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but the smaller your line the greater the pressure drop from one side to another. What this means is that your fuel pump has to work harder to supply the same flow and pressure to the injector. If you look at the charts for a fuel pump they are rated by flow at a given pressure. Your FPR will maintain a given pressure based on your boost level, I forget for sure but think it is 45psi +1psi for each pound of boost. So if you are running 18psi then you need 63psi at the regulator. Whatever pressure drop is present across your fuel system is then added to this, and that's the pressure your pump must provide (at a minimum). So pulling a number from no where, if you had a 6psi drop, then your pump would need to put out 69psi. Big deal right? well if you look at the flow specs for common fuel pumps you will see that the flow capacity seriously drops off at higher pressures. An Aeromotive 340stealth pump looses about 25 or 30 LPH of flow capacity between 60 and 70 psi. So the short answer is that if a stock fuel pump with a stock line can support 550ish HP, the same pump could support more HP with a larger feed line. And if you ever want to use a fuel like ethanol that requires significantly more flow, then increasing your feed line diameter can make a big difference.
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