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you take the fuel line off and have someone turn the car over. if no fuel comes out it is bad. it will pump fuel just turning over.

MazdaTech_PR
first thing is fuel injection or carburetor? assuming is FI you have to cut the outlet fuel hose and place a fuel pressure gauge there if it is higher than 20psi then is bad your regulator but.... it can be different psi depend on the engine and brand of the car buy the repair manual of your car it should say what is the correct psi at the inlet and the outside fuel line is very weird in FI system get a broken fuel regulator (unless you have work on it) they are mechanical and cant be adjusted so... they will work ever at the same pressure if your car dont start is still an electrical issue

grandnational_man
Depending on the car you should cycle the key on and then pull the vacuum line off the regulator, if you have any fuel there then the diaphragm is punctured and you need to replace the regulator. If you don't have any fuel there then it is good and you should replace the fuel filter. If when this is done and it still won't run properly then you must have a bad fuel pump.