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1980 Mercedes 450SLC

Artur1973
Sat, 23 Mar 2019 13:01:26 GMT

Hi, I have a problem with starting the car when it's warm, when it's cold it starts off right away. some idea what I could check. Thx Artur

seip
Sun, 29 Sep 2019 02:09:36 GMT

Arthur, did you find a solution??

seip
Sun, 13 Oct 2019 14:26:59 GMT

my 1973 450 sl does the same thing. hmmm

Claude Bennett
Sat, 19 Oct 2019 00:01:10 GMT

you need you replace the fuel pressure compensater reservoir its located next to the fuel pump & filter.I had the same problem. cause you need to have 100 lbs of pressure. when cold, the cold start injector spray a lot of fuel so it will start.

seip
Sat, 19 Oct 2019 23:23:17 GMT

thanks Claude I will try it. will keep u posted.

seip
Thu, 24 Oct 2019 20:08:34 GMT

Claude, my mechanic is saying that my 450sl 1973 does not have fuel pressure sensor system

Claude Bennett
Fri, 25 Oct 2019 23:50:36 GMT

first of all Iam not talking about fuel pressure sensor. It is a fuel accumulator made by bosch PN 0438170004. my parts supplyer is AUTOHAUS AZ. and they say you have this part and it could be the problem you have starting, mine was bad and it starts OK now.

seip
Sat, 26 Oct 2019 13:57:47 GMT

thks

seip
Fri, 01 Nov 2019 21:13:50 GMT

claude. hope u r well. keeping you posted. my 450sl 1973 is a California model or system. it does not have a fuel accumulator. I have a photo if you prefer. I lived up north and never had this issue, once I moved to miami it started. I m still trying to find a cure. John

Claude Bennett
Fri, 01 Nov 2019 21:35:26 GMT

so what do you have,did you look at the fuel pump and fuel filter that is located under the car next to the fuel tank.

190Efan
Fri, 01 Nov 2019 21:44:42 GMT

You might want to check with members of the South Florida section of MBCA to see if anyone there has had a similar problem and what their remedy for it was. This also might not be a fuel issue since temperature seems to be playing a role. I would think it would be a more consistent problem if it was just fuel. I used to live in Miami so I know that the air there is much more humid than the air in the other places you've lived. Can't say I ever had such a problem when I lived there. Hopefully someone in Miami will either have had the problem or can direct you to a place to have the problem diagnosed and solved. There are several MB dealerships in the Miami area depending on where in the area you're located. I bought my MB from MB of Coral Gables. Was a very good MB dealership when I was there.

seip
Sat, 02 Nov 2019 02:14:30 GMT

yes we checked out fuel pump and filter. my quest continues. I ll keep you guys posted.

Claude Bennett
Sat, 02 Nov 2019 03:29:07 GMT

OK,thank you

GaryEdwards
Wed, 11 Mar 2020 02:51:44 GMT

I believe that's a CIS injection system. Fuel pressure is modulated by a warm-up regulator to facilitate cold start and when warm it goes to the normal running pressure. Many things can go wrong here, and you really need to get a set of gages for this system and hook them up to monitor what's going on with fuel pressure.