So I touched briefly on this in an earlier thread but I think it warrants a specific post... The FI pump on my early 230sl has developed an oil leak - a big one. This is the early unit with a sealed oil reservoir for the piston oill. The strange thing is that it is clearly motor oil from the crankcase that is getting into the unit and overflowing (out of the dipstick tube, I can open the dipstick and get several ounces to flow out, then suck more out, then drive a few times and open dipstick and get several more ounces out). I see an oil feed tube going into the FI pump - what is is the purpose of this and where is the seal that is supposed to keep engine oil out of the pump or atleast out of the the pump reservoir? This pump was rebuilt 8 years ago about run very little and intermittently until recently so a seal may have dried up, I'm just trying to understand how it works and I can't find this covered in the FI pump tour. Thanks!
