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.
0438101003 Repair Kit for Bosch Fuel Distributor Mercedes 190E 2.3 W201
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
