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Old 09-02-2015, 07:29 PM
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Join Date: Aug 2010
Location: Bye Bye Michigan winters... Hello Florida Keys
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Surging at high RPM

My 1991 350SDL started surging at high RPM. By that I mean it starts surging around 3250 rpm and has a hard time building rpms beyond that point. It acts like it hits a rev limiter. It will but slowly and it doesn't like it.

It is not very often that I rev it that high but I had to merge on the highway yesterday and I noticed it.

I'm thinking that I'm running out of fuel.

I changed both of the fuel filters today and I didn't see much improvement if any.

Lift pump going??
Suggestions??

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Old 09-02-2015, 08:07 PM
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Location: Long Beach,CA
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If you believe it is a fuel supply issue you have a Fuel Tank Screen, a Fuel Pressure Relief/Overflow Valve and of course the Fuel Supply/Lift Pump.

There is 2 threads on rebuilding the type fo Fuel Supply/Lift Pump that you have. My notes are kind of messed up but I think this might be one of the threads.
606 Fuel/Lift Pump Rebuild
OM606 Fuel Pump Rebuild - PeachParts Mercedes ShopForum

Some of the Fuel Pressure Relief/Overflow are said to have a plastic piece inside of them that warps or fractures. There should be a ball bearing, the plastic piece and a spring inside.

Is the turbo boost pressure reaching the ALDA and is it the correct boost pressure?

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