Carburetor fuel line diameter

[tony-muscle]

Does anyone know the diameter of the fuel line from the pump to the carburetor? (I have a 351-4V). Mine is 5/16" but I am second guessing since the line from the tank to the pump is 3/8". I have no idea if mine is original or replaced.

 

[red351]

Yes 5/16"

 

[Stanglover]

Yes, 5/16 is the original diameter, but if you are upping your HP, a 3/8" has been recommended. Also, as I now have a Holley on my 4V, I am replacing the pump to carb line with 3/8" to get rid of the rubber line I have to use across the front of the carb to join the 5/16" line to the carb. It looks messy to say the least and I can make it a direct connection with the appropriate fittings.

 

[tony-muscle]

Yes, 5/16 is the original diameter, but if you are upping your HP, a 3/8" has been recommended. Also, as I now have a Holley on my 4V, I am replacing the pump to carb line with 3/8" to get rid of the rubber line I have to use across the front of the carb to join the 5/16" line to the carb. It looks messy to say the least and I can make it a direct connection with the appropriate fittings.

Do you know if they sell a 3/8 repro? Or I might as well make it myself. I wonder if I should keep steel tubing or change to a braided hose.

1971 M-code Mach 1

 

[Stanglover]

Yes, 5/16 is the original diameter, but if you are upping your HP, a 3/8" has been recommended. Also, as I now have a Holley on my 4V, I am replacing the pump to carb line with 3/8" to get rid of the rubber line I have to use across the front of the carb to join the 5/16" line to the carb. It looks messy to say the least and I can make it a direct connection with the appropriate fittings.

Do you know if they sell a 3/8 repro? Or I might as well make it myself. I wonder if I should keep steel tubing or change to a braided hose.

1971 M-code Mach 1

Don't think so and if they do, it will likely be the same as original for an Autolite carb. I will need to make it up as its' going to be longer, but I'm hoping to find a length of ready made fuel line tube so I don't have to piss around with flare tools although that may just happen anyways.

 

[MeZapU]

You can still make 500ish horsepower using the stock 5/16" fuel line. I did it on my 1985 Mustang feeding a 408w. Made 432hp at the rear wheels.