
Grease is used for fuel line fittings to prevent the need to cut hoses or break fittings when trying to bust loose later. Petroleum-based greases may deteriorate the rubber, so it is important to use the right grease. Some people use white grease, dielectric grease, Vaseline, MMO, or ATF.
| Characteristics | Values |
|---|---|
| Type of grease | White grease, dielectric grease, Vaseline, MMO, ATF, caliper bolt anti-seize grease |
| Purpose | To prevent cutting or breaking of fittings |
| Application | Applied to the fitting, not the hose |
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What You'll Learn

White grease is used for hose-fittings that will be taken apart again
Some people use dielectric grease on the O-rings to make it easier to install injectors into the fuel rail without cutting the O-rings. Others use Vaseline, MMO, or ATF to lube the fitting (not the hose). However, some greases may deteriorate the rubber, so it's important to be careful when choosing a grease.
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Vaseline can be used to lube the fitting
Petroleum-based products can be used to lube fuel line fittings, and Vaseline is a petroleum-based product. However, Vaseline is not intended for internal use and may not be suitable for this purpose. It can be used to lube the fitting, but it may dry out faster and need reapplying. It is also important to note that Vaseline does not easily wash off with water, and its residue may lead to skin irritation over time.
Vaseline is commonly used for external application on dry skin areas, and water-based lubricants are often chosen for internal use. Silicone-based lubricants provide long-lasting moisture but may not be compatible with all materials. Selection of a product depends on the specific situation, considering the various properties and intended use of each lubricant option.
Some people use white grease for hose-fittings that they will be taking apart again. This prevents them from having to cut hoses later, or break a fitting when trying to bust it loose. However, for lines going into the tank, it is not recommended to use grease as it could potentially pull off easier. Spit is fine as it will dry, and sometimes nearly glues the hose back on.
Other options for lubricating fuel line fittings include dielectric grease, clean motor oil, and oily fuel injector cleaner.
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Petroleum-based products can deteriorate rubber
However, this is not always the case. Some fuel hoses are not susceptible to attack by petroleum-based products. In fact, petroleum jelly is recommended as a lubricant for fuel hose fittings.
It is important to note that different types of rubber have varying levels of resistance to petroleum-based products. For example, Buna-N and EPDM can be impacted by petroleum products, whereas nitrile rubbers are better suited for exposure. Rubber compounding is a branch of study that deals with the formulation of additives in rubber to enhance its properties for specific applications.
When it comes to fuel line fittings, some people recommend using white grease for hose fittings that will be taken apart again. This prevents the need to cut hoses or break fittings when trying to bust them loose. However, for lines going into the tank, it is best not to use grease as it can make the hose slip off too easily. Instead, spit can be used as it will dry and act as a glue for the hose.
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Spit can be used to glue the hose back on
Although some people use white grease for fuel line fittings, spit is also fine as it will dry and sometimes nearly glues the hose back on.
One user recommends using a little white grease for most hose-fittings that will be taken apart again. This prevents the need to cut hoses or break a fitting when trying to bust loose later. However, for lines going into the tank, spit is a better option as it will dry and nearly glue the hose back on. Grease will make the hose slip on easily, but it could potentially pull off more easily.
Other greases that can be used include dielectric grease, Vaseline, MMO, ATF, and caliper bolt anti-seize grease. However, some greases may deteriorate the rubber, especially petroleum-based products.
If the hose is already cut, one option is to use a butane lighter to soften the ends, twist them together, and then use a glue like Gorilla Glue to stick them back together. This process can take up to two weeks to find and seal all the leaks.
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Dielectric grease is used on o-rings
When it comes to fuel line fittings, there are a variety of greases that can be used. One user recommends using a little white grease for hose-fittings that they will be taking apart again, as it prevents them from having to cut hoses or break a fitting. Another user recommends using dielectric grease on the o-rings, as it makes it easier to install the injectors into the fuel rail without cutting the o-rings. It is also suggested to use clean motor oil to lubricate the o-rings, as if any of the grease accidentally gets into the fuel stream, it will be dissolved quickly and pass through without causing any problems. Silicone-based products won't do this.
Vaseline, MMO, or ATF can also be used to lube the fitting (not the hose). However, some greases may deteriorate the rubber, so it is important to be careful when choosing a grease for fuel line fittings.
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Frequently asked questions
White grease is often used for hose-fittings that will be taken apart again. It prevents the need to cut hoses or break a fitting when trying to bust loose later.
Some people use whatever grease is within quick reach, such as caliper bolt anti-seize grease, Vaseline, MMO, or ATF.
Spit is fine as it will dry and nearly glue the hose back on.
Dielectric grease can be used on the o-rings to make it easier to install the injectors into the fuel rail without cutting the o-rings.
Petroleum-based products should not be used as they may deteriorate the rubber.










































