My 1991 Jeep Cherokee will not start. It is a six cylinder 2 wheel drive. Some say its the fuel pump or the fuel pump relay. It will start up sometimes but immediately dies. How do I find out which one it is? Any solutions on how to see what is exactly wrong.
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Check to see if the fuel pump is running after it shuts down...could be a relay or the pump itself (overheating internally) Checked the fuel filter yet? Some crank sensors need to be shimmed. If it's too close to the flywheel even though you recently changed it, if it's too close to the wheel it can fail again. May not be the case but worth checking over. Also check the ceramic resistor on the left fender near the master cylinder if you have one. That too can cause problems.
You probably have a dead cylinder. like if you have a six cylinder it might be running on only five. could be because of a bad spark plug, ignition coil, fuel injector, plug wire. you should get it checked out.
Check the in line fuel filters. Dirt and debris can clog the filter under vacuum pressure from fuel pump and starve the engine. After the car sits and the vacuum is released, the debris falls away from the filter allowing the fuel to pass thru the filter until it clogs up once again. There are also in tank filters but more than likely the culprit is the inline. They are pretty inexpensive and easy to fix.
I just posted a simular resonse in another post. What is sounds like it that the fuel pump is starting to go bad. When it heats up after use the pressure drops not pusing the full amount of fuel. Whenits cold it works fine until it heats back up 10-20 mins. remember fuel in the tank helps cool the pump so keep it soewhat full but sounds like the damage is done. your probally gonna have to replace it.
First, check ignition system...cap, rotor, wires & coil. You may have some arcing going on there. If plugs are not recent, take a look at them as well...even if they are good, they can often tell you which cylinders are having a problem (wet with fuel, heavy deposits or just "different" from the rest) You may not hear the fuel pump come on all the time if the pressure in the line is not bleeding down. I would take a look at the relay first (power in & out). If fuel filter is more than 1yr old change that. (routine maintenance regardless of problems) Pressure test system if in doubt. Make sure idle air system is clean and do a quick test on crank sensor (a known problem area). likely something here will get you going.