🚗 Classic Fault — Mercedes-Benz (1976–1985)
W123 200 M115 carburettor float level fault
💰 Estimated Repair Cost
$15 – $60 GBP
Parts and labour estimate
🔧 Tools Required
Vernier caliper, carb rebuild kit
📋 Overview
The Solex carburettor float and needle valve on the 200 model wears and allows incorrect fuel levels.
🩺 Symptoms
- Black sooty plugs
- fuel smell
- rich running
- rough idle
- occasional flooding
🔍 Possible Causes
- Worn float needle valve
- punctured float
- incorrect float height
🛠️ Diagnosis Steps
Remove carb top and check float height with vernier — compare to Solex spec. Check needle valve seating
✅ Most Confirmed Fix
Float and needle valve replacement
87% of users confirm this fix worked (23 reports)
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