1999 montro when cranking the battery started to leak

Question edited for clarity and fix typo.
Question moved to model category.

'Cranking' is purely the engine turning over. It cranks, almost starts and then it does nothing next time you turn the key? Flat battery.

Or, you turn the key, it cranks, fires and almost starts and then dies? More reasons for that scenario. Check for diagnostic trouble codes. Did you disconnect the battery when you replaced the fuel pump? Did it work after that? Does it have an engine immobilizer and did you reset it after the disconnect?

https://www.google.com/search?q=1999+Chevy+Blazer+crank+no+start

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Sounds like you aint getting no spark, spark plugs or cap is what I would check.

IT IS LOOKS LIKE A FUEL PRESSURE LEAKING INSIDE THE ENGINE OR DEFECTIVE FUEL INJECTOR LEAKING . TRY DISCONNECTING THE FUEL PUMP RELAY. AND CRANK THE ENGINE IF ALWAYS CRANK WITH OUT OF FUEL (CRANK WITHOUT START) YOU HAVE FUEL LEAK INSIDE THE ENGINE
REMOVE THE INJECTORS RAIL UP EVERYTHING CONNECTED,PUT BACK THE FUEL PUMP RELAY TURN THE SWITCH ON AND FIND WICH ONE IS LEAKING. (GASOLINE IS FLAMMABLE TAKE CARE)

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Low fuel pressure or ignition module

Does it only do that when the weather is cold?

If it does, it could be the fuel pressure check valve has a leak. One way to check it is to turn the key to the run position for 5-7 seconds before you start the engine. If it starts, that should be the problem.

If it still doesn't. You might have to reset the fuel pump. You can do this by removing the fuse from the fusebox in the engine compartment (it's a 15 amp fuse. I think it's # 17) With the fuse removed, crank the engine twice but make sure you don't hold it too long as you don't want to drain the battery. Two 3 second cranks should be good.

Put the fuse back in and start the engine. Should start then. Hopefully that solves your problem. I'm having the same issue and that is how I start my truck whenever is doesn't want to start. Seems like it only happens when I haven't started it in a while but seems fine when I start it within 4-5 hour intervals.

Go under the dash and bypass the clutch pedal safety switch and see if it starts.

there could many different problems. do you have any check engine codes? if so have them checked out, because a sensor may have failed causing the engine not to start. then you need to check the fuel pump. stand by the fuel tank and have someone turn the key on, but dont start the car. listen very closely you should hear a small electric motor run for about 5 sec. if you dont hear anything, check the fuse and the relay. when you turn the key on the relay should make a fairly loud click. if no sound is heard the relay needs to be replaced. if you still dont hear the motor your fuel pump has failed.

I would be checking the wires to the computer for broken or corroed wires. A good place to start looking is under the battery cause acid that leaks down from the battery can corrod wire and fusible links. hope this helps Good luck

while you state the battery is "strong" what kind of voltage are you getting to the starter solenoid