What does an ATV accelerator pump cover do?

It’s a carburetor component for carbureted ATVs with accelerator pumps (e.g., Keihin FCR), replacing worn stock covers to improve fuel delivery, sharpen throttle response, and prevent leaks.

How should I choose a pump cover for off-road ATV riding?

Pick a model-specific cover that increases pump chamber capacity and improves spray pattern (some use multi-hole designs) to cut hesitation on rough terrain, and ensure it matches your carb type.

Will installing a performance pump cover require rejetting?

Most deliver better response without rejetting, though fine-tuning your carb settings can maximize gains.

What parts and materials are commonly included with these covers?

Many come with rebuild items like new diaphragms, springs, O-rings, and D-rings plus stainless hardware; install the D-ring with the flat side toward the cover and the rounded side toward the carb body.

What installation and maintenance tips apply for ATVs?

Replace if you notice flattened O-rings, cracked diaphragms, hesitation, or fuel leaks; use basic hand tools, wear eye/hand protection, and clean passages and check valves to prevent gumming during reassembly.