Truck will not turn on

Ok so I turned the ignition on but engine off and I heard the fuel pump running it sound like ppsssssshhhhhhhh and then it end like 4 seconds later I checked fuel pressure and the fuel pressure is 60 psi I called chevy they said 55-65 psi is good my truck has 60 psi. Now for spark:i took the spark plug wire off I hooked a spark plug tester (it has a light in the middle)and wen I crank the truck u can barely see the spark or the light turning on its very dim so I changed the coil pack and the pcm today but still the same thing very light spark. So basiclly I dont get good spark, even tho I changed the coil pack and the pcm, I get good puel pressure and I get a good nice sound from the fuel pump. Call me if anything 860-229-4698 jorge rivera or andrew rivera if I dont pick up please leave a message thanks for the help I really appriciate it

Ok I did the same test again I have spark I have fuel and I also have the right amount of psi on the fuel.I replaced the fuel pressure regulator today too. Now she like wants to start but wont start all by the way one thing that I do notice is that there is a strong odor of gass around the engine compartment and comming out of the exhaust I also have a strong odor of gas.