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Old 12-31-2005, 06:13 AM
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Fuel Line Plumbing


I have to some fuel line plumbing on my 72 nova street car. I am having a difficult time choosing what is best for my application. My main concern is how to plumb from the mechanical block mounted fuel pump to my 4bbl carb. The fuel pump is new from Holley and has 3/8" female NPT fittings. The carb is a Holley 4150 single connection with a 3/8" barbed rubber hose connection. I want to either use 3/8" steel or aluminum and make my own bends. I don't want to use flexible braided line. I will be installing a inline fuel filter and pressure gauge adapter - possibly a shutoff valve also.

I guess my main problem is whether to use steel or aluminum fuel line - and then do I use compression or flared fittings? Until I decide which to use I can't buy anything. I will need fitting for the fuel pump, filters, carb connection, gauge adaptor, etc. I will somehow have to go from hard tubing to a rubber 3/8" hose connection at the carb - unless the fuel line connection on the carb is removable and replacable with something that can be hard piped.

anyway - I need some advice with all this stuff. Plus I have to buy a flaring tool and tubing bender. there are many types available especially the tubing benders. Please advise as to my best course of action. thanks.

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Old 12-31-2005, 07:16 AM
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Man if youre gonna buy your own flaring tool, I would first look at pre-bent lines for your application. Now even some parts houses have lines in several different sizes and fittings for most vehicles. man if it was me Id go ahead with steel, I dont know what you would gain by using aluminum. When going from hard line to flex line there really has to be a notch in the tubing that you can put a gear clamp behind.
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Old 12-31-2005, 08:51 AM
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Since I run my street car at the track sometimes. I have to abide by NHRA rules. Maximum of 12" of rubber fuel line. I use a brass 5/16 hose nipple off the pump to 5/16 brake line bent 90 degrees which runs about 6 inches up the front of the block. Attach the two together with two inches of rubber fuel line. Clamp each end. Insert a fuel filter with 5/16 hose ends. Attach two inches of fuel line to each end. Then to another brake line bent 90 degrees towards the carb. Another 2 inches of rubber fuel line between the line and carb. The rubber fuel line adds up to a total of 8 inches. The advantages are low vibration, easy disconnection, and easy fuel filter change. To keep the rubber line from slipping off the brake lines. I use the mushroom fitting from a double inverted flaring tool to bulge the end of the brake line. (see pic)

My race car uses 1/2 aluminum line up to the bell housing. Then to 1/2 inch braided line split into two 5/16 lines at the regulator.
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Last edited by bracketeer; 12-31-2005 at 09:05 AM.
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