🚗 Classic Fault — Mercedes-Benz (1968–1976)
W114 Zenith carburetor needle valve flooding
💰 Estimated Repair Cost
$15 – $50 USD
Parts and labour estimate
🔧 Tools Required
Screwdrivers, carburetor jet tool, float level gauge
📋 Overview
The needle valve in the Zenith carburetor float chamber fails to seat correctly, allowing fuel to overflow into the intake manifold and potentially cause fire.
🩺 Symptoms
Strong petrol smell. Engine floods and refuses to start. Fuel leaking from carburetor overflow tube.
🔍 Possible Causes
Worn needle valve tip. Perforated float. Debris on valve seat.
🛠️ Diagnosis Steps
Remove air filter. Check for fuel in throat of carburetor. Remove float bowl and inspect needle valve seat.
✅ Most Confirmed Fix
Replace needle valve and seat kit. Set float level to specification. Replace float if perforated.
78% of users confirm this fix worked (18 reports)
🔗 Other Mercedes-Benz Faults
Own a Mercedes-Benz ?
Share your experience with this fault — or report a different issue. Your knowledge helps other classic car owners worldwide.