Porsche 911 (1965-89) Fuel Pump Replacement

Some common fuel injection problems can be traced back to a faulty or non-operational fuel pump. If your pump is noisy and loud, or the fuel pressure in the engine compartment is below what is needed for proper fuel injection operation, then it's probably time to replace it.

The 911 fuel pump is a not as simple a device as one might think. The fuel actually runs through the pump and acts as a coolant and lubricant for the entire assembly. Therefore, if you let your car run out of gas, make sure that you turn off the pump immediately, or you might damage the internal components of the pump. Not much is worse than a broken or faulty pump leaving you stranded on the side of the road.

Typical fuel pump problems can sometimes be headed off in advance. If the pump is noisy, and making loud clicking noises, then chances are that the bearings inside are worn and should be replaced. If the pump continues to make noise even after the ignition is shut off, internal check-valves in the pump may be showing signs of failure. The pump could seize up at some time, or the pressure to the fuel injection system could drop. Either way, the car will not be performing at its peak. Another symptom of failure is the pump getting stuck, and then finally kicking in after turning the ignition on and off a couple of times. This could be a clear sign that you are living on borrowed time, and that you should replace the pump immediately. Check the electrical connections to the pump before you replace it to make sure that it's not an electrical problem.

Before removing and replacing the fuel pump, try to get as much fuel out of the tank as possible. Be careful to turn the ignition off immediately if you let the car run dry, as this can burn out your fuel pump. Of course, if you are replacing it anyway, it doesn't really matter. Drive the car around until the fuel light goes on. The lower the fuel in the tank, the lower the pressure will be on the hose, and you will have a greater chance of blocking the fuel intake hose before you disconnect it. Make sure that you also perform the replacement procedure in a well-ventilated area that is free from any sources of ignition (gas/water heater, electrical cord, or lamp). If you need some more light, use a cool fluorescent lamp and keep it far away from the pump. Fuel will spill out when you replace the pump and you don't want it getting anywhere near the lamp. Disconnect the battery ground as well. Also make sure that you wear gloves, as gasoline and its components are known carcinogens that can easily be absorbed through the skin. Before you start working on the pump, disconnect the battery ground. You would hate to have the pump accidentally turn on when you are working on it. It's also a wise idea to have a fire extinguisher handy.

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Time: 3 hr
Tab: $250
Tools: Socket set:https://www.pelicanparts.com/Porsche/...
Applicable Models:
Porsche 911 (1965-89)
Porsche 930 Turbo (1976-89)
Parts Required: Fuel pump:https://www.pelicanparts.com/cgi-bin/... and new fuel lines:https://www.pelicanparts.com/cgi-bin/...
Hot Tip: Try to empty as much of the tank out as possible before you begin
Performance Gain: Better running fuel injection, quieter pump
Complementary Modification: Replace fuel lines