Earlier carb type LT1 6 1/2-7 psi Fuel injected Vettes and Camaro aprox 45 psi.
41 to47 psi
The pressure should be 44-47 psi on LT1.
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On the fuel rail on TPI, LT1 and on the throttle body if it's TBI.
no, the 4.3 liter is a V6
I think you are hearing pressure pops. Not a backfire.
The 1993 Fleetwoods did not come with a LT1 engine. The engine is a L05, 350ci with 185 horsepower with throttle body fuel injection. The LT1 350ci with 260 horsepower was used in the 94, 95, and 96 Fleetwoods.
Try using a little starting fluid to see if it will run briefly. If it starts then dies as soon as you quit using starting fluid, the problem is related to fuel. Check the fuel pressure at the injectors. Most vehicles have a fuel pressure test port and you should be able to find out the proper fuel pressure for your vehicle/engine. If fuel pressure is low or non-existant, check the fuel filter and the fuel pump.
No
It's possible but it's ALOT of work.
I assume you mean grade of fuel by your question. You aren't supposed to run anything less than 91 octane in it.
The fuel pump pressure sensor monitors the fuel pressure of the vehicle.