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Re: no fuel getting to the engine. Probably need a
Try checking the Inertia sensor in the trunk. It is on the side of the trunk next to the air suspension button. Press the top button down for 2 seconds to reset the inertia switch and try to start the car then.
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Fuel pump pressure at the carburetor or injectors is probably too low. Check/replace the fuel filter to eliminate the possibility of a clogged fuel filter being the culprit. After you do that and still no improvement, check the fuel pump pressure. Still too low? Probably need a new fuel pump.
Disconnect the electrical connection to relieve the system's pressure. Start the Navigator and let the engine run until it stalls from lack of gasoline. Turn off the ignition, reconnect the pump's electrical connection and disconnect the negative battery cable.
Detach the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.
Twist off the fuel pressure test port cap and secure a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. The pressure gauge needs to read 45 psi when at wide open throttle. High pressure readings indicate a malfunctioning pressure regulator. Low pressure readings indicate a clogged fuel filter or a broken fuel pump.
Cut the engine. Relieve system pressure and remove the negative battery cable again so you can safely remove the fuel filter to check for clogs.
Loosen the filter fittings and unhook the fuel lines from the filter. Undo and remove the bracket on the fuel filter.
Inspect the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably a faulty fuel pump.
Then either the fuel pump has failed, fuel filter is clogged, fuel pump relay is bad, or the fuel pump fuse is blown. Sit in the car in a very quite area or with someone listening at the fuel fill area with the cap removed and turn on the ignition without starting the engine. The fuel pump should come on for a few seconds and then shut down. If it does not then check the fuse and the relay. If it comes on then you know the fuse and relay are good. Replace the fuel filter. If that does not help more than likely the fuel pump is bad and needs replacing. The pump can run and still not be pumping any fuel. A fuel pressure test will verify if the pump is for sure bad. You have an 11 year old vehicle so it would not be uncommon for the pump to go bad especially if the filter has been neglected. A partially clogged fuel filter will destroy an otherwise good fuel pump. You will have to remove the fuel tank in order to replace the fuel pump. Use a hand pump to remove as much fuel as possible from the tank as gasoline weighs around 8 lbs per gallon. The less weight the better. Good luck and Merry Christmas.
You should replace the fuel filter - it is probably clogged with debris from the bottom of the gas tank. If this does not fix the problem, the fuel pump may be clogged or burnt up. Either way, it will need to be removed from the tank. If you can hear a hum coming from the fuel tank for a few seconds when you first turn the key on, then the pump is most likely ok. You can clean the filter on the inlet and reinstall the pump. If not, you will have to replace the pump. On second thought, once you get the fuel pump out, you may just want to replace it and chalk it up to preventive maintenance. Also, have a serious talk with someone about putting gas in the tank when it gets low.
- Fault codes from the diagnostics system.
- Fuel pump relay, located under the fuse box cover under the hood. If it's a green one labeled 103 it might be the culprit and should be replaced with the new and improved red one.
- The fuel pump itself, measure voltage to the fuel pump and make sure it's getting sufficient power. Can you hear the pump working when turning on ignition?
- Fuel filter might be clogged up. Located under car, by the right rear wheel.
- Unaccounted air entering through vacuum hoses. Spray them with start gas while the engine is idleing, if engine revs up you've found a leak.
- Throttle body might be in need of cleaning, probably a good idea anyway as it usually gives the engine a tad better performance.
- Mass airflow sensor might need replacement or cleaning of connector.
- If idle is rough check idle control valve.
- Make sure all plugs are firing, engine might be missing one cylinder, causing it to vibrate depending on engine RPM.
- Check that coil is ok.
Your problem doesn't sound like a camshaft/crankshaft position sensor, but you never know. Have the codes read, that'll probably help alot!
Well, that should give you some idea as to where to start checking...
Good luck mate!
Well to me it sounds like it could be a couple of things. A weak fuel pump is probably the biggest clue. I had this same issue in my 1997 s-10, at engine speeds of more then 2500 rpms the fuel pump couldnt feed the engine enough fuel, causing it to hesitate, spit and sputter in some cases under heavy take offs it would stall. Also it could be a dirty fuel filter, air filter, or clogged fuel injectors. let me know if any of these suggestions work.
Make sure you have not installed the new fuel pump in backwards. It's a common mistake. Also FRAM changed their manufacturer for the fuel filters. The FRAM filter does not allow the correct amount of fuel to get into the line. They do not do Jeeps any justice at all. Make dure you get a MOPAR filter.