Three tests to be made on an engine-driven fuel pump:
1. Pressure
2. Volume
1 and 2 are done on the fuel pump outlet fitting, or at the carb, or somewhere in between. Fuel pump discharge side.
3. Vacuum. The test everyone forgets about. Fill float bowl, disconnect fuel pump inlet hose. Connect vacuum gauge to inlet of pump. Start engine--engine runs on fuel in float bowl. Vacuum better be significant, and it should hold vacuum for a minute or ten when the engine stalls from lack of fuel.
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