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Power Strokes
6.0 Aftermarket
Anybody with regulated fuel return read this!
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[QUOTE="Strictly Diesel, post: 446116, member: 1411"] Say what? That made no sense at all! 1. Regulator isn't making any demands on the system. It's a dumb device that simply opens or closes based on pressure. The fuel injectors and programming make demands on the fuel system, the regulator simply attempts to maintain pressure by closing and reducing return FLOW (back to the tank) during times of high demand. 2. "more psi on the regulator" (that would mean turning the pressure UP) does NOT "increase return line psi". It you turn the pressure up, you are holding the diaphragm closed and reducing return flow. If you reduce return flow without changing the backpressure in the return line, you will effectively reduce return line pressure (not that we care about return line pressure). 3. Unless you have the regulator adjusted to such a low pressure that the return is always open and flowing too much fuel back to the tank, the pressure setting on the regulator has nothing to do with "running the pump dry". With a properly designed fuel system and properly located and adjusted regulator, the only thing we care about is volume. If you have enough volume for the demand (injectors and programming), you will not have pressure drop. If your demand exceeds the flow capability of your pump, you will have pressure drop. In order to "run the pump dry", you would literally have to have the pressure drop to 0psi. The only thing I can think of that might explain what you are thinking is this example. Lets say you have a truck with the pressure regulator set at 65psi. When you go to WOT, the fuel pressure drops to 50psi. If you turn the pressure regualtor down to 50psi and go to WOT again and the pressure now holds steady without dropping, did you change anything with regard to the pump? The answer is NO. In the first run, the pump was moving enough fuel to maintain 50psi of pressure at WOT. In the second run the pump was moving enough fuel to maintain 50psi of pressure at WOT. More than likely the regulator was closed and returning no fuel during both runs, since the pump was at its limit for the demand. The only difference between the examples is that the pressure would be higher at less than WOT in the first test and the fuel pressure gauge won't be dropping in the second test. The pump didn't "run dry" in either case...and in both cases the pump isn't moving enough fuel for the specific demand of this combination...assuming 65psi is the target pressure you want to maintain. I can't comment on the power gain with lower pressure because I've never tested it. We've always recommended 60-65psi because that's what the injector builders we've talked to wanted to see to prevent injector failures. As for whether this is only beneficial to someone that's not maintaining pressure...see my example above again. 50psi because that's what the regulator is set at and 50psi because that's all the pump will support is still 50psi at the injectors. Either way, there has to be enough fuel volume to the fuel rails to make that pressure. If the engine really makes more power at 50psi, why don't we have people reporting that their truck feels stronger when they stomp the pedal and the pressure drops? I think that this calls for more investigation...but I can tell you that all of the trucks we've worked on felt much better with 60psi+. [/QUOTE]
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Anybody with regulated fuel return read this!
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