I assume you already checked some of the regular things...check for spark, make sure the timing is at least close to within specs, if these things dont work you might want to look at checking your injectors and see if they are clogged...(high mileage or sitting for a long time would be possible causes)
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the only way to tell is to have the fuel pressure tested with a gauge when its running okay then have it tested when its acting up. this will show any type of pressure and volume problem that could indicate a pump problem. when and how long has it been since you changed the fuel filter. pumps will usually act up when they get hot or when you have just filled up on gas. they will also act up when you have driven a bit and shut the engine off to go lets say into a store and come out and try to start it. this is why a fuel pressure test is important.
pumping the petal will not flood engine. Can u smell gas while trying to turn it over? can u pull a spark plug and smell fuel on it. You also do need to make sure you are getting fuel to the fuel rail first can u hear the pump come on when you turn key in the on position second with key on engine off see if fuel comes out of the port at the fuel rail careful contents under pressure.
You need to start with some basic testing before you change any parts.
First check and see if the vehicle has spark on all cylinder, second check fuel pressure on the vehicle with a fuel pressure tester. Does it pass vehicle pressure spec. If not pump or electrical wiring/ connector is faulty. Third if all of the above is good test fuel injectors for pulse with a noid light or test light. Need more info on vehicle make and model engine size and what you have tested so far with findings.
For a quick test you can spray small amount of carb clean down throttle body and see if the vehicle will start and run off from the carb clean, if it does you know you have a fuel related problem. If not you are looking down the wrong path.
before you do anything else , scan your vehicle with an OBD 2 scanning tool . If you don't get any codes: make sure your fuel pump cycles on for a few seconds when you turn the key from off to on, (you can hear it huming}...if it does then replace the in line fuel filter. if your fuel pump doesn't cycle for a few seconds when the key is turned on, check your fuel cut off (vehicle rollover )safety switch and reset it if necessary. finally , check the fuel pump relay circuit.
it is very possible and i can tell you a way to help you see if that is the issue. after your car has sit a while (as long as it usually takes before it acts up) jump in the vehicle and turn the key to the postion just before the vehicle begins to turn over when all the dash lights come on. when the key is put in this position the fuel pump runs for a few seconds and then stops until vehicle is cranked, allow the pump to run for 5 seconds then turn the key back off. then return the key to the "run" postion i mentioned before and wait a few seconds then try to start it. if it fires right up you have allowed the vehicle to build fuel pressure before you started it, indicating you have a fuel pressure issue and you are most likely looking at a weak fuel pump.