How to Replace a Fuel Pump on a Volkswagen Passat (1999-2005)

Replacing the fuel pump on a 1998-2005 Volkswagen Passat (B5) is a job most DIY mechanics can do.

Before you buy a pump, make sure the old one is actually bad. Follow our step by step guide to test a Passat fuel pump here.

Once you know it is bad, keep in mind a special tool is supposed to be used to get the old one out and the new one in. I have changed one without the tool, but I almost broke it and it took 2-3 hours to finally get the new bottom half seated right.

The next Passat I do, I would order the tool first. It can be done without it depending on your skill level, but the new unit is easy to crack if it is not turned in correctly.

Note: Disconnect the battery before you open the fuel pump. Gas is highly flammable. Work outside or with good airflow, no sparks, and the tank as low as you can get it.

Relieve leftover fuel pressure before the hoses come off. The fuel pump fuse is usually #28 in the driver’s side dash panel (confirm it in the owner’s manual), pull it, and let the engine run until it stalls. Crack the gas cap too.

Where is the Passat Fuel Pump?

On a front-wheel-drive B5 Passat the pump is in the trunk, passenger side, just behind the rear seat. Pull the trunk carpet and you will see a round cover held by three Phillips screws. That is what these photos show, sedan or wagon.

4Motion (AWD) cars are different. The pump is under the rear seat cushion, not in the trunk. The trunk hatch on those is often just a level sender.

Steps to Replacing a Fuel Pump on a Volkswagen Passat (1998-2005)

1. The fuel pump is located in the trunk and needs three Phillips screws removed from the cover.
   
2. The power harness needs to be removed.
   
3. The hoses need to be removed. Have a rag ready. There is usually still fuel in the lines.
   
4. The clamps that hold them in place sometimes need to be replaced since they can be a pain to remove and often need to be cut off. Screw-type clamps work for reassembly.
   
   
5. There is an arrow marking the placement of the fuel pump. Be sure to mark where it is pointing before anything else comes out.
   

How Do You Get the Lock Ring Off?

6. A large plastic ring holds the top of the assembly in the tank. It comes off by turning it counter-clockwise. A screwdriver or similar is usually needed to tap it loose.
   
7. The top part of the fuel pump assembly (the flange and sender) will come out, but the bottom part will still be stuck inside the tank.
   

How Do You Get the Bottom Half Out of the Tank?

This B5 setup is two pieces. The top is the lock-ring flange and sender. The bottom is the pump sitting in the tank reservoir.

8. The next step is to get the bottom half out of the tank. On this one that was done by turning it to the left (counter-clockwise) until it unlocked, then lifting it out. Go easy. That plastic housing in the tank is what cracks if you force it.
   
9. Putting the new fuel pump in is the reverse of taking it out. Line the arrow back up the same way it came out.
10. One problem is the new bottom half of the fuel pump can be difficult to get into place. This is where the special installation tool comes in handy if you have one. If you don’t, it is a good idea to order one, since the new unit can be easily broken if it is not inserted correctly.

The tool for this B5 Passat is VW / Baum 3307, a fuel pump removal and installation wrench. That is not the later T10120 used on newer VWs. I tapped the lock ring off with a screwdriver. The part that almost broke was twisting the new bottom half into the tank.

A common in-tank pump for a FWD 1998-2005 Passat 1.8L / 2.8L is OEM 8E0906087D. Match the number on the old unit. 4Motion and W8 pumps are not the same part.

Put the fuel pump fuse back in, cycle the key to on a few times to prime the pump, then start it and check for leaks before the cover goes back on.

Have you replaced a B5 Passat fuel pump with or without the 3307? Let us know your thoughts below.