fuel pressure 1970 1.7L, loss of pressure with rebuilt pump Options

[Tking327]

Got a '70 914 1.7L 6 months ago. has spark (new plugs) and runs on starter fluid. Had been decades since it ran on gas i can tell from crumbled lines i replaced and that i had to soak cylinders in oil to unfreeze presumably rusted piston rings. Compression tested in 90 to 120 range across 4 cylinders. Replaced all fuel lines from front to back and installed a new to me (rebuilt) 3 port OEM pump and new filter. Two of the 4 injectors are new and the other two original--i cleaned those by soaking in gas. Got it to run very breifly (nice loud roar) with air filter and all vacuum lines disconnected, but shut it off as a small fire started at one old injector (I put it out immediately). replaced the bad injector and one other leaking one. Now I cant get it to run. All 4 injectors deliver gas so qualitatively the brain seems good, but volume of gas was way low like 1 mL per injector in 15 second crank. I had checked this in the fall and it seemed like better flow then. I never did any kit clean on the tank so now wondering if filter became clogged?

I checked fuel pressure. It was about 22 psi when cranking. When i stop cranking it the pressure bleeds to zero in a 5 seconds. I then spotted a very very slight leak in one of the 2 old injectors; leaking out of body of injector, not the hose attachment point. Not even enough leaking to drip just a thin film on outside of injector body. Suppose I will just replace the two remaining old injectors now. But would such a slow leak prevent me from getting the desired 30 psi to start or be the cause of such rapid pressure drop? I can spot no other fuel leaks.

When trying to start, do I need to have the air cleaner and all vacuum hoses connected or should it run at least for a little bit with everything off?

I am a newbie as you can tell, so thanks!