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Most regulators need to be on the return line, after the rail and before the return hose to the tank. This keeps the rails at 29psi (or whatever setting). If placed on the supply, you only keep the supply hose from the pump pressurized and effective zero pressure at the rails. Effective zero pressure because there is little restriction back to the tank.
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Current Project: 73 914, 1.8t, ~300hp, 930 Brakes, Roll Cage
Past Projects:
69 911, converted to C2 wide body cabriolet 3.2L
72 914, Ford 5.0L V8 EFI
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