Cleaning the fuel pump VW Passat B4

I’d like to tell you the way I performed Volkswagen Passat B4 fuel pump cleaning. I decided to look at the fuel pump state due to recent vehicle break. I managed start it in 20 minutes while checking what was wrong with it. I made a lot — twisted the spark plugs which were dry, also i checked the spark.

Therefore, I concluded that either the pump does not perform or the injectors do not open. I decided to start with a gasoline pump… and I was right. The fuel pump mesh was very crammed, therefore I started to clean Passat fuel pump mesh.

Just a little of petrol, cross screwdriver and pliers are required in order to remove and clean the gasoline pump assembly immersed in the Passat B4 tank.

First remove the power connector and then spin the starter in order to relieve pressure from the system and avoid spraying the entire cabin with gasoline while removing the hose.

Take a look at the pictures and read their description to learn more clear Volkswagen Passat B3/B4 fuel pump removing and fuel grid coarse cleaning way.


Now unscrew the key with a cross-head screwdriver.


Suck up all the dirty while using a vacuum cleaner.


Now unscrew the pump cover (it’s possible to use a wooden spacer and a hammer), disconnect the hoses and the connector (while using the pliers).


Then gently lift the cover, the one, which the chip is fastened to, the fuel hose fittings and the float itself from below.


It’s required to act very carefully, but confidently in order to pull the fuel pump assembly from the tank. Rotate it counterclockwise by 30 degrees (take out carefully the way to avoid the fuel gauge knocking down). There is a special seat for it at the tank bottom, therefore, not always everyone is able to understand the way this fuel pump stands there. Press it and turn clockwise in order to install it back (the float must be directed to the north).


Then take out Fuel Level Sensor (FLS), while turning the pump body counterclockwise by 30-40 degrees, remove the entire pump assembly.


The grids themselves are located on the pump inside the flask, so be sure to disassemble it and pull out the fuel pump in order to get to the grids.


Now remove the hoses, the fixator and the gasket (remember the retainer location way, since it must be correctly installed by aligning it with the body protrusion).


The fuel station cover is fastened with plastic latches, they can be easily hooked and snap off while using a flat screwdriver. Once having removed it, it becomes possible to remove the pump with the mesh.


One mesh was tightly packed.


Others — not so much. Now disassemble the entire pump while washing and flushing it (avoid overdoing the pressure).


Now assemble in the reverse disassembly order.


Install it back into the tank including orienting the arrows opposite.Now tighten the fuel pump, connect the hoses and connector, then try and close the flap.

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