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Old 08-25-2002, 12:06 PM
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300E Stall--Vapor Lock????

Our 300E has started stalling in hot weather at slow speeds or when left idling and coolant temperature rises. Started happening after major overhaul of AC system. Replaced both fuel pumps as this seemed to be causing problem, but problems srtill exists. Plenty of spark and fuel pumps are working. It seem like there is a fuel vapor lock (too much fuel) that makes it stall when engine gets real hot. Will restart if I wait 3-5 minutes. Starts easier if I put gas pedal to the floor. Looking for any suggestions. Could it be air flow meter, which My car does'nt seem to have, fuel pressure regulator, idle valve, water temp gauge sensor, fuel pump relay, overload protection relay, EGR valve, or something as simple as the thermostat/antifreeze?????
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Old 08-25-2002, 12:18 PM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Did someone bypass (or worse, fabricate a suction line and remove) the fuel cooler in the suction line for the AC? Without it, I would presume vapor lock would be much more common.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 08-25-2002, 06:13 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Vapor lock is not a possibility at the pressures the system runs at. Vapor lock only occurs on hot restarts due to loss of pressure while shut-off, if there is leak down.

Stated differently; your car won't run at the pressures that would allow vapor locking.

Testing is the answer not parts projections.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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