A quick and dirty check of the accumulator would be to let the car sit a couple hours, then loosen the incoming fuel line at the fuel distributor. Then if fuel sprays out, you can be pretty certain the accumulator and fuel punp check valve are holding reasonable pressure. I did this last week; attached a gauge to the incoming fuel line, and hit the pump to bring pressure up to 78. After about an hour, pressure was still at 63, and at 30 overnight.

DG