Author Topic: W111 1969 2.8 l fuel pump problem  (Read 3207 times)


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W111 1969 2.8 l fuel pump problem
« on: April 18, 2017, 21:56:31 »
Hi. My 1969 280se 2.8 cabrio long fuel pump has packed up.
Can anyone please advise as to where I could get the flow rate and pressure measurements for this pump. (or where I could get a replacement)
I am really struggling on both counts. Many thanks.


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Re: W111 1969 2.8 l fuel pump problem
« Reply #1 on: May 10, 2017, 23:56:05 »
i don't have the info you requested but
you should check the screen inside the pump, sometimes they get clogged
there's a fuel tank filter, fuel pump filter (inside intake nozzle)
, and fuel injector filter under the hood
Michael Parlato

Benz Dr.

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Re: W111 1969 2.8 l fuel pump problem
« Reply #2 on: May 11, 2017, 04:27:46 »
You need about 10 PSI and 1 liter in 15 seconds for the pump to be considered a good unit. Check fuel pressure at the CSV fitting and fuel volume after the fuel damper where the line runs back to the fuel tank. If all of these things check out, test the return fuel line running to the tank with compressed air to see if anything is blocked. Remove the gas cap first and put a rag around your air wand to prevent blow back into your face.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC