1971 250 Accelator Pump - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 06-22-2008, 05:53 PM Thread Starter
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Vehicle: 1971 250 1988 420SEL
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1971 250 Accelator Pump

Hey Guys
I have a 1971 Mercedes Benz 250 I need to change the accelator pump on the carburator, where is the accelator pump located and what is the (Zienth) carburator number?

Thanks for everyones help!

1991 420sel
1971 250 4DR
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post #2 of 4 (permalink) Old 06-22-2008, 06:16 PM
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post #3 of 4 (permalink) Old 06-22-2008, 06:25 PM Thread Starter
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Thank you!
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post #4 of 4 (permalink) Old 06-23-2008, 07:23 AM
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You might want...

also want to check out the accelerator pump injection nozzle in the throttle bore. These can plug up over time and produce a small "piddle" of fuel and not the steady stream required for enrichment on heavy acceleration. There is actually a tool for measuring the accelerator pump output at the nozzle, but I suspect one would be difficult to come by these days.

The part [nozzle] in question is #190 in the breakdown drawing above. Be careful changing this piece, if necessary, as dropping it down the bore will necessitate a rather time consuming process to remove it...

Good luck,

JR
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