I have a 1991 Jeep Wrangler Renegade. Lots of miles but mostly a stock unit and I don't think it has seen much off road. 4.0 six cylinder and automatic. Bought as my second car and toy. Heres my problem: Started the jeep in my driveway, it ran for a few seconds and shut off, kind of stumbled like it ran out of gas. Cranks over fine but won't start. I suspected fuel because of the way it stopped and because lately it seemed to crank a lot longer than usual before it would start. Gave it a shot of starting fluid and it fires right up - runs for 3 or 4 seconds and stops. I thought fuel pump because I had a chevy with a bad fuel pump act the same way. I didn't check to see if the pump was getting power or if the relay was working because I had noticed the skid plate holding the gas tank in place was really rusty and falling apart and I thought changing out the fuel pump in the tank was the motivation I needed to replace the skid plate. A lot of work if I didn't really have a bad fuel pump, but thats the way I went. New pump installed and new skid plate holding my tank up and no start. How do I test the new pump to see if I have power to it? The lid to my fuse-relay box is missing and I don't know for sure which relay or fuse is for the fuel pump.
Im a new member and fellow YJ owner as well.
I had a similar problem on my 93YJ. It would run fine and then sputter and die like it was being choked.
It took awhile and arguing with different mechanics, but it turned out to the computer ignition module. it would provide false positives, and threw all the mechanics out.
I replaced mine and then had to put it in storage for work reloc.
good luck and hope this helps