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Asian Cars
Fuel Pumps
Chevy S-10
Nissan Pathfinder

How do you change a fuel pump in a 98 Nissan Pathfinder?

Answer

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Wiki User
November 11, 2007 3:17PM

The fuel pump is in the fuel tank. There is an access port that resides under the back seat (drivers side). It can be use to replace and inspect the fuel gauge sensor. You can replace the fuel pump through this access port. The manual says to access the port.."flip the rear seat cushion up and forward, then remove the inspection hole cover." Before disconnecting the fuel lines you can remove the fuel pump relay or the fuel pump fuse and run the engine till it dies. Then crank the engine a few times to release any pressure in the lines. You can test the phyiscal function of the fuel pump by attaching a fuel pressure gauge to the front fuel line under the hood. The rear line is the return line and won't carry much pressure. There is no schrader valve on most of these nissans. Turn the key on but don't start the engine and the fuel pressure should rise to 40lbs. Start the engine and let it idle, there the fuel pressure gauge should read 35 give or take a few pounds. As you rev the engine the pressure should fluctuate between 30 and 45. If this all works as such then the fuel pump and pressure regulator are good. You can also appy an Ohms meter across the fuel pump leads and test the electronics of the pump. Should be .2 to 5.0 Ohms (at 77 degrees). DISCONNECT THE BATTERY before beginning any service on the fuel system.