Regan Brown
Replacing the fuel lines in a Porsche 911 SC is a complex task that requires careful planning and execution. The process involves draining the fuel tank, disconnecting the old fuel lines, and installing new replacement lines. This can be done by pushing in the old line grommets and using a double-ended threaded coupler to connect the new line to the old one. The disconnected old line can then be pulled out from the front of the car while a helper feeds the new line in from the back. It is important to note that the high-pressure lines on the front and in the engine bay are either machine-crimped or use screw collars, and hose clamps may not be reliable in the long term. Additionally, accessing the back of the grommet and wiping off the lube from both sides are crucial steps to ensure a proper replacement.
| Characteristics | Values |
|---|---|
| Fuel line material | Plastic |
| Fuel line path | From the tank to the engine, through the transmission linkage tunnel |
| Replacement method | Pushing in the old line grommets and using a double-ended threaded coupler to connect the new replacement line to the old one |
| Old line removal | Pulling out the disconnected old line from the front of the car while a helper gently pushes and feeds the new line in from the back |
| Grommet installation | Dunking the grommet in engine oil and working it in with a flat head screwdriver |
| Lube removal | Wiping the lube off the grommets from both sides |
| Pump lines | Buttoning up the short front tank and pump lines |
| Pump line types | Pump feed line, tank return line, and a short rubber feed line between the tank and pump |
| Tank drainage | Removing the fuel sender at the top of the tank to drain the tank of fuel |
| Fuel sender removal | Popping off the sender electrical plug and nuts, pulling out the sender, and testing it |
| Entire line replacement | Dropping the engine/tranny, which is a $585 job |
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What You'll Learn
Removing the old fuel line
Next, you will need to disconnect the old fuel line. This can be done by pushing in the old line grommets and using a double-ended threaded coupler to connect the new replacement line to the old one. With a helper, you can then pull the disconnected old line out the front of the car while simultaneously feeding the new line in from the back.
It is important to note that the fuel lines on the high-pressure side (up front and in the engine bay) are either machine-crimped or use screw collars. Hose clamps may not be reliable for these connections. Additionally, the coupling nuts may be hidden by the engine frame, requiring the engine to be dropped for access.
Before beginning any work, it is essential to refer to the specific model and year of your Porsche 911 SC, as well as seeking guidance from a qualified mechanic if you are unsure about any steps.
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Connecting the new fuel line
Next, you will need to connect the new replacement line to the old one. You can do this by using a double-ended threaded coupler. Push in the old line grommets, then pull the disconnected old line out the front of the car while someone else pushes and feeds the new line in from the back.
The new line fittings and coupler may get hung up in the tunnel, so be prepared for this. Once the new line is in place, you can button up the short front tank and pump lines. There is a pump feed line, a tank return line, and a short rubber feed line between the tank and pump.
It is worth noting that the high-pressure lines on the front and in the engine bay are either machine crimped or use screw collars. Hose clamps may not be reliable in the long term.
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$42.99
Draining the tank
The next step is to replace the fuel line. The fuel line runs from the tank to the engine, through the transmission linkage tunnel. The lines on the high-pressure side (up front and in the engine bay) are either machine-crimped or use screw collars. Hose clamps may not be reliable over the long term.
To replace the line, you can attach a nylon cord to one end of the old line, then pull it out. Tie the cord to the new line and pull it back in. Alternatively, you can use a double-ended threaded coupler to connect the new replacement line to the old one, then pull the old line out the front of the car while someone pushes and feeds the new line in from the back.
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Replacing the fuel pump
Firstly, you will need to drain the fuel tank to minimise spillage and reduce the risk of fire. To do this, access the fuel sender at the top of the tank and remove the electrical plug and nuts before carefully pulling out the sender.
Next, you will need to disconnect the old fuel lines. This can be done by pushing in the old line grommets and using a double-ended threaded coupler to connect the new replacement line to the old one. With a helper, carefully pull out the old line from the front of the car while your assistant pushes and feeds the new line in from the back.
Now, it's time to install the new fuel pump. Make sure you have the correct replacement pump that is compatible with your Porsche 911 SC. Follow the manufacturer's instructions for the specific steps involved in installing the new fuel pump, as they may vary depending on the model and year of your vehicle.
Finally, reconnect the new fuel lines and secure them with hose clamps or screw collars. Ensure that all connections are tight and secure to prevent leaks. Test the new fuel pump and lines by filling the tank and checking for any signs of leaks or issues.
It is important to note that replacing the fuel pump and lines on a Porsche 911 SC can be a challenging task, and it may be beneficial to seek the assistance of a qualified mechanic or Porsche specialist if you are unsure about any part of the process.
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Replacing the check valve
To replace the check valve, you will need to access the back of the grommet (behind the pedals). Dunk the grommet in engine oil and use a flat-head screwdriver to slowly work it in. Once you have access to the back of the grommet, you can replace the check valve.
The check valve is part of the fuel pump system, which includes a pump feed line, a tank return line, and a short rubber feed line between the tank and pump. If your fuel pump has low miles on it, you may only need to replace the check valve to prevent it from sticking due to inactivity.
When replacing the fuel lines, you will need to consider the high-pressure side lines, which are either machine-crimped or use screw collars. Hose clamps may not be reliable over the long term. To replace the entire line, the engine and transmission must be dropped, as the coupling nuts are hidden by the engine frame. This can be a costly job.
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Frequently asked questions
To minimise splillage and fire risk, go in through the fuel sender at the top of the tank. Pop off the sender electrical plug and the nuts, and start to pull the sender out.
Push in the old line grommets and use a double-ended threaded coupler to connect the new replacement line to the old one. Pull the disconnected old line out the front of the car while a helper gently pushes and feeds the new line in from the back.
You will need a flat head screwdriver, engine oil, and a double-ended threaded coupler.
The lines on the high-pressure side are either machine crimped or use screw collars. Hose clamps may not be reliable over the long term.
