91 RS 305 Cranks But Won't Start
 

I have a 91 RS 305 TBI with only 28,000 miles on it. Car was sitting for about 5 months and started occasionally, but not driven due to weather. I went to start her the other day to actually go for a drive, but now she won't start! I can hear the fuel pump when I turn the key to the on position. I can also hear the relay clicking, but the injectors aren't spraying any fuel. Compression is good, and it is getting spark. It will start with starting fluid or fuel poured directly into TB. Just to be sure it was getting fuel I pulled off the fuel line to the injectors and turned the key. Fuel did come out until pump shut off. Then I tested the injectors with a noid light, and they were pulsing. Security light is not on, and I don't have a check engine light. Also just to be sure, I jumped the A and B connectors on the ALDL and only got the number 12 Checking system code. I am getting very frustrated. I just want to go for a drive! Please help.

Code 12 is okay.
Engine runs pouring in fuel - injectors plugged even though they are commanded on/off.
Try start again, then renove a spark plug and check for wetness.
If wet, dry plugs.
If dry, check/remove/Reinstall coolant sensor connector, the two-wire connector as it may be corroded.
Externally charge battery while waiting. You might ecven get a Schmacher Battery Maintainer from Walmart, $10, and keep on battery while at rest.
Also, pour in Sta-Bil fuel stabilizer at every tank. Doesn't hurt and follow directions on bottle. If too much put in, no problem.

Was fuel just "coming" out, or spraying with force? If only running out, the fuel pump is bad, or fuel filter is clogged, or the rubber pump to sending unit connector inside the tank is split/deteriorated. The latter is what my old 91 had

Fuel pressure test, If you have pressure and signal to the injectors then its an injector issue. I am betting you have little to no pressure. Hopefully it is the split line like Camaro 69 said. If its a plugged filter you might as well replace the pump now.

These pumps need a constant flow of fuel to keep them cool, if you block that flow for even a few minutes then tend to over heat. They might not die instantly but they will soon. These are lower PSI pumps and may not be as sensitive. The bad part is once it goes the car becomes a paper weight.