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check the sensor probe for the temp.. replace with new one if it is bad . and for the gas level gauge , it is inside the gas tank connected to the fuel pump . you have to check the float and the coil . replace the whole fuel pump unit if it is bad. thanks ..
Several things may cause this to happen:
first check your gas cap is securely tighten after refilling sounds silly but may work.
Can be a gas line broken that not necessarily should leak.
Also can be a gas pump malfunction, check for a loud humming coming under the back seat while engine running. If you confirm this loud humming noise try replacing the pump unit (not the whole harness wich is far more expensive).
Hope this will help
take out the back seat(bottom part) or pull back the liner in trunk. You should see a small panel. Unscrew the panel cover to reveal the fuel pump. Remove it SLOWLY and be careful of plastic parts, they snap easy. Just remove and reinstall, its pretty simple. Make sure the is no full of gas, it will be everywhere.
Sounds like a bad fuel pump, check if the smell comes under the rear wheels and also check for a loud humming noise when the key is turned to on. Those are signs of a bad fuel pump.
If it drives at highway speed....you do not need a pump. Do you have a "check engine" light on? Hopefully you do....as it will show you a code to help cure the problem. I would start with a throttle body cleaning.
If you want to access the fuel pump......remove the back seat....bottom seat. Remove the cover on the floor.....under the seat.....there's the pump.
Fuel filter is inside the gas tank and its built into the fuel pump housing. You need to remove the back seat and get into the tank via access hole under the seat. Than you need to "split" the fuel pump assembly open and get the filter out. Reverse procedure to assemble. Those filters are rated for 105k miles. My 00 Maxima has 167K on it and it runs just fine with the original. As far as the air flow meter , its a pretty common part that fails and that's why 00 Max air flow meter costs only $100 and all others $500 or more. If you replace an air flow meter, make sure that you use a "NISSAN" air filter or YOU WILL BE replacing the air flow meter AGAIN. Also with the new air flow meter the cars ECM/Computer needs to be reprogrammed. As far as plenum gaskets leaking?? unless someone had it apart and didnt put it back together the right way, its "VERY UNLIKELY" for those gaskets to be bad. Totally bullet proof.
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