A delay or pause before a toilet begins refilling after a flush is typically caused by a sticking float mechanism, a slow-reacting diaphragm seal inside the fill valve, or low incoming water pressure. When the flush handle is pulled, the float may hesitate before dropping down to trigger the valve open. Furthermore, sediment in the supply line can restrict the initial surge of water pressure. Verification: Observe the float arm immediately after flushing to ensure it drops instantly and opens the valve without hesitation.
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