This is probably because of modern fuel additives & the introduction of ethanol into fuel. Repair kit for a four cylinder alloy Bosch. This Repair Kit is suitable for the following Bosch Fuel Distributors numbers.
0438101002 Mercedes 190E, 200E, 230GE Repair Kit for Bosch Fuel Distributor
Vacuum Pump Repair Seal 6422300065 Repair Kit For Mercedes OM642 3.0L LA1231061
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Vacuum Pump Repair Seal 6422300065 Repair Kit For Mercedes OM642 3.0L US
Engine Timing Chain Kit Cam Phaser Repair Kit For Ford Expedition F-150 5.4L 3V
