95 Coupe won't start

[Lenny 95 Coupe]

The car was driving fine till it just revved a bit then died once moving. I checked the tranny fluid level and it was low (this is my wife's car). after adding fluid we tried to start it but it just turned over. I listen to hear if the fuel pump is priming, but it's not. I switch the fuel pump relay w/ the DRL relay from my Blazer(same #s on both relays) still no prime. I then check all the fuses, but they are all good. I use a can of starting fluid and it runs till I stop spraying.
I dismiss it as a faulty fuel pump and change it w/ one I got from the bone yard. Once I got the old pump out, I test it, and the damn thing works
I replace it anyway since the one from the bone-yard is outta a newer Cavi.
After all is said and done still no start. will run on a can of starting fluid but not on its own.
I hard wire the fuel pump and it still wont keep running after I stop spraying the staring fluid. I do hear fuel going thru the fuel rail when it is hard wired though.
I read a few "no start threads" and thought maybe it's the fuel pressure regulator.
But why wont the pump prime on its own?
Maybe it the wiring or a bad ground.
I will replace the regulator, fuel filter (again) and all the grounds I can find.
Please excuse my rambling I just got some bad news about a family member on top of this.

[BlazerLT]

Make sure the strainer and sending unit is not the fault or a bad ground.

Also, make sure the newer pump has the same pressure as the 1995.

[public]

Check your oil level. Also check the oil sending unit. If this engine looses oil pressure the module will not fire the injectors. Good Luck.

[Lenny 95 Coupe]

Is the oil pressure sending unit on the front of the oil pan? I found voltage there at the wire's w/ it unplugged. And I got for continuity at the sensor. but still no fuel pump priming.

[public]

The oil sending unit is on the back of the block, under the intake manifold. I believe what you found is the Oil Level Sensor.

[Lenny 95 Coupe]

ok thanks , guess, the wife will be driving the Blazer for a minute. It's been raining all week, And the car is parked out front in the street.

[Lenny 95 Coupe]

OK. How do I check the oil sending unit? my guess is to do it once it's removed from the car. or to get a plug/wire for it from the j/y and test for continuity(sp) before,while , and after cranking the engine over.