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yor fuel pump is located inside your fuel tank remove the back seat you wil find the way to the fuel tank before you start working on the pump disconect the battery to prevent any fire remenber you are working wev fuel dont smoke and keep the plaice ventilated take care wen disconect any pipes they are under pressure use safety glasses
yes you have to drop tank to replace fuel pump and filter as it is one unit pretty easy though.
crankshaft sensor is either under the harmonic balancer pully or bolted to block facing it you normally have to pull pully to change sensor but some you dont you will need a puller and a installer if you have to pull the pully
The fuel filter is located inside the fuel pump on a 2005 nissan altima. The fuel pump is under the back seat. You must remove the bottom cushion on the driver side. Before removing the fuel pump you must remove the negative battery cable and relieve fuel pressure
BEFORE YOU TRY TO START YOUR CAR, TURN THE KEY TO THE ON POSITION AND STOP TO HEAR A WHISSING SOUND COMING FROM YOUR FUEL TANK. IF YOU HEAR THAT NOISE, THAT IS YOUR FUEL PUMP ENGAGING AND IT IS WORKING FINE. IF NOT, YOU SHOULD DEFINITELY GET IT CHANGED. ITS A GRUELING PROCESS SO HAVE A MECHANIC DO IT. IF YOUR FUEL PUMP IS WORKING, TRYING CHECKING THE PRESSURE OF YOUR FUEL. YOU MIGHT NEED A NEW FUEL FILTER(IT CAN GET CLOGGED UP) OR YOUR FUEL PRESSURE REGULATOR MAY BE MALFUNCTIONING.