At least on some vehicles. We recommend a 3/8" or larger fuel line BETWEEN THE TANK AND THE PUMP at 350 hp, and a 1/2" or larger line at 450 hp. The fuel line from the pump to the carb can be a little smaller since the fuel is under pressure, rather than under vacuum.
Full Answer
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).
What is the pressure drop thru a ½” fuel line?
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).
How much HP can a 3/8 inch fuel line support?
A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Given a big enough pump a 3/8” steel line could support 1000 HP. The simple way to know is to install an electronic fuel pressure gauge.
What is a fuel line on a car?
The United States Environmental Protection Agency defines a fuel line as “all hoses or tubing designed to contain liquid fuel or fuel vapor. This includes all hoses or tubing for the filler neck, for connections between dual fuel tanks, and for connecting a carbon canister to the fuel tank.
What size is standard fuel line?
Typically, these 1/4" and 5/16" line sizes are in use for low flow or OEM systems, but are commonly used in high performance applications for pressure gauges as well as plumbing between the Regulator and Intake Manifold.
Which fuel line is bigger 3/8 or 5 16?
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. Being smaller allows it to go easily into a smaller rigging tube, depending on the application.
What size is my fuel hose?
1:323:13How To Measure the Diameter Of Any Hose - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it's 6 over 16 so 6 6 / 16 very very simplest and all that you do is you're taking 6 sixteenthsMoreSo it's 6 over 16 so 6 6 / 16 very very simplest and all that you do is you're taking 6 sixteenths of an inch and divide it by 2 if you can so 6 16 divided by 2 is 3/8.
What size is fuel fitting?
The sizes typically used in fuel systems are AN6 / Dash 6 / -6, which equates to a thread measuring 9/16” x 18 (threads per inch) with a hose bore around 3/8”, and AN8 / Dash 8 / -8 which has a thread measuring 3/4” x 16 (threads per inch) with a hose bore of around 1/2”.
Is 3/8 fuel line big enough?
A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Given a big enough pump a 3/8” steel line could support 1000 HP. The simple way to know is to install an electronic fuel pressure gauge. If the pressure falls as the engine RPM's go up you need more pump head.
How much horsepower will a 5/16 fuel line support?
If you're just cruising around with a carbed SBC, you'll probably be fine with a 5/16" line up to about 500 HP because you'll never tax the system enough to starve the motor of fuel.
What is the OD of 5/16 fuel line?
Fuel Hose, ID 5/16 In, OD 0.56 In, Black.
What is the OD of 3/8 fuel hose?
FUEL LINE HOSE 9.5MM (3/8") NITRILE TUBE ID 10MM X OD 16MM NON-FUEL INJECTION 50 PSI - Collier & Miller.
What is the outer diameter of 5/16 fuel line?
9/16"Inside Diameter: 5/16" (7.9mm) Outside Diameter: 9/16" (14.15mm)
How do I know what size an fittings I have?
As mentioned earlier, you can always identify AN fittings based on the male thread size (outside diameter). These sizes are constant regardless of brand, hose type, or fitting configuration. If your fitting has a convex 37 degree flare at the end, the threads will tell you the AN size (and vice-versa).
Are fuel lines NPT?
NPT is a tapered thread common to plumbing connections in North America, and is also the most common thread type in fuel line components.
What size fuel return line should I use?
The Fuel Return Line should be at least the same size, or one size larger than the supply. Make sure there are no sharp bends or kinks. The return line should direct fuel close to the bottom of the tank and away from the pickup.
What fuel system does a Ford FE use?
The vast majority of FE engines use a single carburetor (2- ...
What carburetor is used in FE engines?
The vast majority of FE engines use a single carburetor (2- or 4-barrel) mounted to a cast-iron intake manifold. Although produced in a limited number each year, the factory high performance engines had a lot more variety in fuel delivery.
How many barrels are in a Holley?
Holleys were offered in a single 4-barrel, two 4- barrels, or three 2-barrels. The two 4-barrel engines used a pair of 4160 model Holley carbs mounted in line (more details later). This Tech Tip is From the Full Book, HOW TO BUILD MAX-PERFORMANCE FORD FE ENGINES.
How big is a carb pump?
Most carbs start off with something around .025 inch, but sizes of up to .037 inch are common for tuning. The pump itself is below the fuel bowl, and can be either a 30- or 50-cc piece. The volume measurement referenced is actually an average of 10 strokes.
What does the hole below the float level do?
The holes below the float level serve as added fuel feeds; those above act as additional air bleeds, and those in the middle as a combination of the two, which produces aerated fuel. As the engine RPM goes up, the fuel level normally drops and the overall bleed package changes.
Is a Holley 4150 dual feed?
Holley carbs, whether 4150 or 4160, can be either single or dual feed. A single-feed carburetor has a fuel inlet on the linkage side of the primary bowl, and a transfer tube running back to the secondary bowl on the opposite side.
Where is the float level on a Holley?
The float level on a Holley is externally adjustable, and verifiable with the brass sight plug on the side. The normally accepted standard is to have the fuel just at the bottom of the sight plug, but I prefer to set the level with the bowl removed and inverted, and the float parallel with the top of the bowl.
