hello guys, I am new in the club but always on MB 
I bought last summer a beautiful w124 2.5 diesel non-turbo manual from 1994 with om605.
a few weeks ago had ward start, especially when was cold, took about 8-10 sec, last few days after 2-3 tries and now she is dead.
sent to mechanic, he checks most of things and told me it should be an electric problem, he called an electrician he checked again but didn't find anything wrong. but still the fuel pump not supply diesel at all.
we change the fuel pump relay and the overvoltage, still the same.
he tried to connect the fuel pump straight to the battery but the pressure was very low.
also, I discover allot of water inside in the car, especially mats was completely wet, we check the seals underneath but everything looks fine, doesn't have a sunroof.
another thing, the previous owner used it with veg oil but microfiltered so don't know if this really matters.
any suggestion about it? also can I fit a mechanical fuel pump to solve this issue?
thanks

I bought last summer a beautiful w124 2.5 diesel non-turbo manual from 1994 with om605.
a few weeks ago had ward start, especially when was cold, took about 8-10 sec, last few days after 2-3 tries and now she is dead.
sent to mechanic, he checks most of things and told me it should be an electric problem, he called an electrician he checked again but didn't find anything wrong. but still the fuel pump not supply diesel at all.
we change the fuel pump relay and the overvoltage, still the same.
he tried to connect the fuel pump straight to the battery but the pressure was very low.
also, I discover allot of water inside in the car, especially mats was completely wet, we check the seals underneath but everything looks fine, doesn't have a sunroof.
another thing, the previous owner used it with veg oil but microfiltered so don't know if this really matters.
any suggestion about it? also can I fit a mechanical fuel pump to solve this issue?
thanks