I think my fuel pump is failing on a 98' dodge ram

Question edited for clarity.
Question moved to model category.

In the link, but you could test it with a multimeter or a test lamp.

all the wiring

https://www.justanswer.com/dodge/343b4-98-dodge-ram-2500-fuel-pump-had-12v-cranking-relay.html

More here

https://www.google.com/search?q=2000+Dodge+Ram+2500+fuel+pump+wiring

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Question edited for clarity.
Question moved to model category.

6 wire wiring

https://www.pirate4x4.com/threads/i-need-a-couple-schematics-fuel-lines-and-the-wiring-to-the-pump.1059343/

4 wire wiring

https://www.2carpros.com/questions/dodge-ram-1998-dodge-ram-fuel-pump-electrical-connection

https://www.google.com/search?q=1999+dodge+ram+1500+fuel+pump+wiring+diagram

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no ca/truckr model told at all, of many 3 or 4.
no engine told and is and engine problem.

the VIN digit #8 is the engine code

NO model told.
ram 1500 ?, 2500, 3500 or 4000 , and not the Ram van. 1998 (4000 Mexico or Canada)
no engine told one is Diesel;,
3.9 L Magnum V6
5.2 L Magnum V8
5.9 L Magnum V8
5.9 L Cummins turbo-diesel I6<<< ill not cover this ever.
8.0 L Magnum V10

does the starter motor always work correctly every time, called cranking?

we get the fact it does not start. sometimes
but what is not clear, at all, is that the starter always makes this sound called cranking? or fails to do cranking

see MP3 post

If you are getting a check engine lite code have it checked. Auto part stores where I live will check it for free. A shot in the dark makes me think fuel problems. check fuel filter/pressure.

The way the newer systems work the engine spins at least a few turns while the computer checks everything for correct readings. In the old days it was "cool" to be able to reach in and "bump" the key and have the car start. It meant you had the car tuned perfectly. Now the vehicle computer will not turn fuel on until it is happy with readings. One trick you can try is turn key to full on position and let it sit for a second or two before turning key the rest of the way to crank. This allows the system a second to do it's checking without wasting power cranking. Had Nissan that was just like this. Just wait a few beats before turn to full crank. You can also listen for fuel pump whine in that few seconds, and then hopefully whine to stop when pressure hits full. If whine never stops fuel pump may be getting weak. If you can get access to higher end code reader you can also check for "pending" codes that may be showing up sometimes (holding start up) but then working (so engine finally fires).

There is a check valve inside the fuel pump module that is suppose to keep fuel pressure in the fuel line's an fuel rail . Need a new fuel pump .

intermittent no start situations generally appear when you have defective crank position sensor (since it cant get idea what the crank angle is) and fuel pump issues( since it cant receive enough fuel)

This may be due to the fuel pump pressure check valve being defective. When the valve malfunctions it allows fuel to drain back out of the fuel line, then you must purge the line of air and fill it with pressurized fuel, this takes a few moments and this causes abnormally long crank times before the engine starts. I think on your truck the pressure check valve is on the top of the fuel tank, if not it is inside the fuel tank and part of the fuel pump module assembly, any parts store like NAPA or Carquest can look this up for you and find out if you can just replace the pressure check valve and not the whole pump module which is quite expensive.

change the fuel filter first

The lift pump is bad Check the fuel pressure with a test gauge.