Is Diesel Fuel Line The Same As Gas?

Fuel line is a petroleum-resistant nitrile tube with a weather-resistant, ozone-resistant, and heat-resistant covering that can be utilised for ethanol-laced fuels as well as diesel fuel. It should not, however, be utilised on systems that produce pressures more than 50 psi, such as coolant systems, oil systems, or fuel-injection systems.

A diesel fuel tank is equipped with which fuel lines?

Diesel fuel lines are divided into three categories. Heavyweight lines are used when there are high pressures between the injection pump and the injectors, medium weight lines are used when there are light or medium fuel pressures between the fuel tank and the injection pump, and lightweight lines are used when there is little or no pressure.

Which material is better for diesel fuel lines?

The fact that gasoline and diesel control samples in our ageing and corrosion investigations never really age is something we’ve noticed at PS for a long time. Gum and discoloration are only produced when metal samples are included in the samples. Refinery stability treatments are one cause, but the fundamental difference is that copper and zinc ions are powerful polymerisation catalysts. Because copper tubing, brass fittings, and galvanised piping are prohibited by code, this type of failure does not occur in shore-side fuel storage systems. The following requirements have been cited by standards organisations and OEMs.

ASTM D975 Appendix X2.7.2

Copper and copper-based alloys should be avoided at all costs. Copper can cause mercaptide gels and increase fuel deterioration. Zinc coatings can create gels when exposed to water or organic acids, clogging filters quickly.

British Petroleum

Copper and zinc exposure, ahead of water and soil, are the most detrimental variables in long-term storage, according to British Petroleum. BP claims that:

The following circumstances can hasten the ageing process:

  • There is water present. Fungus and bacteria thrive in water, producing natural by-products such as organic acids, which make the fuel unstable.
  • High-temperature exposure.
  • Dust and grime can contain trace elements like copper and zinc, which can destabilise the fuel.
  • Composition of the fuel. Some components of diesel fuel naturally deteriorate over time.

We looked into diesel standby generator installation requirements. The gasoline will sit there for months, just like boats that are stored seasonally. We discovered that copper tubing and brass fittings were universally condemned:


Diesel fuel lines are best served by black iron pipe. Valve and fittings made of steel or cast iron are chosen.

CAUTION: Copper and zinc should not be utilised with diesel fuels, either as plating or as a substantial alloying component. In the presence of sulphur, zinc becomes unstable, especially if moisture is present in the fuel. Chemical action produces a sludge that is particularly detrimental to the engine’s interior components.


Piping for diesel fuel. Black iron pipe should be used to make diesel fuel lines. Because cast iron and aluminium pipe and fittings are porous and can leak gasoline, they should not be utilised. Galvanized gasoline lines, fittings, and tanks must not be utilised because the galvanised coating will be attacked by the sulfuric acid formed when the sulphur in the fuel reacts with the condensate in the tank, resulting in debris that can clog fuel pumps and filters.

Copper lines should not be used because fuel polymerizes (thickens) in copper tubing after extended periods of inactivity, clogging fuel injectors. Copper lines are also less durable than black iron, making them more vulnerable to damage.

Use galvanised or copper gasoline lines, fittings, or tanks at all times. Sulfuric acid is formed when condensation in the tank and lines reacts with the sulphur in the diesel fuel. The copper or galvanised pipes or tanks’ molecular structure reacts with the acid, contaminating the fuel.

US Army CERDEC study, 1977

In the past, major field concerns have resulted from galvanised storage tanks, pipelines, and terne-coated vehicle tanks. Zinc has a tendency to build up in spray holes, causing nozzle coking. Fuel acids attack lead (a component of terne plating) and cause soap precipitates. Copper has the potential to catalyse the oxidation of fuels and induce solids deposition. Nonferrous metals and alloys should be avoided in fuel pipes and storage tanks, as well as throughout the complete vehicle fuel system.

When exposed to biodiesel or bugs, ni-terne, which is used to cover the inside of the tank, can peel.

