My jeep won't start. Put a brand new battery in, the alternator and the starter is good. Put a new fuel pump in and replaced the sparkplugs and it still won't start. It sounded like it want to start but it won't.
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Have you checked for correct fuel pressure? Most parts stores have a loan-a-tool fuel pressure gauge kit, and if you remove the plastic engine cover you will find a fuel rail port to attach the tester. Just because you replaced with new pump, don't assume it is good. Many cheap aftermarket pumps are noisy and fail often.
If pressure is good, insure you have spark to the plugs.
Have a friend turn the key for you and listen by the fuel tank to hear if the fuel pump comes 'on'. It you don;t hear anything... you know it's not working. Get the Haynes Manual and unconnect the fuel pump and use a simple (cheap) multimeter to measure voltage to make sure it's getting power, if it is, needs a new fuel pump. If it doesn't, you'd better check the fuse and relay. Sometimes the ignition switch itself is faulty.... the fuel pump is connected directly to the ignition switch, if it's not getting power. (There are two main grounds, one at the starter and the other at the battery/fuse box... make sure they are corrosion free.) Was the new ECU synched with the VIN and odometer loaded into the memory? If not, the pro didn't do it right and the vehicle will never start until it is.
There should be a solenoid/regulator on the firewall that's connected to battery wires (possibly $13 part), and starter wire..a tap on that like you would a starter when it gets stuck; unless it's built in with your alternator or generator...the only other thing I can think of, is that you have a loose connection, or a bad item/rebuilt item? Starter and alternator new? A place like Sears Auto or a mechanic who has a computer to check charging system could give a better idea...good luck..
check fuel pump fuse and relay also the fuel injection fuse and ecu fuse, if they are ok remove the back seat and you will see a cover remove the cover and check for voltage at the pump plug and ground, you hear the pump work if not need new pump
You might not believe this, but check your battery. Some of these vehicles have cut-outs when the battery level goes below a preset amount.
I work on Ford brands and on them, a low battery level will even disconnect the Alternator circuit and mess with the starter. Some even act up when the battery slightly dips below 12 volts.
Your antitheft can make your starter cut out. And If you think about it, all of the measurements to make the engine run are based on feedback of voltage and amperage. This is how the engine management system adjusts. If your prime source of power is low, then all of the following electrical readings will be low. Some may be too low to work.
Your fuelpump will hold pressure in a closed system for hours. The fuel pressure regulator will command the fuelpump to stop working if the fuel pressure is at maximum. Without responses from the other components and after satisfactory pressure, the fuelpump will turn off.
The Jeep DTC P1491 code is actually radiator fan control relay circuit. Soft reset if the battery disconnect would have erased the code; the first thing I would replace for that code (fan relay). Additionally, its possible thta your THEFT system is activated, check owners manual to disarm. Hope this helps.