Mercedes Benz repair: 1969 Mercedes 280sl, mercedes benz 280sl, fuel pressure regulator

Question
this 280 sl is a 6 cyl  it has sat for a long time  we installed new spark plugs   ran great, but is loading up with unburned fuel, is there a way to check the fuel pressure regulator?  the plugs are black with dry black soot. I am a class A mechanic, but can not find info  thanks

Answer
A fuel pressure regulator failure is very rare.
The cold start valve could be bad, they are a common failure = excess fuel.
Have you tested or replaced the ignition coil, read the FYI threads first.
The fuel injection pump thermostat may be bad = excess fuel when warm.
The thermo time switch for the cold start valve could be bad.

Here are some threads you should read as FYI and do not do.
280SL fuel injection question
http://www.mercedesshop.com/shopforum/showthread.php3?t=18748

Mechanical Fuel Injection Pump not working properly
http://www.mercedesshop.com/shopforum/showthread.php3?t=96115

The SL is in a class alone.
I suggest you join http://mbca.org/
a local SL club for help/support
and mercedesshop.com/shopforum Vintage Mercedes
http://www.mercedesshop.com/shopforum/forumdisplay.php3?f=12

Here are two SL club links.
http://www.zianet.com/SLlover/page70.html
http://www.sl113.org/home.asp

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1969 Mercedes Benz 280SL
Part: F.I. Pump Thermostat
C8040-11977 F.I. Pump Thermostat Behr IN STOCK $33.05  
  
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1969 Mercedes Benz 280SL
Part: Thermo Time Switch
 Note:  for Cold Start Valve
C4010-12029 Thermo Time Switch VDO IN STOCK  $105.59  

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc...