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Old 04-19-2003, 06:23 PM
Michael Stoic Michael Stoic is offline
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Join Date: Apr 2003
Location: Boston, MA - USA
Posts: 17
How to Clean a CIS K-Jet Fuel Distributor

1979 450SLC M117.985

Is it possible to flush the Fuel Distributor from sediments and contamination in the upper chambers?

My mechanic had detected contaminated fuel emerging from the FD injector lines (while diagnosing a no-start condition) and there had been other performance degradation prior to the car being parked for a few months.

In any event, fuel pressure tests rule out both the fuel pump and the control pressure regulator (warm-up regulator) and point to some likely fuel flow restriction in the FD and the Injectors.

I am wondering if the FD can be cleaned by emersion in a cleaner (like the Yamaha carb cleaner - designed NOT to react with rubber and plastic) or by another method?

Can the FD be power flushed on the bench? I know (I think) one method is to leave the FD on the car and flush it by energizing the FP and releasing the injector line fittings while keeping the air flow meter air sensor plate down, but would like to get input on which method is best/possible/recommended...

Many thanks for your input!
Michael Stoic

1979 450SLC
1989 300SE
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