Fuel supply Hose ID, I think I'm starving it for gas Options

[Joe Ricard]

So I have some confidence in my carb tuning and hotrodding ability. She's pretty frigging fast now.
So here is what my sypmtom is. Runs great on the idle jets and will pull to 6 grand on the mains. I can hold it wide open to 120 MPH But not long a few seconds or so. tends to lean out by glancing at the gauge.

Engine just flat shits and gits on the Autocross course.

when I let off and get back to normal cruising the carbs will spit on the idle jets until what seems like the bowls fill back up then runs fine and will cruise 85-90 all day long @ indicated 13.5 to 12 to 1 air fuel. (narrow band)

Running a CB rotary pump 3-5 PSI through 5/16 fuel line. all filters are new Pressure regulator 3 psi. 40IDF's

I am not wanting to but may have to go bigger on the gas supply to this hopped up 2.0l .500 lift 300 duration cam ported head with stock size valves.

AND my Tangerine header will be on the door step any day now.

Does this make sense or am I just makng excuses for a big Holley pump and 3/8 fuel line.

[tommy914]

Joe,
It sounds like we need a way to figure out if the flow rate at the carb is being restricted. Can you measure the flow of the pump unrestricted at the tank, then compare that to the flow rate at carb inlet? Then remove/replace regulators, filters and line kinks until they are the same?

Oh, and let us know what you find out. I am running that cheap dial regulator and glass filters too. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)