2008 Jeep Grand Cherokee 3.0 Mercedes CRD will not start

Question edited for clarity. Cranking IS turning over. You are cranking but not firing, or starting, or running.

If you haven't much pressure at the rail, your likely problem is not enough fuel pressure and the fuel pump needs replacing. One post here says you need 39 PSI and another says 49 PSI. What do you have? You need to test with a pressure gauge.

https://www.google.com/search?q=1994+jeep+grand+cherokee+laredo+4.0+fuel+pressure+specs

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ive seen this happen and seen 50 causes
what i the point if guessing 50 answers.
on 2 major paths of failure
wont crank
wont start but cranks ok,
is this a diesel>?
OP never said what engine is there.
wk jeep usa
wg jeep europe. 3.0 L Mercedes Benz CRD
really we are clueless to guess, what is under that hood
truly...
nor if it cranks
nor if the IMMO lamp is off
nor if fuses are good.
if gas, engine , tuned up in the last decade?

define power.
1: can't hear buzz?
2: fuel pressure at the fuel rail is zero PSI cranked.
3: my volt meter tells me the pump has 0vdc across the pump pins cranked?

I cant guess any of this and is 100 %^ Germain.

did you all jeep:?
call them all and ask for international shipping.
they all have email. , all, google for Jeep dealer, click parts, click email.

Check audibly the fuel pump. It will run for 3 seconds when ignition is turned on, but engine not started. If it makes noise, you could check for pressue at the fuel rail. There is normally a schrader valve you can press. Tske care, fuel under pressure will come out when pump is ok.
if ok, check for eventual fault codes with scanner.
could be crank sensor.

Your Jeep has what's known as the delayed start, no check engine light problem. The Jeep will not start until the check engine light comes on, on the dashboard. Next time it cranks but will not start, look at the dashboard to see if the check engine light is illuminated. If it's not lit up, then your Jeep does have that problem and your Jeep ecu is in need of repair or replacement. There are components inside the ecu that are going bad and will continue to get worse, eventually leading to a permanent no start condition. There are ecu repair services and replacement ecus on ebay.

Check for a feed wire from the battery that is bad. Fuseable links. Feed the fuse box directly from the battery to see if it will start.

Check your fuel pump ,fuel lines,.One of the most overlooked starting causes is fuel delivery. Find the fuel rail to the injectors. Assuming you don't have a fuel pressure gauge, remove the dust cap on the fitting on the fuel rail and press the center pin in the valve to see if there's a good amount of pressure for a very brief second. There will be no continuous pressure unless the engine is running or is being cranked over. Have somebody crank it for you for a second to see if high pressure is present.

If not, first look at the fuel cutoff switch usually located in the inside stowage compartment of the vehicle. See if the reset button clicks when you press it. Next check the fuel pump fuse and relay, and finally the pump itself could be bad.

THE THINGS YOU MENTIONED WON'T AFFECT CRANK SPEED. YOU'RE BATTERY IS PROBABLY ON THE WAY OUT THE DOOR. LOOK FOR CORROSION AND LEAKING BATTERYLIKE AROUND TERMINALS AND POSTS. BATTERY IS PROBABLY LOW ON CCA'S. NOW IF TALKING ABOUT WON'T START AND TAKES LONG CRANK TIMES IT CAN BE FUEL PUMP LOSING PRESSURE IN FUEL RAIL OR LACK OF FUEL PRESSURE CONSIDERING WHAT YOU MENTIONED. EVAP SOLENOID WILL USUALY SET A CHECK ENGINE LIGHT AND WONT AFFECT STARTING USUALLY UNLESS YOU HAVE A HUGE VACUUM LEAK

First install a fuel pressure tester on the fuel rail and check the pressure during crank. It should be about 30 psi.If the pressure is not good then it could be a bad fuel pump relay or fuel pump itself (in the tank).
If the fuel pump pressure is good then you could have a bad crank sensor.