1976 Mercedes Benz 450sl the car is turning off once it war

Tiny
NORMAJ
  • MEMBER
  • 1976 MERCEDES BENZ 450SL
  • V8
  • FWD
  • AUTOMATIC
  • 117,000 MILES
I have this 1976 Mercedes-Benz 450sl. We bought it from some people who had it sitting under a tree for at least two years. We put a tune up on it and replaced the vacuum lines. We also put in a new fuel pump and filter. The problem is every time we start it it sounds good but once it warms up or we put it in reverse it turns off. It is also running a little rich as well. Can you give me an idea what this might be?
Sunday, July 11th, 2010 AT 3:48 PM

3 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Hello and thanks for donating

When it is first started, does it idle smooth and around 750 RPM? Is there any smoking coming from engine or exhaust when accelerating or idle? One more thing just to clarify, is this the diesel motor, fuel injected or carbureted?
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Tuesday, July 13th, 2010 AT 5:17 PM
Tiny
NORMAJ
  • MEMBER
  • 3 POSTS
Yes the car runs smooth with first started. It doesn't start to surge until about 175 degrees operating temperature. Then it surges and turns off. It will start back up. Runs good until it warms up. We did a complete tune up and replaced the fuel pump too. The car is fuel injected gas.

Thank you for your help,

Norma
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Sunday, July 18th, 2010 AT 1:26 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
It would seem as though this is fuel related. In the tune up, did you replace the fuel filter? Also test the fuel pump relay.
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Sunday, July 18th, 2010 AT 1:33 PM

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