There are also check valves in the fuel pumps. Easily changed without removing the pumps. Your car has 2 pumps. If either of these check valves leak back you will have the hard start problem. if I remember correctly, you can clamp off the small hose coming off the accumulator and then remove the hose from the accumulator. If fuel runs out of the accumulator, it is bad.

Paul

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84 500 SEL (307,xxx miles)