🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Vapour lock in hot weather — engine cutting out
💰 Estimated Repair Cost
$20 – $80 USD
Parts and labour estimate
🔧 Tools Required
Wrapping tools
📋 Overview
In very hot weather, fuel in the carburetors and lines can vapourise before reaching the engine. The engine cuts out and will not restart when hot, but starts after a 20-minute cool-down.
🩺 Symptoms
- Engine cuts out after sustained hard driving in hot weather
- will not restart when hot
- restarts after 20-30 minutes
🔍 Possible Causes
- Fuel vapourisation in fuel lines or carburetor
- insufficient heat shielding
- blocked fuel return
🛠️ Diagnosis Steps
Note conditions when fault occurs — always in hot weather after sustained running.
✅ Most Confirmed Fix
Wrap fuel lines with heat insulation. Ensure fuel return line is clear.
68% of users confirm this fix worked (14 reports)
🏷️ Parts Needed
Heat insulation wrap for fuel lines; fuel return line
🔗 Other Mercedes-Benz W115 Faults
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