US Department of energy

Certain metals may have an effect on biodiesel by speeding up the oxidation process and resulting in the formation of fuel insolubles. In both B100 and B20, lead, tin, brass, bronze, and zinc considerably increase sediment formation. At any blend level, galvanised metal and terne-coated sheet metal are incompatible with biodiesel.


Should we replace copper and brass with flexible hose, steel, and aluminium in the fuel system? Let’s not rush into things. Metal deactivators in PS suggested additions sequester the problematic ions, rendering them harmless. You are safe if you follow a regular therapy schedule. However, while installing new equipment, think about the materials you use.

Do you require specific diesel fuel lines?

Use a fuel line labelled “diesel” if you’re using diesel. Make sure the hose can handle alcohol blended fuels if you’re using a high-ethanol fuel.

Why are there fuel return lines on diesel engines?

The underlying purpose for the fuel return line is because the extra gasoline removes heat from the injector, allowing it to last longer. Keep in mind that the injector is in direct contact with the cylinder head and combustion chamber, which are both quite hot.

I’m not sure what kind of fuel line to use.

Fuel lines are built of a variety of materials, each with its own set of advantages and disadvantages. The majority of fuel lines are reinforced rubber. Fuel lines should be made of this material since it prevents kinking and cracking. Make sure you choose a fuel line that can handle both vapour and liquid fuel. Stainless steel, plastic, steel coated with zinc, and nylon are some of the other materials used in gasoline lines. It is critical to read several reviews and learn how a specific fuel line performed for other users before making a purchase.

Q. What Is The Best Material For Fuel Lines?

The ideal gasoline line material is determined by your requirements. Polytetrafluoroethylene, or PTFE, is the ideal material for gasoline lines. Teflon is a type of plastic that is used to make PTFE fuel lines. This gasoline line material is resilient to degenerative fuel effects that might cause vapour barriers to form. It does, however, have drawbacks, just like everything else. Because it is inelastic, it is prone to kinking. However, if you use a proper bending tool while producing bends and curves, you can avoid this.

Q. Can I Replace Metal Fuel Lines With Rubber?

If your metal gasoline lines have rusted and begun to leak, you should repair them immediately to minimise further damage. Yes, rubber fuel lines can be used in place of metal gasoline lines. Some individuals prefer to repair only the rusty portion of the gasoline line, however it is more prudent to replace the entire fuel line. Rubber components in fuel lines are strengthened and can withstand high pressure from current injection systems. Rubber gasoline lines are also quite sturdy and will last a long time.

Q. Can Fuel Line Be Submerged In Fuel?

The sort of fuel line you wish to submerge in petrol will determine how long it takes. Fuel lines can be submersible or non-submersible. Even when buried in fuel, submersible fuel lines can survive. Non-submersible gasoline lines, on the other hand, are only meant to be used from the inside. As a result, depending on how and where you intend to use the fuel line, always check whether it is submersible or non-submersible before purchasing it.

Q. Can Vinyl Tubing Be Used For Fuel Line?

Vinyl tubing isn’t the ideal fuel line material unless it’s specifically designed for it. Gasoline, ethanol, and other hydrocarbons should not be transported in plain vinyl tubing. After some time, this tubing turns yellow. After conveying fuel, vinyl tubing becomes rigid and brittle. Only use Vinyl Tubing for fuel lines that are specifically designed for the job.

Q. Can Copper Be Used For Fuel Lines?

Another fuel line material available on the market is copper. It is one of the most appealing materials for fuel lines. It establishes a long-term gasoline or oil line and connection. As a result, copper fuel lines are acceptable. However, because new copper gasoline lines are easier to instal than old tubing, it is recommended to utilise them instead of old tubing. If you’re working with old copper tubing, heat it to soften it and make it easier to bend. Some copper gasoline lines can be bent nicely with time and patience, but you’ll require bending equipment in your mechanic toolbox if this isn’t the case.

