Katerina Swanson
The fuel pump on a 1997 Mercedes-Benz E320 is located near the fuel tank underneath the vehicle. Before replacing the fuel pump, it is important to check the fuses, relay, and fuel pressure. The pump is held in place by four 6mm inverted hex bolts with wave washers. To access the lower bolt, you will need to remove the two bolts holding the power steering pump in place. The upper bolt cannot be accessed with a socket and requires a hex wrench or a Mercedes-specific tool.
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What You'll Learn
Locating the fuel pump
To locate the fuel pump on a 1997 Mercedes-Benz E320, you need to look underneath the vehicle, near the fuel tank. Before replacing the fuel pump, make sure to listen for the fuel pump to run, check fuses, relay, and even fuel pressure if needs be. The fuel pump relay is under the rear seat cushion, attached to the side of the fuses relay panel.
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Checking the fuel pump is running
Before replacing the fuel pump on a 1997 Mercedes-Benz E320, it is important to check that the fuel pump is running. To do this, you should listen for the fuel pump to run, and check the fuses, relay and fuel pressure. The fuel pump is located near the fuel tank underneath the vehicle. You can access it by removing the bolts that hold the power steering pump in place. The fuel pump relay is under the rear seat cushion, attached to the side of the fuses relay panel.
To remove the pump, you will need to use a hex wrench or buy the Mercedes special tool made specifically for removing water pump bolts, which costs around $60. The four bolts that hold the water pump to the block are 6mm inverted hex bolts that have wave washers on them. Use a 6mm hex wrench with an extended length or a 6 mm socket. The two closest to the firewall are easy enough to get out. The two farthest from the firewall or closest to the radiator are the problem. The lower one can be accessed with regular tools only after you remove the two bolts that hold the power steering pump in place.
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Checking fuses, relay and fuel pressure
Before replacing the fuel pump on a 1997 Mercedes-Benz E320, it is important to check the fuses, relay and fuel pressure. The fuel pump is located near the fuel tank underneath the vehicle. The fuel pump relay is under the rear seat cushion, attached to the side of the fuses relay panel. You should also listen for the fuel pump to run.
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Removing the bolts
To remove the bolts on a 97 E320, you will need a 6mm hex wrench with an extended length or a 6mm socket. The two bolts closest to the firewall are easy to get out, but the two furthest from the firewall or closest to the radiator are more difficult. To access the lower bolt, you will first need to remove the two bolts that hold the power steering pump in place, then move the pump to the right and out of the way. The upper bolt is not accessible with a socket, so you will need to use a hex wrench or buy the Mercedes special tool made specifically for removing water pump bolts, which costs around $60. The four bolts that hold the water pump to the block are 6mm inverted hex bolts with wave washers.
The solid metal hose that feeds through the side of the water pump housing and goes to the heater controller is held down by a single bolt in front of the engine. It is recommended that you do not remove this bolt, but instead back it out enough to get the metal hose out of the water pump.
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Replacing the whole part
Before replacing the fuel pump, make sure to listen for the fuel pump to run, check fuses, relay, and even fuel pressure if needs be. The fuel pump is located near the fuel tank underneath the vehicle.
The four bolts that hold the water pump to the block are 6mm inverted hex bolts that have wave washers on them. Use a 6mm hex wrench with an extended length or a 6 mm socket. The two closest to the firewall are easy enough to get out. The two farthest from the firewall or closest to the radiator are the problem. The lower one can be accessed with regular tools only after you remove the two bolts that hold the power steering pump in place. The upper bolt is not accessible with a socket and you must use the hex wrench or buy the Mercedes special tool made specifically for removing water pump bolts which costs around $60.
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Frequently asked questions
The fuel pump is located near the fuel tank underneath the vehicle.
Before replacing the fuel pump, make sure to listen for the fuel pump to run, check fuses, relay, and even fuel pressure.
The fuel pump relay is under the rear seat cushion, attached to the side of the fuses relay panel.
This could be related to the fuel pump relay. Check the fuel pump relay and make sure it is functioning properly.
