Sounds like the manual fuel pump to
Me... Can confirm w pics.... To replace you have several options....
You can easily replace the mechanical
Pump with another, or you can replace it with a electric pump.... Both will
Have their pros and cons....
To replace the mechanical carefully unbolt your fuel lines from the pump.... Take note of which line come from which port.... You'll see one line that runs along your frame, and one that goes up to your carburetor....
Next unbolt the 2 bolts holding the pump on the motor.... It will then slide out of the motor, replace the small
Paper gasket, also apply a small amount of high temp silicone to the gasket.... A very light film is all you need to insure no oil leaks.... Slide new pump slide into motor, you should feel some tension as it rests on the cam/fuel
Pump lobe....
Bolt the fuel pump snug to the motor, and attach fuel lines.... A few cranks of the key and you should be good to go
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1966,351,m5od,205....3.5" lift, 2" body, 35's,