How much pressure does your fuel pump make and will that damage the filter element?
The accumulator will retain little to no pressure. I'll install some reducer bushings in the larger ports, so that all 3 ports are equal in size. With the return line being equall in size to the supply line, there won't really be a chance for pressure to build up.
I plan on feeding it with a low pressure pump, intended for carburator applications. I think they typically push about 7 or 8 psi, but that's irrelevant.