1987 260E
Vehicle starts and idles great when its cold.
After a run sufficient to warm up the motor if I turn it off for more than say 20 mins. it takes forever to start. Turns over great but will not fire. Once it fires it idles great and runs fine. When I did a search I found mostly the reverse, poor cold starting, no problems once its running.
Question: is there an accumulator or something like it in the fuel system that maintains fuel pressure while the vehicle is idle (motor off).

Appreciate any input
Thanks
Michael