I'm sure you've seen this but
AccusumpTM not filling or filling too slowly
It should be noted that the standard electric valve units fill slowly. The design of the valve is to ensure that too much oil is not diverted from the engine during refill. These units are recommended for pre-oiling and not for surge control. The EPC electric valve will fill slowly until the pressure threshold is reached at which time it will rapid fill.
Other reasons for slow or no refill:
1) The manual valve is not being opened completely.
2) The EPC is wired incorrectly. When the pressure is above the threshold, the valve should not be energized.
3) The wrong EPC pressure threshold was selected for your engine's pressure range. The pressure threshold
should be below the engines normal operating pressure.
4) The EPC valve may be plumbed incorrectly. The pressure sender should be installed closer to the engine than
the electric valve.
5) The electric valve may be installed backwards. It should be mounted so the port marked “IN†is plumbed to
the AccusumpsTM and the port marked “Out†is plumbed to the line running to the engine. When the valve is
mounted backwards oil will not enter when it is in the off position.
6) The feed lines or connecting port is too small.
7) The pre-charge is too high and not letting oil enter.
8) The unit is bent, distorted or mounted incorrectly.