Engine will not fire up and run?

98 Jeep Wrangler, odo 79,000
Manual, 4.0
I drained the fuel tank out of fear someone had put something in the tank because we saw someone in the middle of the night out by it. This is a new car for us so I immediately drained the tank just in case. Jeep ran perfect before this. I jumped relay with a wire to drain the tank. Luckily nothing was in the fuel. I reconnected the relay put a quarter of a tank of new fuel in just in case & now it will not start & service engine light is on. I have tried another relay per a mech at the dodge dealership to check to see if the fuel would pump it does not. If I reconnect just the jumper wire it pumps fuel. But with relay in it does not. Please help.

I have an 89 Jeep Wrangler, 2.5L 4cyl with 205,000 miles. It is in great shape! However, it sat in storage for 1 year unused. I had to jump start it to get it started so I could remove it from storage. It started fine and ran for about 10 minutes and died. I have not been able to start it since. The engine rotates normally, but will not start. I replaced the battery, oil/filter, spark plugs/wires, distributor cap/rotor, drained as much of the old fuel as possible and replaced it with new. None of that seemed to change the symptoms. I used starting fluid to try to get it to start and it did not work either. The engine just keeps rotating, but it never starts! Please help!

I had a similar issue with my 1996 cherokee last year. The vehicle ran great for months and then just wouldn't start one day.

I had to replace the BRAIN $$$ (computer) and have had no problems with starting the vehicle since. Hope this helps.

Minnesota