Hi, most likely front lip seal on Bosch injector pump. Have replaced 2 in 454 with D179 which is 3 cyl version of D239. Unfortunately you have to remove the pump to replace the seal. Be sure to mark exact location of pump on the mounting flange before loosening any mounting bolts. DO NOT loosen cap screws on pump drive gear. You only have to remove big nut on pump drive shaft via the access hole in the front of the pump drive gear cover. DO NOT rotate pump drive shaft when you have it removed, if you do rotate drive shaft then rotate it 2 revs in direction of travel.
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