Q. Can You Replace Steel Fuel Lines With Nylon?

Yes, nylon fuel lines can be used in place of steel gasoline lines. Many people prefer nylon gasoline lines because they are more cost-effective. They’re also quite adaptable and simple to set up. Even without bending tools, some nylon fuel line materials may generate elegant bends and curves. These fuel lines are available in various lengths and can be used to replace a single segment or the full fuel line.

What are the dimensions of gasoline lines?

Metric, JIC / AN, NPTF, and occasionally BSP threads are common in fuel systems. Take a closer look at what distinguishes these discussions.


AN6 / Dash 6 / -6, which amounts to a thread measuring 9/16 x 18 (threads per inch) with a hose bore of around 3/8, and AN8 / Dash 8 / -8, which has a thread measuring 3/4x 16 (threads per inch) with a hose bore of around 1/2, are the most common sizes used in gasoline systems.

Male threads have a convex tapered seat, while female threads have a concave tapered seat.

The AN stands for Army/Navy, as these fittings debuted on US aircraft during World War II. These types of fittings wound up on race vehicles when surplus became available.


National Pipe Thread Fuel (NPTF) is a type of fuel that is commonly found on carburettor fuel pumps and some fuel pressure regulators. The female and male threads are tapered, which means they tighten against one other to form a seal.

1/8, 1/4, 3/8, and 1/2 are the most common diameters for fuel systems. The 1/8 is around 10mm, the 1/4 is about 13mm, the 3/8 is about 17mm, and the 1/2 is about 21mm.


This thread is rarely found on fuel fittings, however it is occasionally found on fuel taps and pressure gauge adapters.

The most common sizes are 1/4, 3/8, and 1/2BSP, where the sizing refers to the hose size. The 1/4 thread is approximately 13mm in diameter, the 3/8 thread is approximately 15mm in diameter, and the 1/2 thread is approximately 19mm in diameter.

The male thread has a concave tapering seat, while the female thread has a convex seating.

What sort of diesel hose can you use?

A diesel fuel hose has a variety of uses in the maritime and fuel extraction industries. Diesel fuel hoses are rated for certain applications using a combination of a number and a letter to maintain safety and quality standards.

The US Coast Guard (USCG) has classified diesel fuel pipes into four categories: A1, A2, B1, and B2. All marine applications must use Type B hose at the gasoline pump and carburettor components of the fuel line system, according to USCG regulations. A leak in one of these areas could result in a significant loss of fuel. The Type B diesel hose is also fire resistant, reducing the chance of a fire. The Type 1 hose is also recommended by the USCG for essential applications because to its minimal permeability. All fuel hoses used for marine purposes must have the USCG mark every 12 inches, along with the manufacturing date, according to Coast Guard regulations.

For diesel-powered applications, the American Boat & Yacht Council (ABYC) recommends the Type B1 fuel hose. For gasoline supply, the Type A1 hose is the optimum solution. This hose is less permeable, more durable, and heat resistant, as well as not collapsing under high pressure or vacuum.

Fuel hoses are subjected to a great deal of wear and tear from petroleum compounds. To achieve long-term results, it is critical to choose high-quality hoses. Every quarter, though, one should inspect fuel hoses for fractures, rust, or sponginess. Fuel hoses should be cleaned clean with a dry rag and examined for fuel odour, according to USCG guidelines.

When purchasing a diesel fuel hose, keep the following fundamental things in mind:

  • For in-tank applications, purchase submersible fuel hoses.
  • Look for industry standards like ABYC, SAE, and the US Coast Guard.
  • Fuel hose fittings made of stainless steel or PVC should be avoided.

Is it possible to use vinyl tubing for diesel fuel?

Thanks. I would never use vinyl tubing to transport any form of fuel. There is transparent plastic tubing for fuel that is used on motorbikes and some foreign cars, but it is not the same as the stuff you buy in bulk at the hardware store.

Will a hydraulic hose work with a diesel engine?

Hose for gasoline service is made of diverse materials to prevent degradation, which can lead to softening, hardness, cracking, and other problems. The additives in diesel fuel would damage the hydraulic-service rubber hose, despite the fact that it is a light oil. Please specify the make, model, and year of your car in your signature line.