How to Replace a Riding Lawn Mower Fuel Pump

 

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This step-by-step repair guide explains how to replace the fuel pump on a riding lawn mower. The fuel pump moves fuel from the fuel tank to the carburetor. If the fuel pump is clogged or broken, the engine either dies quickly or just won't start. Replace a broken or clogged fuel pump with the manufacturer-approved replacement part.

Use this guide to replace the fuel pump on common Briggs & Stratton engines that power Craftsman, Husqvarna, Snapper, MTD, Yard-Man, Murray, Weed Eater, Toro, Troybilt and Ariens riding lawn mowers and lawn tractors.

Repair difficulty:
     
Time required:

Less than 30 min.

Parts Required

  • Fuel pump kit

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • 3/8" wrench
  • Drain pan
  • Needle-nose pliers
  • Safety glasses
  • Work gloves
  • Shop rags

Before you begin

Move the tractor to a well-ventilated area. Outside on a driveway is best. 

Wear safety glasses and work gloves.

Instructions

 Warning: Undertaking repairs to lawn equipment can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Step 1: Position the drain pan

Place a drain pan under the fuel pump to catch any gasoline spills. 

Step 2: Release the clamps

Use needle-nose pliers to release the clamps that secure the fuel lines to the fuel pump. 

Step 3: Transfer the lines

Disconnect the fuel supply line that runs from the fuel tank to the fuel pump, elevating the pump to prevent fuel from spilling. Keep the pump elevated as you connect the fuel supply line to the new pump and secure the line with the clamp.

With the pump still elevated, transfer the other fuel lines to the new pump and secure them with the clamps.

 Tip: If there's not enough slack in the lines to transfer the lines individually, remove all the lines, clamping the line attached to the fuel tank above the level of the tank to so the gas won't leak. Then remove the old pump and connect the new pump.

Step 4: Detach the existing pump

Use a 3/8" wrench to remove the fuel pump mounting bolt and then remove the pump from the lawn tractor.

Step 5: Attach the new fuel pump

Position the new fuel pump and attach it with the mounting bolts.

Step 6: Check for leaks

Start the engine and check for fuel leaks around the fuel pump.