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Marv D · 11-06-2011, 01:14 PM

I think everyone wants to go overkill on fuel line size,, and that's a GOOD thing. Erroring to the insufficient is engine damage looking to happen.

That said, I ran a 580 horse (Superflo dyno proven not a desktop exagerated guess) on a Mallory Comp 140 and an-6 line to a deadhead reglator. No retrun, no lean outs, no problems. Biggest dip in fuel pressure was at launch (high 1.3 sixty foot times) and stayed 5+ all the way to 10.20s @ mid 120's. It's more about the pumps ability to DELIVER fuel to the front of the car than pressure or size IMO. Just like putting your thumb over the end of the hose will create pressure and make a SMALL stream spray a long ways,, delivery volume is dismal. A large line will deliver more volume at a lower presure. So using an-8 lines and big pumps,, to push through a crap regulator with small 3/8"npt restrictive fittings with a little 1/4" hole in them is a waste.

Here is some really good reading on fuel systems. Sam did a great job on these pages

http://www.centuryperformance.com/fu...e-spg-140.html

http://www.centuryperformance.com/fu...p-spg-141.html

When it's all said and done and you convince yourself you need a $1000 an-10 fuel system,, just remember PRESSURE is a restriction,, the GPH or GPM a pump can deliver at zero psi is meaningless. What it can DELIVER at 6psi is what were concerned about.

11-06-2011, 01:14 PM	#8
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: fuel line size I think everyone wants to go overkill on fuel line size,, and that's a GOOD thing. Erroring to the insufficient is engine damage looking to happen. That said, I ran a 580 horse (Superflo dyno proven not a desktop exagerated guess) on a Mallory Comp 140 and an-6 line to a deadhead reglator. No retrun, no lean outs, no problems. Biggest dip in fuel pressure was at launch (high 1.3 sixty foot times) and stayed 5+ all the way to 10.20s @ mid 120's. It's more about the pumps ability to DELIVER fuel to the front of the car than pressure or size IMO. Just like putting your thumb over the end of the hose will create pressure and make a SMALL stream spray a long ways,, delivery volume is dismal. A large line will deliver more volume at a lower presure. So using an-8 lines and big pumps,, to push through a crap regulator with small 3/8"npt restrictive fittings with a little 1/4" hole in them is a waste. Here is some really good reading on fuel systems. Sam did a great job on these pages http://www.centuryperformance.com/fu...e-spg-140.html http://www.centuryperformance.com/fu...p-spg-141.html When it's all said and done and you convince yourself you need a $1000 an-10 fuel system,, just remember PRESSURE is a restriction,, the GPH or GPM a pump can deliver at zero psi is meaningless. What it can DELIVER at 6psi is what were concerned about. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. Last edited by Marv D; 11-06-2011 at 01:31 PM.