How to replace a Mercedes Benz fuel pump?
How to replace a Mercedes Benz fuel pump?
Be prepared for any gas remaining in the line of the pump to spill out. Use a 17mm wrench to hold the pump and another 17mm wrench to remove the bolt (red arrow) through the banjo fitting (yellow arrow). Remove the fittings from the pump. Note: always replace the brass washers between the fittings on the lines.
Where does the fuel go in a Mercedes 190E?
With the cover removed you can see how the fuel flows from the tank to the engine. The main supply line comes from the tank and enters the first pump (yellow arrow), it exits the first pump (red arrow and enters the second pump (purple arrow), the fuel then exits the second pump (blue arrow) and is sent to the fuel filter.
When do you need to change your fuel pump?
Your fuel pumps are an integral part of the fuel delivery system. A clogged or faulty pump can cause all kinds of problems, from a rough running engine to leaving you stranded on the side of the road. It is a good idea to change your pumps at the first signs of it going bad (trouble starting).
How to stop the flow of gas in a Mercedes Benz?
Place a large hose clamping tool on the input line (red arrow) to stop the flow of gas. If you do not have the proper tool you can try wrapping vice grips in a rag to pinch the line. Do NOT put the metal teeth against the rubber line.
Be prepared for any gas remaining in the line of the pump to spill out. Use a 17mm wrench to hold the pump and another 17mm wrench to remove the bolt (red arrow) through the banjo fitting (yellow arrow). Remove the fittings from the pump. Note: always replace the brass washers between the fittings on the lines.
With the cover removed you can see how the fuel flows from the tank to the engine. The main supply line comes from the tank and enters the first pump (yellow arrow), it exits the first pump (red arrow and enters the second pump (purple arrow), the fuel then exits the second pump (blue arrow) and is sent to the fuel filter.
Your fuel pumps are an integral part of the fuel delivery system. A clogged or faulty pump can cause all kinds of problems, from a rough running engine to leaving you stranded on the side of the road. It is a good idea to change your pumps at the first signs of it going bad (trouble starting).
Place a large hose clamping tool on the input line (red arrow) to stop the flow of gas. If you do not have the proper tool you can try wrapping vice grips in a rag to pinch the line. Do NOT put the metal teeth against the rubber line.
