Home / Lawn & Garden / Parts / Lawn Mower Fuel Cap 504031801 Lawn Mower Fuel Cap 504031801$8.29 Price may not be up-to-date. In Stock View Product Part Number: 504031801 Brand: POULAN/WEEDEATER Seller: Sears PartsDirect Categories: Lawn & Garden, Parts 60-day return policy Description This fuel cap (part number 504031801) is for lawn mowers. Fuel cap 504031801 screws onto the fuel tank to prevent fuel from spilling. Follow the instructions in the owner’s manual when replacing this part.