I have gas and fire but it won't crank - 1988 Chevrolet Caprice

Crank sensor.should be on back side of engine on passenger side were bellhousing is. controls spark and fuel pump.

how much is the RPM showing in the datatlogger while cranking?

sounds like the fuel pump thats how they go try bangging on the gas tank it may have a rust buld up

Now that a mechanic, I assume tested your car & told
you what was needed,why are you here?

Crank position sensor...i have same car and that happened to me

Hi Thomas, Take the vehicle for a diagnostic scan. I suspect the fuel rail pressure regulator. There may be a grain of sand or other matter which sometimes allows it to discharge the pressure and thereby the fuel returns to the tank instead of remaining under pressure in the fuel rail. Regards John

Check the fuel line pressure it may be low should be 55lbs

Just because it get fuel,but does the fuel injector pulse? Add fuel in the throttle body if it wants to start your problem and solution will resie in bringing the fuel injector to working level

First of all, never pour water in the gas tank........

When water gets sucked up by the fuel pump, it then propels that water through the fuel injectors directly into the engine where water is not suppose to be. By doing this, you might as well return the spare parts that you have put on this vehicle, because more than likely it is just a junk yard scrap now. It won't crank, because gas is needed to make the spark plugs fire properly. Not water...

Is there any problem with it as well besides it wont crack back again?