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Carburetor fuel line diameter
#1
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.

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
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#2
Yes 5/16"
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#3
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.
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#4
(12-15-2016, 10:11 AM)Stanglover Wrote: 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

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
  Reply
#5
tony-muscle;284738 Wrote:
(12-15-2016, 10:11 AM)Stanglover Wrote: 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.
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#6
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.

Mike
__________________________________
Black 1985 GT
Yellow 1973 Mustang Mach 1
Black 2012 5.0 GT, 6-speed, Brembo brakes, 3.73's
Wimbledon White 1966 F-100 Shortbed Styleside, 390ci, Tremec 3550, FiTech EFI
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