After changing the water pump on a 2005 Kia Sedona and plugs and wires now it wont start..replaced crank sensor computerchecked timing more than twiceand a weeks worth of a headach

Time for a dealer.

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https://www.autocodes.com/qa/26619/p0172-p0175-p0431-error-codes-for-kia-sedona-2004-lx

If the engine wont crank when you turn the ignition it could be that the main fuse in the engine compartment may have blown if it does crank and wont start there could be one of many problems ie crank sensor,compression ,timing best to then have a diagnostic test done by an authorised dealer as you may find that you may replace all sorts of parts at unnecessary expense.

recheck the timing belt to make sure it was done right,if the belt slips your engine will not start, maybe it was installed incorrectly.

No this does not affect the fuel pump. It will affect the spark though. Hit the gas tank in the center a few times. If it starts then replace the fuel pump. Unfortunetly pumps with a few yaers on them will die when ran out of gas. If it doesn't start pull one of the spark plug wires, insert a screwdriver and put it close to the engine. crank the engine and watch for a spark. if there is no spark then replace the crank shaft sensor. before you replace the fuel pump.

At the front of the crankshaft. if its near time for the timing belt, you want to replace it along with any pullies, tensioner and water pump

The kia sedona water pump is an internal pump and needs to be replaced with timing belt service. if it is leaking, then you need to change the timing belt as well. probably not something you want to do in the back yard and will run you between 400 and 600 depending on your location and shop.
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We replaced the crank sensor and another sensor still nothing.

if the starter is revving very slowly it is the battery, charge battery. if not, It can be three things happing. 1 no spark 2 no fuel 3 no crank signal or the car computer is bad- you will need to unplug one of the spark wires and remove the spark plug and put the spark plug in the spark plug wire boot, and touch the spark plug on any metal on the car and have some start the car. donot touch the spark plug itself and see if there is a spark. if spark is bright, then it is not spark plug and wires but if no or spark is not bright, check the spark plug wires by applying a little bit of water on the spark plug wire and take a 12v test light, connect the clap to ground and and have some one to crank the vehicle, touch allover the spark plug wires with the tip of the test light, if you see spark, replace the wires and change the plugs.. they are not good. if spark is present, check for fuel by removing any one of the spark plugs and see if it is wet. if wet fuel pump is ok but if not go look for the fuel pump fuse and relay. is fuse blown, replace, check the relay resistor with a volt meter. it should be around 40 to 80 ohm. if everything is good from this point check the fuel pump itself by disconnecting the connector to the pump and apply 12v and ground using jumper wires or some wires to the fuel pump if you donot hear the pump,replace pump. if you, the crank signal or computer may be the problem