BenzWorld Junior Member
Date registered: Sep 2006
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280SE 1972 Fuel Damper, pump, system, Problem?
I let this car sit WAY too long and let the fuel turn to varnish. I am now paying the BIG price. I've replaced the fuel filter, the tank filter, the entire fuel line to the fuel damper, the fuel regulator, all of the hoses on the rails, and sent all of the fuel injectors to Washington to be cleaned. IT STILL DOESN'T WORK! UGH!!
I've unhooked one hose on the return end of one rail, and one hose at the regulator before going to the other rail. I think I hear the fuel pump initially come on, but then there must be too much pressure because when I got back to it with a multimeter and the car in the run position, I get no voltage. The fuel pump is getting fuel through the damper, but since that is the only part, other than the return hose that I did not replace, I'm wondering how to test the damper? Even though a decent amount of fuel is coming out of the damper when I pour it into a bottle, that may not be enough to make it through the new regulator. Since the Bosch regulator has white paint on the nut, I'm assuming they set it in the approximately correct position, and didn't totally close it. Right? I can see a couple of threads on the adjustment screw, so I don't think it is totally closed off. Any tips anyone can suggest?
As a secondary, ignorant novice, question how does the fuel system normally get enough back-up pressure so that fuel goes through the injectors and not just try to go back through the return lines on the rails? Is the return fuel line smaller?
In case anybody wants to know, if you need to get you injectors cleaned, the witchhunter.com site does a great, FAST, job!
Now, if I can just get this old Mercedes to start again.......