Increased fuel line size?
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,637
Likes: 27
From: Norwalk Ct
Increased fuel line size?
I am running a 396 small block, aluminum heads, solid roller quad dellorto set up.
I have been reading how the fuel line size needs to go up from 3/8" to feed over 425 - 450 hp.
But I have questions...as the barb on the fuel tank is for 3/8" so the fuel outlet from the tank would be the same. I could increase the line from the fuel pump (Holley blue) to the fuel regulator (full length of the car) to -8AN.
Then it would hit my fuel pressure regulator (which is set at 2.75/3psi as thats all the carbs need) and the only fittings available for the carbs are -6AN.
So would the increase to -8AN for that length reep benefits or will the psi limitations of the fuel pressure regulator/carb feed lines begate that? or is it a matter of volume and it would help?
cheers,
Nick
I have been reading how the fuel line size needs to go up from 3/8" to feed over 425 - 450 hp.
But I have questions...as the barb on the fuel tank is for 3/8" so the fuel outlet from the tank would be the same. I could increase the line from the fuel pump (Holley blue) to the fuel regulator (full length of the car) to -8AN.
Then it would hit my fuel pressure regulator (which is set at 2.75/3psi as thats all the carbs need) and the only fittings available for the carbs are -6AN.
So would the increase to -8AN for that length reep benefits or will the psi limitations of the fuel pressure regulator/carb feed lines begate that? or is it a matter of volume and it would help?
cheers,
Nick
Last edited by lvrpool32; Oct 1, 2007 at 06:27 PM.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Since you are running an electric pump and I assume it is near the tank you should have no problems to about 600HP.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
The stock fuel line and a stock fuel pump feed a 600 HP (with headers) L88. I plan on a 3/8 fuel line, a 130 GPH mechanical pump and a regulator to feed 500 plus HP + a 150 Nitrous shot. Look at the size of the needle and seat and the jets. 3/8 should feed about anything you throw at it with a higher volume pump.
Last edited by 63mako; Oct 1, 2007 at 09:57 PM.
