On a fuel-injected (EFI) motorcycle the fuel pump motor lives inside the tank and delivers pressurised petrol to the injector. When it weakens, the bike cranks but will not fire, stumbles at high rpm, or dies without warning. This guide shows you how to diagnose and buy the correct pump.
1. Prime sound and no-start diagnosis
A healthy EFI pump gives a brief whir when you switch on the ignition. Silence, a weak buzz, or a whine that changes pitch points to a tired motor. Before buying, confirm the kill switch, side-stand switch, battery voltage, and fuel level, and check the pump fuse and relay.
2. In-tank assembly vs bare motor
Some listings are the complete in-tank fuel pump assembly (motor, housing, strainer, pressure regulator, level sender). Others are the bare pump motor only. If the housing, strainer, or sender is also tired, the complete assembly is the smarter buy.
3. Match the model, engine and BS version
Pump pressure, flow, and connector differ between models and emission versions. A Hero Glamour BS6 pump is not the same as a BS4 unit. Always match the exact model, engine displacement, and BS version, and note whether the bike is EFI at all.
4. Pressure and flow matter
EFI systems run at a specific rail pressure (commonly around 2.5 to 3.5 bar). A pump that delivers too little causes lean running and hard starting; too much overwhelms the regulator. Buy an OEM-spec pump rated for your system rather than a generic high-flow unit.
5. Symptoms of a failing fuel pump
Long cranking before it fires, loss of power under load, surging, random stalling, and a pump that is noisy or gets hot are classic signs. A clogged strainer or filter mimics all of them, so clean or replace the filter first.
6. Fitting tips
Work with a near-empty tank, release fuel pressure safely, and fit a new tank gasket or O-ring. Keep the tank area spotless so no debris enters the new pump, and check for leaks at the outlet before riding.
Bottom line
Match the model, BS version, and system, replace the strainer and gasket, and confirm the fuse, relay, and battery first. That fixes most EFI no-start faults without guesswork.
Bike Model Fitment
| Bike Model | Year | Fits |
|---|---|---|
| Hero (Glamour BS6, Passion Pro BS6, Maestro Edge 110/125 BS6) | 2017-present | Yes |
| TVS (Apache RR 310, also BMW G310R/GS/RR) | 2017-present | Yes |
| Aprilia (SXR 160 BS6, SXR 125 BS6) | 2020-present | Yes |
| Bajaj (Pulsar 150/220 EFI, Dominar 400) | 2010-present | Yes |
| Yamaha (FZ, R15 EFI models) | 2010-present | Yes |
Quick Mechanic Diagnostic Checklist
- Confirm the bike is fuel-injected (EFI)
- Listen for the ignition prime whir
- Check the pump fuse, relay, battery, and switches
- Decide between a bare pump motor and a complete in-tank assembly
- Match the exact model and BS version (BS4/BS6)
- Replace the strainer/filter and tank gasket
- Work with a near-empty tank and keep it clean
Frequently Asked Questions
How do I know if my fuel pump is failing?
Common signs are long cranking before it starts, loss of power under load, surging, random stalling, and a pump that is noisy or silent at ignition-on. Test the fuse, relay, and battery first.
Should I buy a complete fuel pump assembly or just the motor?
If the housing, strainer, regulator or level sender is also worn, a complete in-tank assembly is the better value. Buy the bare motor only when the rest of the assembly is healthy.
Does the BS version matter when choosing a fuel pump?
Yes. Pump pressure, flow and connectors differ between BS4 and BS6 models, so match the exact model and emission version.
Can a clogged filter cause the same symptoms as a bad pump?
Yes, and it is cheaper to fix. A blocked strainer or filter restricts fuel flow and mimics a weak pump. Clean or replace the filter before condemning the pump.
Are these fuel pumps genuine OEM spec?
They are OEM-spec EFI fuel pump motors and assemblies rated for the original system pressure and connector. The listing names the exact models covered.