[W126 Coupe] Fuel Problem

[Dan Stratton]

I'm dealing with a problem on a '87 420SEL (I know it's not a coupe)  
running rich. This car has been in my family since new and not driven  
very much at all (it has about 22,000 actual miles). Of course after  
sitting and the gas going bad in the tank, we've had a problem. About  
every other time we run it something sticks in the fuel system and we  
get black smoke out the tail pipe and very poor fuel mileage. We have  
drained all the gas and refilled with fresh -added Seafoam (fuel  
additive/cleaner). I've checked the following:

Cold start device
Fuel Pressure regulator
Oxygen sensor
unplugged throttle sensor & what ever that other device on the left  
side of the fuel distributer is (EMH FFC ?!?)
Ignition, plugs etc.

When I put a meter on it, the value jumps between 50 - 0. All I can  
guess is something is sticking in the fuel distributer, but I've ran a  
couple of tanks of gas and fuel conditioner through it and still no  
luck. I'd like to get this resolved for my father (he is pestering me  
to fix it), but I suggested he NOT take it to the local dealer. The  
problem comes and goes. Any one ever have a similar problem on a car  
that has sat without being driven?

Dan

___________________________________________________________
'87 560SEC   '58 300d   '59 220S CabrIolet   '58 220S Sunroof   and  
others...
stratton at illustration.com