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SVTPerformance's Chain of Restaurants
The Distillery
Leathal budget return system any one using it?
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<blockquote data-quote="JeremyH" data-source="post: 15630497" data-attributes="member: 160292"><p>Not exactly a correct statement remember pressure and volume(flow) for a fuel pump are inversely related not proportional as you state in your garden hose analogy. For that garden hose pressure is not regulated at the nozzle, you changed the flow by adjusting the valve at the source where pressure is set from the main line. You increased flow by opening the valve further which increased the speed of the water as it exited the hose. In a semi closed system where final pressure is regulated at the end of the hose, the lower fuel pump outlet pressure is the higher the pumps flows through the line, the higher pump output pressure is the less flow you get. </p><p></p><p>Actual flow of the pump or pumps is determined by pump capacity and discharge pressure at the pump outlet. Any line or filter restriction as the fuel travels causes a pressure drop not rise. So pressure at the end of the system ie at the rails/injectors and up to the regulator which controls pressure is less than pump outlet pressure.</p><p></p><p>So the restriction caused by friction in the line/filter between pump and regulator will determine pump outlet pressure and flow. For example a 5/16" id factory line at say 600lph of flow may have 40psi at the rails but 50psi pressure at the pump outlet. Where as a 1/2" or 8an line may only have a 45psi pump outlet pressure to get 40psi to the rails which means you now have more flow. So essentially the shorter the line the smaller it can be, the longer the line, the larger it needs to be to not affect flow at the regulated pressure. </p><p></p><p>The point where pressure at the rails could rise uncontrollably is if the non pressurized return line coming out of the regulator back to the tank is too small for the flow of the pump(s) at the regulated pressure and engine speed (injector pulse width). So at idle you might raise the minimum pressure you can achieve with the regulator. As rpms climb injectors pulse longer and more volume of fuel is consumed by the engine and pressure will come back down.</p><p></p><p>Here are some rules of thumb for a typical fuel setup for those that like to calculate this stuff:</p><p>Oem 5/16 port paper filter 2-3psi loss (clean/new filter)</p><p>Aftermarket higher flow filter 1psi loss (clean/new filter)</p><p>10an line 1psi loss every 9ft</p><p>8an line 1psi loss every 6ft</p><p>6an line 1psi loss every 3ft.</p></blockquote><p></p>
[QUOTE="JeremyH, post: 15630497, member: 160292"] Not exactly a correct statement remember pressure and volume(flow) for a fuel pump are inversely related not proportional as you state in your garden hose analogy. For that garden hose pressure is not regulated at the nozzle, you changed the flow by adjusting the valve at the source where pressure is set from the main line. You increased flow by opening the valve further which increased the speed of the water as it exited the hose. In a semi closed system where final pressure is regulated at the end of the hose, the lower fuel pump outlet pressure is the higher the pumps flows through the line, the higher pump output pressure is the less flow you get. Actual flow of the pump or pumps is determined by pump capacity and discharge pressure at the pump outlet. Any line or filter restriction as the fuel travels causes a pressure drop not rise. So pressure at the end of the system ie at the rails/injectors and up to the regulator which controls pressure is less than pump outlet pressure. So the restriction caused by friction in the line/filter between pump and regulator will determine pump outlet pressure and flow. For example a 5/16" id factory line at say 600lph of flow may have 40psi at the rails but 50psi pressure at the pump outlet. Where as a 1/2" or 8an line may only have a 45psi pump outlet pressure to get 40psi to the rails which means you now have more flow. So essentially the shorter the line the smaller it can be, the longer the line, the larger it needs to be to not affect flow at the regulated pressure. The point where pressure at the rails could rise uncontrollably is if the non pressurized return line coming out of the regulator back to the tank is too small for the flow of the pump(s) at the regulated pressure and engine speed (injector pulse width). So at idle you might raise the minimum pressure you can achieve with the regulator. As rpms climb injectors pulse longer and more volume of fuel is consumed by the engine and pressure will come back down. Here are some rules of thumb for a typical fuel setup for those that like to calculate this stuff: Oem 5/16 port paper filter 2-3psi loss (clean/new filter) Aftermarket higher flow filter 1psi loss (clean/new filter) 10an line 1psi loss every 9ft 8an line 1psi loss every 6ft 6an line 1psi loss every 3ft. [/QUOTE]
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The Distillery
Leathal budget return system any one using it?
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