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Power Strokes
7.3 Aftermarket
Let's talk fuel pumps
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[QUOTE="TARM, post: 1420662, member: 578"] Just wanted to point out there is no additional strain on properly setup siphon feed vs and sump feed. They are both gravity feed system and flow the same flow rate at the same head pressures based on the fuel hieght in tank. The ONLY time there is additional strain is when the siphon is started for the very first time or is broken. That only happens when you run out of diesel fuel in the tank not when you shut off the engine. I known it seem logical that the pump has to pull fuel up the pipe all the time but it does not. Once the siphon is established it will keep flowing. I even did a demonstration using a hose attached to the water jug vs one dropped over the edge to the bottom to establish a siphon. Timed them draining 1 gal of water. They were +/- 1 sec error rate. Sumps can be handy when fuel levels are low sometimes as they give a bit extra in the sump catch. But in terms of the vacuum / strain your pump has to pull to move fuel there is no appreciable difference between a sump and siphon. There are also other ways that offer other benefits and take way liability and risk than going from traditional siphon to the sump setups used on the super duty tanks. Surge tank with fuel pump intra-mount. [/QUOTE]
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