99 durango 318ci. cranks but won't start. New fuel pump 3wks ago, 50psi. New cap and rotor yesterday. No codes

Please read my notes at the link.

You might check for a fuel shut off valve. Some vehicles have them in case of an accident, it turns off the fuel pump. Some are just a relay that can be reset.

run the fault codes and see what comes up . IT may be that there is a low fuel pressure problem from a pump that is not getting a true voltage until the alternator is charging.

are you getting FUEL ? are you sure ? you might need to replace both the air& fuel filters !!!!!!!!!!!!!!!! fuel pump may be bad !

Check that the crank shaft position senser is plugged in and working and not broken this will cause your comp to not send fire to you coil and it won't fire hope this helps you

pull one ignition cable out of cap just enough to see the tip of connector and crank it, a spark should jump from cap to tip of wire. no spark means you need the whole distributor replaced. buy it from nissan or infiniti dealer, it comes with cap rotor installed and 12 mo 12k mile warranty, no matter who installs it. dont waste time with aftermarket rebuilt distributor, those are not reliable. https://parts.infinitiusa.com/

you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.

Check the fuel pump when you turn the key forward but dont crank it and see if you hear the fuel pump engaging. I hope this helps.

Andy

not enough compression needs around 150 each those are known for head gasket problems

The coil pack modules are a common red flagged problem when they heat up. If you could get some one or your self to take the part off, easy to do, you can get it tested at your local napa for free. Other wise, if you give me more information, I may or may not be able to help.