92 wrangler wont start

no inertia switch or power switch --fuses and relays only

That could be caused by a few different thing's . One would be a fuel pump static pressure check valve ,located in the fuel pump module . The way to test this is to hook - up a fuel pressure gauge , turn the key on an off several times , to build fuel pressure . Then let it sit to see if the fuel pressure drops . If it drops you need a new fuel pump module . Did your mechanic use an after market or factory fuel pump ? Another cause could be an engine sensor going bad . Have to have a scan tool hooked up to check sensor data .

Probably out of fuel

If it cranks at normal speed, it could be the fuel pump or loss of spark. Autozone has a loan-a-tool policy. Pretty sure you can borrow or rent a fuel pressure gauge to see how good your pump and fuel filter is. Just hook it up to the test port on the engine's fuel rail, and turn the key to on, not start. It should immediately show about 40 pounds of pressure- 40 psi. If it is good, then it is probably an ignition problem, and you need to check for spark on a spark plug wire.

If the test shows no pressure, then the pump may be bad. It is not turning on, for sure. A final check before replacing the pump is to check that the pump power wire at the fuel tank connector has power on it with the engine cranking over. If it has power there when cranking, the pump circuit is good (all fuses and relays good). The fuel pump itself is the problem.

On that model jeep, if it is a Cherokee Sport like my son's '95 jeep, it is quite easy to change out a fuel pump. You don't have to drop the gas tank to replace the pump. The assembly goes into the gas tank at the front upper part of the tank, above and just back of the rear differential. I changed out the fuel pump on his jeep in a K-mart parking lot in a little under 2 hours. Wiggling and twisting the assembly out of the gas tank hole for removal was the most time consuming part. It was really quite easy. If you have ever replaced a pump before, .the jeep is a breeze.

crank sensor likely-may be distributor sensor but my 98 sport was crank sensor situated in bell housing timed by flywheel

The timing belt might have slipped if it did you could crank until the cows come home and it wont start, thats the first place I would look,since yo have fuel and spark.

replace the crankshaft position sensor

Sounds like the crank sensor. One way to check is while cranking watch the tach. If there is no movement then most likely it needs a crank sensor. If the sensor is good you will see a slight bounce in the tach.

Engine Cranks But Will Not Start

For an engine to run, you need three things to happen inside the engine. Compression, fuel and ignition, without any one of these components the engine will not run.
Basic Checks:

A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)