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Hello travis.... The fuel filter is actually in the fuel tank and is accessable. On the 2004 Kia Optima EX, 2.7L automatic there is an access cover behind the back seat in the trunk. Another individual I spoke with said his was located under his back seat. This all depends on engine, year, model.
There is a hatch in the trunk behind the rear seats - remove it and the top of the tank is exposed where the fuel lines go into the tank and down to the pump.
If your vehicle is a coupe, the fuel pump shut-off switch is located on the right side of the trunk behind the trunk liner. If your vehicle is a sedan or wagon, the fuel pump shut-off switch is located in the driver’s foot well, behind the kick panel.
If there is one it will be in the trunk under the carpet. I don't recall those year ranges having it, but it may. There should be some type of metal/tin plate that is held down with bolts or nuts, that will be the access cover.
I recently changed my head gaskets and exhaust gaskets but now that I put it all together it does not stay running, Do I have my firing order wrong ? Also can I have a picture of how the wires should be placed
At the battery there is a tan or brown wire that if you touch it to the pos battery post should make the pump run. This bypasses the relay. Also, you can put a fuel pressure tester on the injector fuel rail - there is a connector that looks like an air pressure valve. Turn on the key and the pump should run. Pressure s/b typically arount 36 - 45 lbs. The motor will run with pressure down to about 28 - 30 lbs although maybe not very well. Below about 24 lbs it will simply not run at all. Sometimes when a pump goes it quits entirely, and sometimes it just gets tired but doesn't stop completely.