new fuel pump and filter still only 20 psi please help

It sounds like you have either a restriced fuel line or possibly have gotten a bad fuel pump. Make sure you use and original equipment pump (DELCO)

i had the same problem with my truck (1996 chevy 1500 4.3 liter) i changed my fuel pump and strainer and it still would not start after checking wiring, changing distributor cap and button and ignition switch. i checked fuel pump pressure output specs. in my chilten manual and found my truck should have 50 to 60 psi fuel pressure. to make a long story short the auto part store sold me the wrong fuel pump in 1996 4.3 started with the muti port fuel injection. 95 and before had throttle body injection that required 13 psi i took my box back to the auto part store and had a different person look up the part number and compared it to the number on my box there was one digit difference. if you still have your box give it a try. the pumps look identical. i guess i should have looked at the date on this question. i hope you have it running now. maybe this will help someone else