How do I know if the fuel pump is bad on a 1965 Mustang?
Documented on the 1965 Ford Mustang build
Published March 28, 2026
Symptoms include weak or no fuel delivery, engine sputter under load, or external fuel leakage.
Full Answer
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.
Documented In This Build
Related Knowledge
What does 'throwing curveballs' mean for the project?Do I need to rebuild the carburetor if the car runs rough?What safety steps should I take before working under the Mustang?What torque should I use on the driveshaft flange bolts?What safety steps should I take before starting?How should I protect and organize the new wiring?Can I keep the original radio and still add Bluetooth?Can I use an F100 driveshaft in my '65 Mustang?
Related Parts
Carburetor rebuild kit
$45
Mechanical fuel pump
$80
12V lead-acid battery
$120
Spark plug set (6 or 8 depending on engine)
$15
Brake line sections / fittings
$150
Wiring repair kit (connectors, heat shrink, terminals)
$25
Intake manifold gasket or small engine gasket set
$25
Sheetmetal / rust repair material
$100
Related Tools
Socket set
Floor jack and jack stands
Multimeter
Impact wrench (air or electric)
Breaker bar / torque wrench
Vacuum gauge / handheld carb tester
Grinder / cutting tools and welding gear
