Ameer Randolph
If you're wondering whether to use pipe thread sealant on your fuel line, it's important to know that the threads themselves are the sealing surface. PTFE tape is the proper sealant for metal pipe threads on fuel lines, but it's critical to wrap it in the correct direction and not to overdo it. For most components, such as a pre-fuel filter, the thread type is typically NPT or NPTF, which requires sealant around the threads. To choose the appropriate thread sealant, look for its chemical resistance to fuel (diesel or gasoline) or oil running through the line.
| Characteristics | Values |
|---|---|
| Should I use pipe thread sealant on my fuel line? | Yes, but only if you have the correct thread type. |
| What type of thread sealant should I use? | PTFE tape, pipe dope, Permatex #2, Loctite, Gasoila, or teflon tape. |
| How much sealant should I use? | Don't overdo it; twice around is plenty. |
| What direction should I wrap the sealant in? | The correct direction depends on the type of thread. |
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What You'll Learn
What type of thread sealant is okay to use on fuel lines?
It is important to know the thread type in the component you are purchasing and then mate it with the matching thread type. NPT is a tapered thread common to plumbing connections in North America, and is also the most common thread type in fuel line components. NPT leaves a minute gap at the very point of the male thread tip and female valley. Another thread type sometimes used is UNF, which is straight and requires the matching UNF thread to mate with. Both of these thread types are designed to work with a sealant.
To choose the appropriate thread sealant, look for its chemical resistance to fuel (diesel or gasoline) or oil running through the line. Ordinary pipe dope is fine, as are several "Loctite" products. PTFE tape (any colour) can certainly be used, requiring only that it be applied correctly. Backyard mechanics will tell you they've used regular old gas-resistant Teflon tape (yellow stuff) with success.
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What is the correct way to apply thread sealant?
When applying thread sealant to a fuel line, it is important to first identify the thread type. The most common thread type in fuel line components is NPT, which is a tapered thread common to plumbing connections in North America. Other thread types include UNF, which is a straight thread. Both of these thread types are designed to work with a sealant.
To choose the appropriate thread sealant, look for one that is chemically resistant to the type of fuel (diesel or gasoline) or oil running through the line. Ordinary pipe dope is fine, and there are many brands available, including Permatex #2 and several "Loctite" products. PTFE tape (any colour) can also be used, but it is important to wrap it in the correct direction and not to overdo it – twice around is plenty. When using PTFE tape, make sure to wrap it in the direction that the threads will be tightened, so that it does not unravel when the fitting is tightened.
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What thread type is typically used for fuel lines?
It is important to know the thread type of the component you are purchasing and then mate it with the matching thread type. For most components, such as a pre-fuel filter, the thread type is typically NPT or NPTF and requires sealant around the threads. NPT is a tapered thread common to plumbing connections in North America and is also the most common thread type in fuel line components. NPTF stands for National Pipe Thread Fuel and is typically used on carburettor fuel pumps and some fuel pressure regulators. The thread is tapered, meaning that the female and male thread tighten against each other to form a seal.
Another thread type sometimes used is UNF, such as on the Racor Turbine Fuel Filter series. This thread form is straight and requires the matching UNF thread to mate with. Both of these thread types are designed to work with a sealant. To choose the appropriate thread sealant, look for its chemical resistance to fuel (diesel or gasoline) or oil running through the line.
PTFE tape is the proper sealant for metal pipe threads on fuel lines. Ordinary pipe dope is also fine, and there are many brands available.
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What thread types are designed to work with a sealant?
Thread sealants are used to fill the space between male and female threaded connections, preventing leaks. The two main types of thread sealants are liquid and tape.
Liquid sealants are not solvent-based and take time to cure. They do not crack or shrink, creating a tight air and water-proof seal. Most liquid thread sealants are PTFE-based, which aids the sealing process. Liquid sealants are the most cost-effective option and can be used with a wide range of materials. They are also resistant to high temperatures, high pressure, vibration, and chemicals.
PTFE tape, also known as Teflon tape or plumber's tape, is mostly used as a plumbing thread sealant for water pipes and fittings. It is suitable for small or temporary applications but is not the best option for professional plumbing systems that require a permanent, high-strength seal.
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What is the best sealant for metal pipe threads on fuel lines?
It is important to know the thread type in the component you are purchasing and then mate it with the matching thread type. NPT is a tapered thread common to plumbing connections in North America, and is also the most common thread type in fuel line components. NPT leaves a minute gap at the very point of the male thread tip and female valley. Both NPT and UNF thread types are designed to work with a sealant.
PTFE tape is the proper sealant for metal pipe threads on fuel lines. It is important to wrap it in the correct direction and not to overdo it; twice around is plenty. Ordinary pipe dope is also fine, as are several "Loctite" products.
Backyard mechanics have used regular old gas-resistant Teflon tape (yellow stuff) with success. Petroleum has no effect on Teflon.
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Frequently asked questions
Yes, pipe thread sealant is required for most fuel line components.
There are many suitable choices, including ordinary pipe dope, Permatex #2, some other Permatex forms, several "Loctite" products, and PTFE tape (any colour).
Wrap the PTFE tape around the threads twice in the correct direction.
The thread type is typically NPT or NPTF and requires sealant around the threads. NPT is a tapered thread common to plumbing connections in North America and is the most common thread type in fuel line components.
