out of the cabin. Do you have any more pics how you have it plumed? Was trying to wrap my head around the pic of the tubes you have there. Is it basically - Out of the block - to the remote filter in - out of the remote filter out - then T'd to the Accusump on the return line to the block? So the check valve just stops it from reverse flowing back into the filter when the Accusump pressurizes the system?
90 Twin Turbo Track Build - jsworks.org for more info!