Tim, some points on fuel pressure, not volume, just pressure.
A carburetor cannot tolerate over about 6 pounds of pressure. I am ignoring specialized racing carbs, let's just talk ordinary carbs.
Inside a carb is a tiny needle valve which opens and closes to allow gasoline in. This valve is connected to a "float" which rises and falls with the fuel level inside a "float bowl" internal to a carb. This is _exactly_ like the toilet in your house which has a valve attached to a float. Pressing down the gas pedal on your truck is just like pressing down the handle on your toilet and, oddly, same type of crap comes out the exhaust.
Whether a carburetor or a toilet, the fuel pressure or the water pressure must be kept below a certain pressure limit. When this pressure is exceeded, the valve blows apart and flow is constant, non-stop, your carburetor floods or your bathroom floods. Either leaves you stuck with a real mess, not sure which is worse to clean up.
For a typical carburetor, about 6 pounds is the maximum limit, 2 pounds is the minimum limit. A pressure of 4 pounds is Goldilocks just right. There are variations, but this is the general rule. While volume flow is good, pressure does not much matter. Gauge your need on much gas needs to be delivered to your carb, not how much pressure is needed.
This is an easy experiment any reader can enjoy in a just a few minutes. Pretend your toilet is a carburetor. Take the water tank lid off. Close the water valve down at the wall. Flush your toilet and watch the water in the tank. At first, a big burst of water will come out of the supply valve, then fall off to just a dribble, finally stopping. Your tank never will fill. Crack open your water valve just a tiny bit. Water will only dribble out of the valve, takes forever to fill your water tank. Open the valve all the way, tank fills up, no problem.
This is the difference between volume flow and pressure. Whether your toilet water valve at the wall is opened or closed, the water pressure remains the same. However, flow of water changes dramatically with valve changes; on or off, dribble or full flow.
Volume of flow is what counts, not the pressure.
Billyray
