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James asked 1988 mercedes 420 sel cold start?
In the AM or after setting for 3 hrs engine cold Engine hard to start extended cranking key cycling several times . seems like the fuel pressure bleeds off . i replaced the check valves a the fuel pumps
And got the following answer:
this is an bosch, k-jet system, system pressure is 72 psi, control pressure is 22 psi at 40 degrees F and approx 56 psi at operating temp. note there is a thermo time switch that operates the cold start injector for approx 10 seconds on initial first start of day \i strongly suspect your thermo time switch by your complaint but always check fuel pressures first. NOTES: 1. this engine in north american trim uses a fuel cooler that is installed on the "cold" low -pressure piping of the A/C system. if the a/c is inoperative a test of this system is imparitive,as raw fuel entering here could cause a fatel fire inside the passenger cabin in the event of a crash. [3 fuel coolers have failed in the last 27 years,on cars that i regularly service] so this is rare but not totally unheard of. 2. instead of a warm up regulator your car may be equipped with an "electro hydraulic unit, these rarely fail. 3. A NOTE ON FUEL/FIRE SAFETY. all fuel pressure tests should be preformed outside of any building and a large A.B.C. rated extinguisher kept at ready hand.