65 Mustang fuel tank replacement
This video demonstrates replacing the fuel tank on a 1965 Ford Mustang, covering draining and disconnecting the fuel, dropping the old tank, and installing a new tank with all connections reattached. The walk-through includes disconnecting fuel lines and the filler neck, supporting and lowering the tank, transferring or replacing the sending unit, and reconnecting and testing the system.
Build Sequence
1. Safety prep and battery disconnect
Park on level ground, set parking brake, chock wheels, and disconnect the negative battery terminal to eliminate ignition or sparks while working with fuel.
2. Drain or siphon fuel from tank
Use a fuel-safe container and siphon pump to remove as much gasoline as possible from the tank to make it lighter and reduce spillage when lowering.
3. Raise car and support safely
Lift the rear of the Mustang with a floor jack and place jack stands under correct lift points to safely support the vehicle while you work underneath.
4. Disconnect fuel lines and filler neck
Use line wrenches and screwdrivers to disconnect the fuel lines from the tank and remove the filler neck connection; catch any remaining fuel in a drain pan.
5. Support and unbolt fuel tank straps
Support the tank with a jack, then remove the bolts or nuts holding the tank straps. Have an assistant or backup support to prevent the tank from dropping suddenly.
6. Lower and remove the old tank
Carefully lower the tank with the jack and remove it from under the vehicle. Move it to a well-ventilated area for further work (sending unit removal, cleaning, disposal).
7. Transfer or replace sending unit and fittings
If reusing the sending unit, remove it from the old tank and install it into the new tank with a new gasket/seal. Replace any corroded fittings or line connections.
8. Test-fit new tank and re-install straps
Position the new tank under the car, raise it into place with the jack, and align it with mounting points. Reinstall the straps and torque hardware to spec.
9. Reconnect fuel lines, filler neck and filter
Reconnect the fuel lines, install a new inline filter if desired, attach the filler neck and clamps, and ensure all connections are secure and leak-free.
10. Refill, bleed if necessary, and leak check
Refill the tank with a small amount of fuel, reconnect the battery, turn the ignition to prime the pump and check for leaks. Top off fuel and perform a road test to verify proper operation.
Frequently Asked Questions
How should I dispose of the old fuel and tank?
Drain fuel into an approved fuel-safe container and use a hazardous waste disposal facility or recycling center for disposal. For the tank, check local scrap and hazardous-material rules—many shops will recycle metal tanks if emptied and cleaned.
VIEW FULL ARTICLE →How long does a fuel tank replacement on a '65 Mustang typically take?
Expect roughly 3–5 hours for a DIYer, depending on experience, ease of access, whether you need to transfer the sending unit, and whether any rusted hardware slows you down.
VIEW FULL ARTICLE →What safety precautions are important when working with the fuel tank?
Work in a well-ventilated area, eliminate open flames or sparks, disconnect the battery, catch and properly store drained fuel, and use proper supports (jack stands) when working under the car.
VIEW FULL ARTICLE →Can I reuse the old fuel sending unit?
Yes, if the sending unit is functional and not corroded you can transfer it to the new tank, but installing a new sending unit or at least a new seal is recommended to avoid leaks and gauge issues.
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Parts Used (7)
Full replacement tank for 1965 Mustang; may be an OEM or reproduction tank.
Fresh lengths of steel or rubber fuel line to replace old or corroded sections.
Often removed from old tank and installed in new tank; replace if faulty or corroded.