97 gmc Pick up won't start

Got an old beat up Pick up 350 engine I think. Started it the other morning warmed it up for 10-15 minutes. got in and drove 1/4 mile and it stalled, like no gas. I knew I was low but should have gone 20+ miles. Ran home got gas can added 2 gallons. Cranks fine but won't start. I can hear fuel pump running. I checked little schrader like valve in gas line and have fuel. I sprayed in starter fliud and got 2 pops but no running. maybe compression ignited it. I poured in 1 oz gasoline and got same thing 2 or 3 pops when cranking but no start. Seems like no fire. What could this be? any DIY test to verify?

Start by checking fuel pressure you need 65 psi.

I have a 2000 GMC Sonoma 4.3L V6. The engine will not start without starting fluid. I hooked up a fuel pressure regulator and it only reads 40lbs. of pressure. The manual says it should be 53-60lbs. When i get it started with starting fluid, while driving, it bogs down if i floor it or press the gas pedal down too quickly. Is my problem the fuel pump? Thank you for your help.