Mercedes Mullins
Replacing a feed line in an underground fuel tank can be a complex task, with many factors to consider. One option is to use AN fittings and a braided stainless line, although this can be tricky to assemble. Another option is to use PTFE line, which is more expensive but offers a better fit and is more durable. It's important to secure the line early and often to avoid any leaks, and to use the correct tools such as a flare nut and a 37-degree flare tool when adapting to AN.
| Characteristics | Values |
|---|---|
| Fittings | AN fittings, compression fittings, flare nut, 37-degree flare tool |
| Line type | Braided line, braided stainless lines, PTFE line, braided rubber racing hoses, Aeroquip PTFE hose |
| Line length | Under 15 inches for flexible fuel line |
| Tools | Vice jaws, aluminium assembly jaws, canvas or leather rag |
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What You'll Learn
Using AN fittings to hook to the hard line in the tank
To replace the feed line in an underground fuel tank, you can use AN fittings to hook to the hard line in the tank. This involves using a 90-degree bend at the top, which goes through the plate that bolts the pump bracket to the tank. You can then run a braided line along the route of the current hard line and use an adapter fitting to tie it into the hard line feeding the fuel filter.
When adapting to AN, you will need a flare nut and a 37-degree flare tool. It is recommended to keep the flexible fuel line under 15 inches in any car. Make sure you secure the line early and often to avoid any leaks. You can use PTFE line or stainless hardline with compression fittings.
The braided rubber racing hoses do not have an inner liner, so they may weep fuel vapour and cause a faint fuel smell. If you can afford it, use Aeroquip PTFE hose and fittings, which are almost the same OD as a hard line and are indestructible.
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Running a braided line the length of the car
To replace a feed line in an underground fuel tank, you'll need to use AN fittings to hook to the hard line in the tank. This should be connected to the pump with a 90-degree bend at the top. You can then run a braided line the length of the car, following the route of the hard line.
To do this, you'll need to secure the line early and often. One user recommends using PTFE line. They also advise using compression fittings to adapt to short lengths of braided line at the beginning and end of the hard line. Another user suggests keeping flexible fuel lines under 15 inches in any car. To adapt to AN, you'll need a flare nut and a 37-degree flare tool.
Braided rubber racing hoses do not have an inner liner, so they weep fuel vapour. This means your car will always have a faint fuel smell, even with no leaks. They are also difficult to assemble. If you can afford it, use Aeroquip PTFE hose and fittings. These are almost the same OD as a hard line and are indestructible.
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Using a flare nut and a 37-degree flare tool to adapt to AN
To replace a feed line in an underground fuel tank, you can use AN fittings and a braided stainless line. To adapt to AN, you will need a flare nut and a 37-degree flare tool.
First, cut off the offending section of the hard line as close as possible. Then, use the 37-degree flare tool to flare the end of the hard line. This will allow you to adapt it to AN. Make sure you buy a set of vice jaws to hold the fittings, as PTFE fittings are impossible to tighten without them. You can get funky aluminium assembly jaws that go in a vice, or you can use a canvas or leather rag in the vice.
After adapting the hard line to AN, run a short section of braided flex line. Keep the flexible fuel line under 15 inches in any car. Secure the line early and often to avoid it rubbing through. You can use PTFE line, or if you can afford it, Aeroquip PTFE hose and fittings. These are almost the same OD as a hard line and are indestructible.
Finally, use another adapter fitting to tie the braided line into the hardline feeding the fuel filter. This will complete the replacement of the feed line in your underground fuel tank.
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Using PTFE line and securing it early and often
Replacing a feed line in an underground fuel tank can be a complex process, but using PTFE line can make it more manageable. PTFE, or polytetrafluoroethylene, is a synthetic fluoropolymer known for its exceptional chemical resistance and durability. When replacing the feed line in an underground fuel tank, it is essential to secure the line early and often to prevent any potential leaks.
To begin the replacement process, you will need to access the underground fuel tank and locate the feed line that needs to be replaced. Make sure you have the necessary tools and materials, including the PTFE line, fittings, and any required adapters. It is recommended to use Aeroquip PTFE hose and fittings, which are known for their durability and similar outer diameter to a hard line.
Once you have accessed the feed line, cut off the damaged or rusted section as close as possible to the tank. This will provide a clean surface to work with and ensure a secure connection for the new PTFE line. After cutting the line, flare the end of the hard line using a 37-degree flare tool to adapt it to AN fittings. You may need a friendly local with a flare tool to assist with this step.
Now, it's time to install the PTFE line. Secure the line early and often to prevent any potential leaks. Use compression fittings to adapt to short lengths of braided line at the beginning and end of the hard line. This will provide a secure connection and help prevent leaks. Make sure to follow the same route as the previous feed line, running the PTFE line along the length of the car. Use AN fittings to connect the PTFE line to the hard line in the tank, ensuring a tight and secure connection.
Finally, test the new feed line for any leaks. Turn on the fuel pump and carefully inspect all connections for any signs of leakage. If done correctly, using PTFE line and securing it early and often will result in a durable and leak-free fuel feed line replacement. Remember to always take the necessary safety precautions when working with fuel systems and underground tanks.
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Using Aeroquip PTFE hose and fittings
To replace a feed line in an underground fuel tank, you can use Aeroquip PTFE hose and fittings. These are almost the same OD as a hard line and are indestructible. Make sure you secure the line early and often.
To adapt to AN, you'll need a flare nut and the proper 37-degree flare tool. You can cut off the offending section of the hard line as close as is practical and flare the end of the hard line, adapting to AN, and then run a short section of braided flex line. You can also use a friendly local with a flare tool to help you.
You can use AN fittings to hook to the hard line in the tank (connected to the pump) with a 90-degree bend at the top. This would go through the plate that bolts the pump bracket to the tank. Then, run the braided line the length of the car along the route the hard line currently flows and then use another adapter fitting to tie it into the hard line feeding the fuel filter.
The braided rubber racing hoses do not have an inner liner so they weep fuel vapour. Your car will always have a faint fuel smell with no leaks. They are also a bit of a pain to assemble, particularly if you don't want to scratch them up.
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Frequently asked questions
One option is to use AN fittings and a braided stainless line. You will need a flare nut and a 37-degree flare tool to adapt to AN. You can also use PTFE line, but make sure you secure the line early and often.
AN fittings and braided stainless lines are a good option because they are flexible and can be adapted to short lengths of braided flex line. They are also indestructible and have almost the same OD as a hard line.
Braided rubber racing hoses do not have an inner liner, so they weep fuel vapour. This means your car will always have a faint fuel smell, even if there are no leaks. They are also difficult to assemble and can be scratched easily.
