Good morning gentlemen,
I could use your help figuring out why I’m not able to get any fuel into my 1987 SL560. It had been parked for years and when I got it home the first thing I needed to do was replace brake master cylinder. With that done tried to get the car running. I noticed that I could not hear the fuel pumps run and after testing them, I ended up replacing both fuel pumps and the fuel filter. I replaced the fuel relay also. I drained the fuel tank and ended up replacing the fuel tank outlet hose that was rotting a braking up as I tried to cut a piece away.
Now I had excellent fuel pressure, still no start.
I checked for and have good spark, when I used starting fluid the engine started immediately for a second or two.
Next step, I noticed that when I broke the connection between the fuel injectors and the fuel distributor that I was getting no fuel. When I cracked the EHA or fuel in line to the fuel distributor I had good pressure and copious fuel. I had read that the fuel distributor could gum up from the ethanol fuels and I ended up rebuilding the fuel distributor. The inside was pretty clean, but the diaphragm was starting to degrade. Anyway with that done I still am not getting any start.
I don’t know if the EHA is the correct term for the part on the fuel distributor, but it appears to be a electro hydro mechanical fuel shut off from what I have read. I applied 12 volts to the EHA and could hear a faint click like it was opening. With a small rubber hose I blew through the unit and it opened and let air through when I applied voltage, so I don’t think it is that. I have the KE-Jetronic fuel system.
I am trying to educate myself on the Bosch CIS system, and I believe with the cold start part of the system that the engine should start, at least try to start, as long as there is fuel to the system. If anyone can help me determine where the road block to the fuel is in my system, I would be greatly appreciative.
Things I have done so far:
• New Battery
• New fuel relay
• New fuel pumps
• New fuel filter
• New fuel tank exit hose
• Fuel distributor rebuild
Any help would be greatly appreciated.
Jeff