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Check the crankshaft position sensor, i have repaired 3 Jeeps (after the owner spent a lot of time and money replacing fuel pumps,TPS, and many other items) then got frustrated, brought it to me and within an hour it was running fine with a new CPS
It does not have an obd11 connector, it's too old. The extended crank time could be a couple of things though. I've seen problems with fuel pumps, fuel pump relays and crankshaft sensors. How many miles on it? Has the fuel pump or filter been changed before?
Having same issue with my 2000 grand cherokee. sometimes fuel pump will prime and car starts the other 50% of time no fuel pump noise only smaller radiator fan will come on and make vibrating whining noise. I have changed out fuel pump and filter as well as checked and ruled out all fuses/relays involved. Need help too
the fuel filter is usually located under the hood by the intake manifold and attached to the firewall of the car. the pump is located right by the fuel tank and if you cant see it then its inside the fuel tank. (you will have to lower the fuel tank down to get to the pump.)
What you are looking for is something that is turning off power. check ignition switch and connections at the computer (have you done any testing before changing parts?)
Get under the vehicle and start at the fuel tank and go forward you will find it. If its a Grand Cherokee Laredo the fuel filter is located inside the fuel pump so the whole fuel pump has to be replaced
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