This 65 Mustang Keeps Throwing Curveballs
This video follows a 1965 Ford Mustang project that keeps presenting unexpected problems during repairs and troubleshooting. The build covers diagnosing engine and fuel-related issues, addressing electrical gremlins, and handling several minor body and brake repairs encountered along the way.
Build Sequence
1. Initial inspection and diagnosis
Perform a walk-around and basic systems check (battery voltage, fuel level, visible leaks, obvious wiring damage). Look for signs of rust, loose hoses, cracked wiring, fluid leaks, and any broken mounts or brackets.
2. Address battery and charging
Test battery and charging system with a multimeter. Replace or charge the battery if voltage is low and ensure alternator output is within spec to rule out electrical low-voltage issues affecting starting and accessories.
3. Fuel system troubleshooting
Check mechanical fuel pump operation, fuel lines and filter. If the engine is starved or leaking, replace the fuel pump and clean or rebuild the carburetor as needed.
4. Carburetor rebuild and tuning
Remove the carburetor, disassemble and install a rebuild kit (jets, gaskets, needles). Reinstall and set float level, idle mixture and timing to get a stable idle and throttle response.
5. Electrical repairs and wiring cleanup
Repair corroded connectors, replace brittle wires, and secure grounds. Use solder or quality crimp connectors with heat shrink. Re-test all electrical circuits that were giving intermittent issues.
6. Brakes and safety items
Inspect brake lines, hoses and wheel cylinders/calipers. Replace corroded lines or leaking fittings, bleed the system, and ensure safe operation before moving the car under its own power.
7. Small body and rust repairs
Cut out small rusted sections, fabricate patch panels or use pre-made patches, weld and seal seams, then prime to prevent further corrosion.
8. Final checks and road test
Perform a final systems check (fluids, belts, hoses, lights), then carefully road test to confirm issues are resolved and that no new problems present themselves.
Frequently Asked Questions
What does 'throwing curveballs' mean for the project?
It means the car presented multiple unexpected problems as work progressed — things like hidden rust, electrical gremlins, fuel delivery issues, or seized hardware that weren't obvious at first glance.
VIEW FULL ARTICLE →Do I need to rebuild the carburetor if the car runs rough?
Not always, but a carburetor rebuild is a common and relatively inexpensive first step when a vintage car runs poorly. Check for vacuum leaks, fuel delivery, and ignition issues first; if those are okay, a rebuild is likely beneficial.
VIEW FULL ARTICLE →How do I know if the fuel pump is bad on a 1965 Mustang?
Symptoms include weak or no fuel delivery, engine sputter under load, or external fuel leakage. You can test by checking fuel pressure/flow at the carburetor or listening for pump operation when cranking.
VIEW FULL ARTICLE →What safety steps should I take before working under the Mustang?
Use a properly rated floor jack and jack stands on solid ground, chock wheels, disconnect the battery when doing electrical work, and wear eye protection and gloves when cutting or welding.
VIEW FULL ARTICLE →
Parts Used (8)
Used to refresh carburetor jets, gaskets and needles if the carb is causing poor running or fuel leaks.
Fresh battery to eliminate electrical/no-start issues caused by low voltage.
Replace old fouled plugs to assist in proper engine tune and starting.
Replace corroded lines or fittings discovered while inspecting the braking system.
Used to repair aging/fragile wiring and intermittent electrical faults.
For fixing vacuum leaks or oil/coolant leaks at mating surfaces found during troubleshooting.
Material for patching small rusted sections discovered while working on the car.