How to Install a Fuel Pump in a Porsche 944

by William Zane

The fuel pump on a Porsche 944 is that all-important device that ensures a constant and reliable supply of fuel is delivered to the engine. Over time, fuel pumps are subjected to heat and vibration, and dirt particles may get past the fuel filter. Eventually, the fuel pump will stop functioning altogether, at which point the car can't be driven. Luckily, replacing the fuel pump on a 944 is a relatively easy task, as long as you have a little time and the right tools.

Step 1

Disconnect the cable that goes to the negative terminal on the battery. Loosen the lug nuts on the rear, passenger-side wheel. Lift the rear passenger side of the 944 with a floor jack. Lower it securely onto a jack stand. Finish removing the lug nuts and the wheel.

Step 2

Locate the fuel pump. This is a small cylindrical device with fuel lines and electrical connections coming off it. Loosen the nuts holding the wires to the fuel pump with a wrench. Note which terminal each wire goes on.

Step 3

Place a pair of vice grips on the fuel line that comes from the tank and goes into the fuel pump. Place another pair on the line that goes from the pump to the engine. The line just has to be squeezed enough to prevent the fuel from coming out when you remove the fuel pump. Use a rag between the vice grips and the fuel line to prevent damage. Place a tray under the fuel line to catch any fuel that does spill.

Step 4

Loosen the hose clamp that holds the fuel line to the fuel pump. Pull fuel lines off either end of the fuel pump. You may need to push on the lines with a screwdriver to free them if they are stuck to the pump.

Step 5

Loosen the bolt on the bracket that holds the fuel pump to the chassis with a wrench or a socket and ratchet. Remove the fuel pump from the bracket.

Step 6

Install the new fuel pump into the bracket. Tighten the bolt that holds the bracket in place on the car. Install the wires on the proper terminals and tighten the nuts. Slide the fuel lines back onto the fuel pump at either end. Tighten the hose clamps.

Step 7

Remove the vice grips from the fuel lines. Reinstall the wheel. Lower the car off the jack stands. Tighten the lug nuts by hand. Reconnect the cable to the negative battery terminal. Start the engine and check for fuel leaks.

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