92 500sl 129.066. issue(s) cold hard start. if I turn key on and try and start 20-25 seconds or more to start. If I try and start count 4 seconds turn off before start starts right up. if I turn key on and off 3-4 time before starting starts right up. I am loosing fuel pressure. If accumulator diaphragm is leaking this will cause hard cold start. Questions: does accumulator regulate fuel pressure? Question: can Pressure regulator also cause this problem? if so how can you tell which is the problem? I have no way to measure the fuel pressure. Also experiencing cold rough idle then after warm up mostly goes away not sure related Any info would be appreciated