🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Blocked fuel filter causing lean misfire under load
💰 Estimated Repair Cost
$5 – $15 USD
Parts and labour estimate
🔧 Tools Required
Bucket, rag, hose clamp
📋 Overview
An original or long-life fuel filter that has not been replaced restricts fuel flow to the carburetors at higher RPM and under load, causing lean misfiring.
🩺 Symptoms
- Misfiring under load
- engine clears at idle
- surging on hills
- worse when fuel level low
🔍 Possible Causes
- Blocked inline fuel filter
- partially blocked in-tank filter mesh
🛠️ Diagnosis Steps
Check fuel filter visually. Test flow by disconnecting outlet side — gravity flow should be strong.
✅ Most Confirmed Fix
Replace fuel filter. Check in-tank mesh strainer on fuel tap.
92% of users confirm this fix worked (55 reports)
🏷️ Parts Needed
Inline fuel filter
🔗 Other Mercedes-Benz W115 Faults
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