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Message: [QUOTE="Strictly Diesel, post: 301105, member: 1411"] Fuel sloshing in the tank, air entrained in the fuel that is not otherwise removed by something like a FASS/AirDog, foam created by passing fuel with entrained air through a significant restriction. There is NO "if", unless you are operating your vehicle in a lab, with an elevated tank with gravity feed that never moves (no sloshing) and doesn't have a return that ever "splashes" fuel in the tank...you have air in the fuel. How much and whether its a problem depend on the truck, whether there are suction side air leaks at quick disconnects or in the tank that are creating larger pockets of "free" (easily removed) air, etc. If you have a fuel system where the fuel enters the rail and ONLY leaves by passing through an injector, 100% of any air that might be there is going through the injectors with it. If you have a system where a significant amount of the fuel flow passes "through" the rail, exits at the other end and is returned to the tank, significantly less air will pass through the injectors. This is operating under the assumption that the air is not perfectly evenly distributed in the fuel, which if you've ever done testing with clear hose to watch the air bubbles you would see is the case. Not entirely true. Not may people have spent the time and money testing this that I have. We put high quality digital readout gauges in a fuel system, with temperature probes IN THE FUEL FLOW in 6 locations. We drove the piss out of the truck, in both "stop and go" and "highway" situations (long trip, full tank to almost empty without stopping) and tracked the temperatures. We found that the fuel in the tank did NOT significantly increase in temperature over long drives, and that much of the temperature picked up by the fuel as it passed through the heads was dissipated before it made it back to the tank. I would have to go back to the notes and data to remember all of the details...but this testing is the reason I've never put a fuel cooler in my kits. As for the topic at hand, there is no reason why a 4-corner feed won't work. I personally don't care for regulating pressure BEFORE all of the pressure drop and all of the demand, particularly as far before as an AirDog will be located. I don't think it works well in a stock setup (having the regulator before the injectors) so I wouldn't do it that way in the aftermarket either. In addition, there is a perception that these trucks need big fuel lines and huge fuel flow to make power, which is simply not true. Numerous high horsepower trucks have made big power feeding fuel through the regular 1/8" NPT ports like our current regulated returns are plumbed. [/QUOTE]