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.
For GM 2771004 / KIT-501 Hydroboost Repair Rebuild Kit Complete Seal Kit Set
GM THROTTLE BODY TBI TWIN INJECTOR POD REPAIR REBUILD KIT INCLUDES GASKET SEALS
Upgrade Turbo Repair Rebuild Kit for Cummins 6.7 Holset HE351VE Turbo 2881708RX
Carburetor Major Repair Rebuild Kit For Model A & AA Base 1928 1929 1930 1931
Carburetor Repair Rebuild Kit For Mercruiser Mercury Marine 3.0L 4.3L 5.0L 5.7L
IMPCO STYLE RK-E-2 PRESSURE REGULATOR REPAIR REBUILD KIT MODEL EB-2 CONVERTER
