to leak in your garage. Tanks Inc builds them right.
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