The lpfp is set to battery voltage no matter what. You cannot increase the line pressure unless you install a custom fuel return system. Its a return-less system, meaning the pressure release is in the fuel canister itself. A larger pump just means it can supply more fuel at the set pressure. For instance, the only time i install a larger pump is when we are adding nitrous or aux fuel, because the fuel demand on the lp fuel system is higher. The minimum operating pressure of the hpfp is 350ish psi. At 600 rpm that is approximately where the high pressure system should be sitting. Did a video on it. Again. Did 330 whp on two jukes with three different turbo set ups on oem fuel pumps.

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