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The Accusump adds 2 quarts of capacity to the oiling system, so common sense says that it takes an extra 2 quarts of oil to fill it up. In practice, the Accusump-equipped big-block required slightly more than 2 quarts to account for the volume of the oil lines. The final step before giving everything a test run is pre-charging the Accusump with pressurized air. This involves filling up the air side of the Accusump to 60 psi to make sure that the piston is fully extended, then checking for leaks. The pressure should then be bled down to 7-10 psi using the Schrader valve. After starting the engine, the pressure gauge on the air side of the Accusump should be the same as the pressure reading on the oil pressure gauge.