Anything above that can overpower the needle and seat and flood the carburetor. Most stock applications came with 5/16-inch fuel line, but for many street vehicles and mild race applications 3/8-inch (AN 6) fuel line is a good upgrade. High performance applications and racers using alcohol will use 1/2-inch (AN 8) fuel line.
Full Answer
What size fuel line after the fuel pump?
The fuel line after the pump can be the next smaller size. When using E85, alcohol, methanol, etc. go up to the next bigger fuel line. Was this answer helpful?
What size fuel line do I need for my Honda engine?
Whether it be Honda, Mercury, Yamaha, Suzuki, Tohatsu, Nissan, or Johnson/Evinrude. Any engine that is above the 115 HP requires you to use a 3/8″ fuel line! The basic functionality of a combustion engine and the fuel demand for the horsepower is the same!
How big is a 6an fuel line?
Quick reference for AN to Inch line conversion: -6AN = 3/8" -8AN = 1/2" Lots of strange information out on the internet regarding fuel line sizing and it seems like most of the time people run way more diameter fuel line than they need. This is an interesting article that I came across that seems to be pretty relevant.
Will increasing the fuel line size to ½” help?
Will increasing the line size to ½” help? Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. The ½” line will result in a ½ pound drop versus the 3 pound drop for the 3/8” line at the stated flow of 83.3 gph (enough to support 1000 HP at a BSFC of .5).
Earl's Performance AT105008ERL - Earl's Performance Billet Fuel Logs
Fuel Log, Billet Aluminum, Black Anodized, Adjustable, -10 AN Inlet, Holley, Each
Fragola Performance Systems 930002-BL - Fragola Performance Systems Fuel Line Kits
Fuel Line, Braided Stainless Steel, Holley, -6 AN Inlet, Black Anodized Fittings, Kit
Fragola Performance Systems 920022-BL - Fragola Performance Systems Pro Stock Fuel Line Kits
Fuel Line, Pro Stock, Braided Stainless Steel, Holley, -6 AN Inlet, Black Fittings, Kit
Russell Performance 641090 - Russell Dual Fuel Inlet Kits
Fuel Line, Braided Stainless Steel, Aluminum, Holley, 4150, 3/8 in. NPT Inlet, 1/8 in. NPT Gauge Port, Kit
Quick Fuel 34-600SL-SVRQFT - Quick Fuel Carburetor Fuel Lines
Fuel Line, Stainless Steel, Slayer Series, Silver, -6 AN Inlet, 7/8 in.-20 Thread, Kit
Fragola Performance Systems 920002-BL - Fragola Performance Systems Fuel Line Kits
Fuel Line, Braided Stainless Steel, Holley, 4150, -6 AN Inlet, Black Anodized, Kit
The Benefits of Buying Carburetor Fuel Line Fittings
There are many benefits to buying fittings for fuel inlet lines. When properly matched, the result will be a leak-free seal for your vehicle's fuel system. It is important to understand fittings for fuel inlet lines and their functions to make this possible.
Customer Questions About Carburetor Fuel Line Fittings
Buying quality carburetor fuel line fittings can be overwhelming and confusing. There are many factors to consider when shopping for carburetor fuel line fittings including different brands, prices, sizes, finishes, fuel line connector types, and much more.
Can't Find The Timing Light You Are Looking For?
A JEGS expert is ready to answer your questions and help you find the carburetor fuel line fittings, connectors, hoses, or adapters that you require for your specific application.
What is the least amount of pressure loss in fuel lines?
Every fuel line experiences pressure loss depending on fuel line length, and fuel flow rate. It should be noted that fuel lines which feed pressure gauges experience the least amount of loss, as the flow rate through the gauge line plummets to near zero flow levels.
Why do carbureted and EFI systems operate differently?
What they did not know was that carbureted and EFI systems operate differently because of sensitivity to pressure drop. The topic of determining actual pressure drop and how it can affect different systems is typically not addressed or performed.
Do EFI fuel pumps have the same pressure loss as carburetor fuel pumps?
EFI fuel pumps don’t experience the same pressure loss issues as carburetor fuel pumps. Take a look at Graph C which describes an example of the performance of an EFI fuel pump versus a carbureted fuel pump. Graph C. Obviously, the fuel flow rate for the carbureted pump is much lower than that of the EFI pump when at higher pressure.
How to know what fuel line is on a combustion engine?
The basic functionality of a combustion engine and the fuel demand for the horsepower is the same! You will also know what fuel line is supposed to be there by looking at the hook up on the engine. Wherever you hook up the fuel line on the engine there will be a hose barb. If it is a 5/16″ or a 3/8″ hose barb, that is what you should use.
What fuel line do you need for a Honda engine?
The general rule of thumb still stands regardless of what manufacturer engine you have! Whether it be Honda, Mercury, Yamaha, Suzuki, Tohatsu, Nissan, or Johnson/Evinrude. Any engine that is above the 115 HP requires you to use a 3/8″ fuel line! The basic functionality of a combustion engine and the fuel demand for the horsepower is the same!
What size hose do I need for a 115 HP outboard?
But most smaller outboards have fittings or quick connects on them that are set for a 5/16″ hose. It’s basically the standard hose for the smaller engines. Like we said in the beginning, the 3/8″ line is required on anything that is larger than a 115 HP engine.
What is the difference between a B2 and A1 hose?
They are basically the same as the A1 hoses but do not have the fire-resistant covering that is on the outside of the hose. B2 Hoses: Are used for the fuel tank vent hose BUT ABOVE THE DECK OR NOT ENCLOSED! Basically the same as the A2 hose but without the fire-resistant covering on the outside of the hose.
What is the difference between a 5/16 and 3/8 fuel line?
We get it. But there is a little more to it than that. The 5/16″ fuel line is actually perfect for smaller outboards. Being a little smaller than the 3/8″ hose, it works great for little kicker motors, and sailboat outboard engines.
Why is it important to have a fuel line installed?
Going back to the straw theory, having the correct fuel line installed will help ensure the proper fuel consumption for the engine. Thus, keeping up and even prolonging the life of the engine. You don’t want to cause premature failure of the engine or any of the components that are in the fuel system.
What is an A1 hose?
A1 Hoses: Are used for feeding fuel from the boat fuel tank to the fuel filter bracket or the engine. AKA Below Deck Rating. They have a fire-resistant covering on the outside. They have the least permeable rating and are designed to have fuel in them at all times.