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1981 Mercedes Benz 300sd cranks but won't start

Tiny
HIPPSAKAMO
  • MEMBER
  • 1981 MERCEDES BENZ 300SD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I purged the lined with the plunger, no effect. I have noticed that if a disconnect the fuel line in, rifgt at the plastic fuel pre-filter, no fuel is pumped. I do not hear the fuel pump with the key on or when the car cranks. Shoud I hear it? Fuel does seem to pump out of the injector pump though. I suspect the fuel pump. Am I missing anything?
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Saturday, August 22nd, 2009 AT 6:15 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
It does sound like the fuel pump is weak or bad. Here is a how to for checking it. Check it out and let me know what you find.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
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Saturday, August 22nd, 2009 AT 9:28 PM
Tiny
HIPPSAKAMO
  • MEMBER
  • 2 POSTS
Thanks, where is the fuel pump? CHILTON SAYS IT IS IN LINE, under the left pass floor panal, but I DON'T see it there. Is it in the fuel tank? In line next to the fuel tank?
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Sunday, August 23rd, 2009 AT 6:20 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I just tried liiking I up with our online repair manual and the info isn't available. I believe the Chilton manual is correct. I don't think it's in the tank on your model.
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Monday, August 24th, 2009 AT 3:00 PM

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