
The 1965 Ford Mustang is a classic car, but its fuel tank capacity has always been on the lower side. The standard fuel tank for this model is 16 gallons, which doesn't get you very far in terms of range. Enthusiasts have often opted for a 22-gallon tank as a drop-in replacement, but this requires modifications to the fuel filler neck. Various fuel tank kits are available for the 1965 Mustang, offering standard or upgraded fuel capacity, and some include additional features such as drain plugs and mounting hardware.
| Characteristics | Values |
|---|---|
| Fuel Tank Capacity | 16 gallons |
| Fuel Tank Kit | With Drain Plug |
| Fuel Tank Kit Components | Fuel Tank with Drain, Fuel Sending Unit with Gasket, Locking Ring, Filler Pipe Hose, Filler Pipe Gasket, Fuel Tank Mounting Hardware, Fuel Tank Filler Screws |
| Fuel Tank Dimensions | 32-5/8" x 24 1/2" x 7" |
| Fuel Tank Replacement Options | 22-gallon fuel tank, GEN II Stealth Tanks (16 gallons), Sniper Fuel Tanks (16 gallons) |
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What You'll Learn

The 1965 Mustang's fuel tank capacity is 16 gallons
The 1965 Ford Mustang is a classic car, but its fuel tank capacity is only 16 gallons. This limited the range of the car, with a full tank of fuel only providing around 250 miles of travel, or about four hours of driving, before needing to refill.
The 16-gallon fuel tank was standard for the Mustang from 1965 to 1968. Owners of these classic cars often opt to replace the original tank with a 22-gallon version, which was introduced in 1970. The larger tank is a drop-in replacement, but it does require some adjustments to fit properly, such as cutting or bending the fuel filler neck.
There are also safety considerations when replacing the fuel tank. One option is to bolt the fuel tank in using Grade 8 bolts, washers, and locknuts around the perimeter of the tank. This adds security in the event of a rear-end collision. Another option is to install a steel barrier, such as the Rear Seat Metal Trunk Divider, which isolates the fuel tank from the trunk contents.
The 16-gallon fuel tank for the 1965 Mustang is available as a kit with a drain plug, sending unit, mounting hardware, filler hose, and other necessary components. This kit is designed to bolt up to the factory locations using original hardware, or with the included mounting hardware kit if needed. It is important to follow safety procedures when installing a new fuel tank, such as draining the fuel into a suitable receptacle in a well-ventilated area.
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Fuel tank kits for the 1965 Mustang
The 1965 Mustang has a 16-gallon fuel tank. There are a number of fuel tank kits available for the 1965 Mustang.
Evan-Fischer Fuel Tank
This 16-gallon fuel tank is compatible with the Ford Mustang models from 1965 to 1968. It is an affordable replacement product for restoration needs. The product is manufactured according to industry standards to ensure durability and reliability. All Evan-Fischer products come with a 1-year unlimited mileage warranty.
Fuel Tank With Drain Plug Kit
This kit includes everything needed to bolt up to the factory locations using original hardware. The fuel tank mounting hardware kit comes with all the necessary mounting hardware required to secure a new fuel tank. The tank is coated to prevent rust and corrosion. The kit includes:
- Fuel tank with drain
- Fuel sending unit with gasket
- Locking ring
- Filler pipe hose
- Filler pipe gasket
- Fuel tank mounting hardware
- Fuel tank filler screws
GEN II Stealth Tanks
These 16-gallon fuel tanks are made of steel and painted silver. They are available with either a 340 lph pump or a 200 lph pump.
Sniper Fuel Tanks
These 16-gallon fuel tanks are made of steel and painted silver. They come with a fuel pump and a lock ring.
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Fuel mileage of the 1965 Mustang
The fuel mileage of a car depends on several factors, including engine size, driving style, and road conditions. While I couldn't find specific fuel mileage figures for the 1965 Mustang, I can provide some information on fuel tank capacity and general fuel economy for classic Mustangs.
The fuel tank capacity of the 1965 Ford Mustang is 16 gallons. This information is based on replacement fuel tanks available for the 1965 model and its compatibility with other Mustang models from 1964 to 1968.
When it comes to fuel economy, different engines and configurations can result in varying mileage. For example, one source mentions that a 1966 Mustang with a straight-six engine didn't provide significantly better mileage than an 8-cylinder model, but offered less power.
