Yamaha YZF-R125 Fuel Pump Removal & Replacement

Yamaha YZF R125 for sale on Ebay UK

Yamaha YZF R125 parts for sale on Ebay UK

Gemini said

⚠️ Safety Warning: Working on the fuel system involves flammable vapors. Work in a well-ventilated area, away from naked flames or sparks, and ensure the engine is cold. Keep a fire extinguisher nearby and wear protective gloves and eyewear to avoid fuel contact.

The fuel pump is located inside the tank and is responsible for delivering pressurized fuel to the injector. If your bike is struggling to start, cutting out at high RPMs, or you can’t hear the "prime" whistle when you turn the key, the pump or internal filter may be failing.

Tools Needed

• 10mm spanner or socket

• Flat-head screwdriver

• Torque wrench (recommended)

Step-by-Step Removal

1. Drain the Tank: It is much easier and safer to perform this task with as little fuel in the tank as possible.

2. Undo Retaining Bolts: Use a 10mm spanner to remove the nuts holding the fuel pump assembly to the bottom of the tank.

3. Careful Extraction: Gently pull the pump assembly out. Caution: Be extremely careful not to bend the float arm or damage the fuel level sensor as you maneuver it through the opening.

4. Internal Disconnection: Once out, disconnect the two power cables leading to the pump motor.

5. Accessing the Motor: Use a screwdriver to carefully pry the plastic housing tabs. You can then slip the housing apart to access the pump motor and pull it free.

6. Filter Maintenance: While the assembly is apart, check the fuel filter at the base of the pump. If it's dark or clogged, replace it now to prevent future pressure issues.

Refitting Tips

• Reverse Order: Reassemble the housing, ensuring the electrical connectors align perfectly.

• Torque Pattern: Tighten the 10mm nuts in a "criss-cross" pattern, a little at a time, to ensure even pressure on the gasket.

• Final Torque: Tighten each nut to 4Nm. Do not over-tighten, as you may snap the studs or crush the seal.

Shop Parts

• Fuel Pumps: Buy Yamaha R125 Fuel Pumps & Motors on eBay UK

• Filters: Yamaha R125 Fuel Filter Kits on eBay UK

Easy job all you need is a 10mm spanner and a screwdriver .

if you need a new pump or pump motor then try here on Ebay UK 

 fuel pump removal refitting - fuel pump motor replacement 

undo the 10mm retaining bolts 

becareful of the float and lever arm when removing from tank

disconnect the 2 power cables to the pump 

to do this you need to insert screwdriver where i show below

you now have to slip the plastic housing to access the pumps location and pull free from housing

to replace fuel filter remove via below connector

refit i  reverse order and make sure wire connector aligns properly 

slowly and a little at a time do each nut in turn until it goes tight and continue 

until 4nm torque has been reached on each nut .