Porsche 911 engines need a steady supply of fuel at the correct
pressure for good performance. If the hum
from your fuel pump is getting louder, it may be a sign of imminent failure. When you order your new fuel pump, be sure to get
two new copper sealing rings. (Figure 1) Here is how to
The first step in doing any work where the fuel system will be
opened is to position the car away from any possible sources of ignition, such as a gas
water heater, because you are likely to spill some fuel.
Next, place the front of the car up on jack stands. (Figure 2) You need some room to work under the car, so the
car should be near the maximum HEIGHT of the jack stands.
I usually place them as shown (Figure 3), with a
piece of wood to protect the car.
The fuel pump is located above the splash panel between the front
wheels. To remove the splash panel, take off
the two 17mm nuts, and the two 8mm allen-head bolts.
This panel is a bit heavier than it looks, so be sure to support it when you
take off the fasteners. (Figure
To remove the fuel pump, disconnect the two electrical wires,
taking note of which is positive and which is negative.
Then unscrew the 19mm cap nut that holds the fuel outlet line (you may need
to counterhold this fastener with a 15mm wrench).
Loosen the hose clamp holding the fuel pump, and you are ready to take
off the pump. Loosen the clamp holding the
fuel input line, remove the pump, and replace it with the new pump. You will need to work quickly during this part of
the procedure to prevent spilling a lot of fuel (Figure 5).
Use two new copper sealing rings, one on each side of the banjo
fitting, when replacing the fuel outlet line. Reattach
the wiring, making sure that the positive and negative wires are correct. Tighten the fuel inlet line, and replace the
sponge piece next to the fuel pump, which is a sound deadener. Replace the splash pan, and you are done.