Another factor to consider is the real-world experience of owners. One website provides mileage estimates for the 1965 Mustang based on data from 60 owners, covering a collective distance of 169,000 miles. However, the specific details and figures from this source are not available.
It's important to note that fuel economy standards and expectations have evolved significantly since the 1960s. Classic cars like the 1965 Mustang may not offer the same fuel efficiency as modern vehicles, and their engines may have different performance characteristics.
If you're considering a 1965 Mustang or a similar classic car, it's advisable to research the specific engine configuration and seek out owner communities to gain a more accurate understanding of the fuel mileage you can expect.
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Fuel tank replacement options for the 1965 Mustang
The 16-gallon fuel tank of the 1965 Mustang is a common replacement item, given its age. There are a variety of options available for replacement, depending on your preferences and budget.
Evan Fischer 16-Gallon Fuel Tank
This is a direct-fit, OE replacement fuel tank, which can be used for fuel or as a fuel transfer tank. It is a good option for restoration projects, as it is affordable and manufactured to industry standards, ensuring durability and reliability. It is compatible with the 1965 Mustang, as well as later models up to 1968. It comes with a 1-year unlimited mileage warranty.
GEN II Stealth Tanks 16-Gallon Fuel Tank
This is another 16-gallon option, which is made of steel and painted silver. It is available with either a 200 or 340 lph pump.
Sniper 16-Gallon Fuel Tank
This fuel tank is made of steel and is galvanized. It comes with a lock ring included.
22-Gallon Fuel Tank
A larger fuel tank, such as the 22-gallon tank from the 1970 Mustang, can also be installed in the 1965 Mustang. This option will cause the tank to sit higher in the trunk, and may require some modifications for installation, such as drilling additional holes and using bolts instead of screws.
When replacing the fuel tank, it is important to also consider the fuel lines and the sending unit, to ensure compatibility and correct gauge readings.
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Safety precautions for the 1965 Mustang's fuel tank
The 1965 Mustang is a sought-after classic car, with its powerful yet lightweight design. However, as with any older vehicle, safety is a concern, especially when it comes to the fuel tank. Here are some safety precautions to consider for the 1965 Mustang's fuel tank:
Fuel Tank Maintenance
The fuel tank in the Mustang has a capacity of 16 gallons. Over time, these tanks can rust, leading to fuel leaks. Regularly inspect the fuel tank for any signs of rust or deterioration, and replace the tank if necessary.
Fuel Filler Necks and Caps
The fuel filler neck plays a crucial role in keeping gasoline odors out of the cabin. Ensure that the filler neck is in good condition and replace it with a heavy-duty sheet metal one if needed. Additionally, check the fuel cap for any signs of deterioration. Keep the cap in good condition to prevent dirt, pollen, and rain from entering the fuel connections.
Fuel System Integrity
Ensure that the fuel system is well-maintained. Leaky carburetors and ignition wires can be a fire hazard. Regularly inspect and replace these components as needed to prevent fuel leaks and potential ignition sources.
Collision Protection
The placement of the fuel tank in the Mustang has raised concerns about its vulnerability in rear-end collisions. While some owners have installed stronger bolts to hold the tank in place, others have opted for a bladder-style tank or a drop-in replacement with a fuel cell. Consider adding additional protection, such as a steel plate or a custom tank cover, to enhance safety in the event of a collision.
Safe Driving Practices
While the Mustang's fuel tank design may be a concern, it's important to maintain safe driving practices. Always wear a seatbelt, and consider installing a harness for added safety. Regularly inspect your vehicle for any fuel leaks and address them promptly. Stay vigilant and proactive in maintaining your Mustang to minimize the risk of fuel-related incidents.
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Frequently asked questions
The standard fuel tank for a 1965 Mustang is 16 gallons.
The tank measures 32-5/8" x 24 1/2" x 7".
Yes, California Mustang offers a 22-gallon fuel tank designed to fit 1965-68 Mustangs.
You can install a new fuel tank by draining the fuel, removing the old tank, and bolting in the new tank using Grade 8 bolts, washers, and locknuts.











































