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Hi Dave, stick with it, your doing well, but its making you work for your fun right enough, the only thing i can see from the pump pics, is the tank feed unions in the pump look very restrictive, at first i thought, easy one, 'spun gears', but i can see they are keyed, so its not that. the pump is having it easy pulling oil from the tank, then struggling to return it, that restrictive size on the return and a high tank position would just be enough to tip the balance, especialy if there are more add ons on the return line with similar sized fittings, 5/8" is the minimum, 3/4" wont hurt, if you run a filter screen on the pickup tube, check it has good clearance to the pick up tube base, i cut these angled to help scavanging, some early engine cases, and most brazil cases, use a too small pick up tube size for dry sump, i also like to run 8lts minimum oil tank vol' on race tracks, as its quite possible to have 3 or 4 ltr 'hidden' in the motor and up the rocker boxes etc with g and braking involved, and then you get tank surge. food for thought anyway.... best regards.
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