As i am sitting here putting together a parts list for a few beta full replacement fuel systems, I got to wondering if there is a valid reason why people are using 1/2 and even 5/8 fuel lines on their trucks? Is it for more power, looks, or just simply bragging rights?

On my own truck I have the intank mods done, and use the OEM 3/8 lines to my FASS pump, then 3/8 hose to the motor where it splits to two 1/4 lines, one for each head, at which point you have a 1/8" npt port. I monitor my fuel pressure from the backside of the heads(opposite fuel feed) to make sure I am seeing what is left of the fuel pressure. And even with my 250cc injectors that recently dyno'd at 450hp, I still don't get any fuel pressure drop. Am I missing something here?

Just want to put together the best, most effeicient and affordable system I can. Part of that is not including parts to fix stuff that isn't broke. Anyone who is interested in being a beta tester, shoot me a PM.

My plan currently is to offer a full replacement fuel system including a Fass 95GPH pump, my own 2micron filter, a CCK, and all the hoses, fittings and brackets needed hopefully for around $650 retail. A fuel pressure gage will be optional, and these systems will come preset to 75 psi.

 

Ok going to speak from the side I know well even though it's gas application. On my race truck I run a larger line on the suction side of the pump so there is never a restriction or vacumn on that side. I don't believe our diesels need 5/8" but it's also then a guarantee tha it won't ever be the restriction. But if you need 3/8 on the pressure side of the pump you should need the next size larger on the vac side of the pump so probably 1/2". now if the 3/8" is suffiecient on that side what it tells me is that the pressure side is over sized.
What I Have found in my race truck is to run a 250gph pump and maintain 9psi at he regulator for the carb I have to run a 10-AN feed line to it, I then run a 8-AN from the pump to the regulator and to the carb so that under full throttle I never lose any pressure at the regulator. When I ran -8 for the entire system 3 seconds into the run I started losing fuel pressure at he regulator.
Now considering that engine burns about a gallon of fuel in 5 seconds at full throttle and I am not sure you can make a 7.3 digest that much fuel I would say that truthfully anything over 1/2" feed line is probably overkill, but would still say whatever your high pressure side line is, you would want to be one size larger on teh feed side so as to maintain constant supply without any restriction going into the pump

 

holy crap... what kind of truck are you runing?

 

just a ford ranger

 

lol i dont think "Just" is proper description of a ranger that burns a gallon in 5 seconds lol

 

lol thats funny. I have been thinking about upgrading my fuel lines. for the reason of just because. But 1 gal in 3 seconds is outstanding. id like to see a pic of "just a ranger"

 

Check his gallery.

 

Of course it's just a ranger. Just your everyday big block garden variety 700hp daily grind Ranger.

Yeah, I don't think that much fuel is required for our trucks. That's the other thing about Our diesels vs gas. In a gasser, fuel pressure needs to be maintained at near exact pressure. Our trucks don't care as long as it is above 55. That and no matter how big the lines are before the pump, could be 6" utility line, you still got to go through the 1/8 npt port on the head.

 

Sent you a PM

 

umm actually closer to 900+ lol



Well that is partially true it's actually 2 1/8" ports so what is the area of the combined ports?

 

1/8" port is .125" diameter So that would be Area= 0.01227

 

But you don't HAVE to feed the fuel from only one port. If you decide you need it, you can make a dual dead-end system, where fuel is fed to the head from both ports on each head.

 

Just because of the fasct i have two fuel systems, that is exactly how I have mine rigged up. I have one complete fuel system-Tank, pump, filter, lines and fuel feeding the rear two ports(WVO), and another complete fuel system feeding the front two ports(diesel). I can have one, the other or both fuel systems on, potentially feeding all four ports on the heads. I measure my fuel pressure opposite the diesel feed, so when on diesel only, I am measuring the pressure that is left over. And on top of that, I have a purge solenoid on my WVO side to allow a WVO purge back to the WVO tank. When on diesel this allows about an ounce/second (28GPH) when I push the purge button. Even when WOT in setting five, bleeding off an extra 28gph, I still can't drop my pressure below 65. So I can pretty well guarantee that this will be good for 500hp. Anyone confused yet??