Hyundai 31910-21000 Fuel Filter

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Although it's not a regularly scheduled maintenance item, occasionally cleaning the in-tank fuel filter will prevent it from becoming clogged. You can also use this procedure anytime you need to drain the fuel tank (for example, before you remove it). Since you will be draining the fuel tank in this procedure, make sure the tank is nearly empty before beginning. Disconnect the cable from the negative terminal of the battery. Raise the rear of the vehicle and support it securely on jackstands. Place blocks in front of the front wheels. Place an approved gasoline container under the drain plug. Unscrew the plug and pull it straight down so it will clear the fuel tank outlet pipe. Thoroughly clean the filter with a brush and solvent. If the filter is damaged, replace it by pulling the old filter out of the drain plug and pressing in the new filter until its claws fit snugly into the locking holes in the plug. Carefully slide the filter up over the fuel tank outlet pipe and tighten the drain plug securely. Use a funnel to pour the drained fuel back into the fuel tank. Reconnect the negative battery terminal.