All fuel pumps have spec pressure , you need that info, then get a pressure gauge and hook them into your diag connector on your car with testing tool at a repair shop or in your garage and see the pressure. If it's a older car you will need a pressure gauge and hook it up to the pump and crank over the engine, check hoses to make sure there is no any leaks, make sure there is fuel in tank if it's elec check for power & ground at pump--- check fuses also.

Another way to test the pump(lumang style)
Unhook the fuel line put that sucker in a bottle and start up see how much of a flow you have, then take it from there this is the poor mans test but it will give you an idea as to how much pump pressure you have.