2 Answers

Your fuel pump is turned on and off by the automatic shutdown relay and the pump relay. The crank sensor signal keeps it on. If the and relay does not get a signal from the computer (from the crank sensor), it turns off the pump relay (and spark). The pump should run when you first turn the key on. When you start the engine, if the computer gets no signal from the crank sensor it will shut the engine off (no fuel, no spark = off) If when you first turn the key to on, you can't hear the pump, likely either the pump has failed (check power at the pump harness) or the relay is bad.  Have it checked and replaced with a known good one if needed.

where is furl pump relay located in 1999 jeep cherokee sport