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Joined: Mar 2002
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Hello: Would the tubing for the vaccum tank and the fuel line from the gas tank for 28's be of 1/4 size cooper ? (outside dia.) or what size is best for proper operation ? thank you.
N J HORST
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Joined: Dec 2001
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ChatMaster - 10,000
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ChatMaster - 10,000
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N.J. the fuel tubing on my 28 is 5/16. I get mine from NAPA in either steel or copper.
Life's a long winding trail, love Jesus and ride a good horse!
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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To be more precise, the gas line from the tank to the top of the vacuum tank is 5/16 OD, from the bottom of the vacuum tank to the carburetor is 5/16 OD, and from the top of the vacuum tank to the intake manifold is 1/4 OD. All copper. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Dec 2001
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ChatMaster - 10,000
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ChatMaster - 10,000
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Yep the vacuum line is 1/4, unless you change it and fuel line is 5/16 unless you change it.
and...is either compression connectors (those with the brass ferrels)ok or strickly flared connections used? or does it make any difference?
Now how about the wiper tubing is it 1/4 inch to the control valve and then 1/8 inch up to the wiper?
I think that the tubing from where the control valve should be to the wiper motor on my 28 is 1/8 and seems to be too small, I connected a 1/4 inch tubing from the vacuum pump connection and then a small piece of hose to the wiper motor, as a test,and it works better.
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Dec 2001
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ChatMaster - 750
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ChatMaster - 750
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I respectfully disagree. My '28 Roadster has a seamed Brass 5/16 Dia. OD pipe from the tank to the vacuum fuel pump. My '28 Sport Cabriolet has a seamed, what appears to steel, 5/16 Dia. OD pipe from the tank to the vacuum fuel pump. Definately, neither one is copper and I believe both are the original because when was the last time you saw a seamed tube on anything half way modern?
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Joined: Mar 2002
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Replies : Thank you everyone for the wonderfull help with this matter! it cleared up question's completly.
N J HORST
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Joined: Nov 2001
Posts: 115
Shade Tree Mechanic
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Shade Tree Mechanic
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The original fuel line from fuel tank to vac. tank was seamed brass (steel in some cases) not copper. With age the brass became brittle and split quite often(I still have the original brass tubing on my '27 touring). Copper & steel tubing are much easier to find and more durable. 
"Listen to the Roar of a Chevrolet Four!"
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Joined: Nov 2004
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Shade Tree Mechanic
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Shade Tree Mechanic
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I found this thread when searching for answers to my fuel line issues. Mine has had a portion of the tank fuel line removed along the frame rail and rubber hose installed for a couple feet. The former owner reported being unable to make the vacuum fuel delivery system function properly. I would like to replace the patched up fuel line with a continuous piece of tubing to the vacuum tank. When I purchase new tubing, will it be "soft" tubing in a coil or a more rigid straight length of tubing? Is there any pro's or cons to steel vs. coppe? Mine looks to be seamed steel. The manuals seem to illustrate compression fittings, but the vacuum tank which the former owner gave me has a couple flared ends as well as compression fittings.
Nothing is ever simple.
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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Replacing the line is optional as to material. If you use the steel line and the compression fittings it will make a good system. If you use the copper it will be easier to work with and perform just as well.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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