93 chev 1500 won,t start

Just because you can hear the pump run, doesn't mean it is supplying enough fuel to properly operate the injectors. You need to check the fuel pressure at the fuel rail. If you have at least 45# of fuel pressure at the rail, you need to make sure that the injectors are metering. If memory serves me, I believe they are fired by the pickup in the distributor, but 93 is right when they were phasing into DIS ignition.

rebuild the carby as the diaphragm is not functional and pumping the fuel up

pull the carby off and have it rebuilt or re-kitted
the carby is not pulling fuel through for it to run but the primer , which is a small pump, is

Your fuel pump could be week or fuel filter needs change.

Should be in the fuel line near the intake if it is a 4 cyl.

When you state "carb" I assume you mean TB as it should be Throttle Body Injection, unless it was converted.
You should be able to hear the fuel pump in the tank prime for about 2 seconds when you first turn the key on. May have to get your helper to remove the gas cap and listen through the filler.
If you don't hear a buzzing sound then check the relays on the firewall. You can turn the key off, wait a couple seconds and then turn the key on and have your helper listen and feel for the relay that clicks.
Or look for the wires,
The relay will have a dark green/white from the ECM
Grey is power to the pump when the relay is enegized.
Orange is hot at all times. It comes from the ECM B fuse. Should check that as well if not done so.
Black/white is a ground.

Now most likely if your relay clicks when the key is turned on then its all fine and the fuel pump has gone out. The oil pressure switch also enegizes the pump when there is oil pressure.

My name is Ron ,sounds like you need to put a new pick up coil in distributor,and a module also,so you won`t have to go back in the distributor,If I can help [email protected]

you need a scan tool to check the timing. You can get close by getting the #1 piston at top dead center, and then dropping the distributor back in, making sure it lines up with the oil pump shaft. then rotate the distributor back and for untill it runs smooth. again this will only get you close. you will still want to have a mech. check with a scan tool.

38-40 is not enough fuel pressure. Replace the Fuel pump.

timing chain/belt ?