This is probably because of modern fuel additives & the introduction of ethanol into fuel. Repair kit for a six (five) cylinder alloy Bosch. This Repair Kit is suitable for the following Bosch Fuel Distributors numbers.
0438101044 Repair Kit for Bosch Fuel Distributor fits 90-93 Mercedes 300SL R129
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
