Doesn't this all depend on what the motor size and HP is? Are we talking 1000hp race car, or a 500hp street car? Service manuals have the test procedure for mechanical pumps, which I assume you are talking about. Pressure test at carb inlet, and volume test. There also is a static bench test and vacuum test.

What electronic ignition? What motor, carb. etc

Have seen Mopar electronic boxes that stop working effectively at higher rpm.

So this can be a lot of things including intake to fuel pump, filter etc...