Fuel System
Thread Starter
Junior Member
Joined: Apr 2007
Posts: 6
From: Sydney Australia
This is probably a stupid question but I,m building a 13B with 48 IDA, why do I need a 1/2 inch fuel line if all the fuel is going through a 3 mm needle and seat, and could I fit a fuel surge tank up the front of the car and run a 1/2 inch line from there?
Senior Member
Joined: Oct 2001
Posts: 790
From: Portland, OR
Originally Posted by Mark T.' post='885520' date='Oct 15 2007, 11:33 PM
This is probably a stupid question but I,m building a 13B with 48 IDA, why do I need a 1/2 inch fuel line if all the fuel is going through a 3 mm needle and seat, and could I fit a fuel surge tank up the front of the car and run a 1/2 inch line from there?
Probably the same reason why you water grass with a 1" hose through a little tiny nozzle.
Injected cars use 3/8 line, so 1/2 sounds big, but I'm not a carb guy. Maybe because of the lower line pressure requres more flow.
Fabricator
Joined: Jan 2004
Posts: 1,322
From: Central Ohio (Hebron) Zephyrhills Fla.
Originally Posted by Mark T.' post='885520' date='Oct 15 2007, 04:33 PM
This is probably a stupid question but I,m building a 13B with 48 IDA, why do I need a 1/2 inch fuel line if all the fuel is going through a 3 mm needle and seat, and could I fit a fuel surge tank up the front of the car and run a 1/2 inch line from there?
I have a 5/16" ID line from two pumps on the fuel cell up to a regulator beside the engine. Then a 1/4"
ID line to the carb. Pressure is 7 PSI which is all the stock float can handle.
Never a problem.
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