Is the accumulator the thing that maintains pressure after shut down? If so then I think you would test for pressure leak down. Basically let the car sit overnight and then check for fuel pressure. But I am not sure. I learned about FI systems on my old L-Jetronic Toyota and it didn't have a fuel accumulator AFAIK.

So what percentage of the time is it hard to start and how long does it take to start those times? Put in the OVP first and see what happens.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra