eAuto · Trusted by Mechanics. Built for Riders. eAuto Fuel Pump Assembly for Yamaha FZ-S V3 BS4 (Early 2019) | 149cc Air-Cooled FI The eAuto fuel pump assembly covers the Yamaha FZ-S V3 BS4 — the brief transitional version launched in early 2019 before the full BS6 switchover in November 2019. The FZ-S V3 BS4 updated the styling and chassis over the V2 but introduced a new fuel tank and pump module (OEM: B4G-E3907-00), distinct from both the V2 (2GS) and the BS6 V3 (B9P). This was a short production window — January to October 2019 — but these bikes are still on Indian roads. Every unit is tested for correct fuel pressure output and electrical function before dispatch from eAuto.co.in. eAuto Key Specs: 149cc Air-Cooled FI | FZ-S V3 BS4 | Jan–Oct 2019 Only | OEM Ref: B4G-E3907-00 ✅ eAuto Verified Fitment — Fits These Models Model Year Range Engine Yamaha FZ-S V3 BS4 Jan 2019–Oct 2019 149cc, Air-Cooled, SOHC, 2-Valve, FI, BS4, 5-Speed ⚠ How to identify if you have a BS4 V3: The FZ-S V3 was sold in BS4 form from January 2019 to October 2019. If your bike was purchased in this window, it is a BS4 V3. Bikes purchased from November 2019 onwards are BS6 models — for those, see the eAuto FZ V3 BS6 listing. ⚠ Does NOT Fit — Do Not Order For These Models Model Reason Yamaha FZ FI V2 / FZ-S FI V2 / FAZER FI V2 (2014–2018) V2 platform uses a different pump (OEM: 2GS-E3907-00) — eAuto makes a separate assembly Yamaha FZ V3 BS6 / FZ-S V3 BS6 (Nov 2019–Present) BS6 platform uses a different pump (OEM: B9P-E3907-00) — eAuto makes a separate assembly Yamaha FZ-X (2021–Present) FZ-X uses the BS6 pump (B9P) — not compatible with this BS4 assembly Yamaha FZ 25 / FZ 250 / FAZER 250 (249cc) Completely different 249cc engine — separate fuel pump Technical Specifications Brand eAuto — Trusted by Mechanics. Built for Riders. Manufacturer OES — Quality aftermarket fuel pump manufacturer trusted by mechanics across India Part Type Fuel Pump Assembly — Complete In-Tank Module (फ्यूल पंप असेंबली / ईंधन पंप असेंबली) Compatible Models Yamaha FZ-S V3 BS4 (Jan–Oct 2019 only) OEM Reference B4G-E3907-00 Engine 149cc, Air-Cooled, SOHC, 2-Valve, Single-Cylinder, Fuel-Injected, BS4 Transmission 5-Speed Manual Year Range Jan 2019–Oct 2019 only Emission Standard BS4 Fuel Pressure Output ~2.5–3.0 kgf/cm² Operating Voltage 12V DC Package Contents 1 × Fuel Pump Assembly (complete in-tank module with strainer and float) Material Metal + PVC Weight ~1 kg Quality Standard eAuto tested — fuel pressure output and electrical function verified before dispatch Sold By eAuto.co.in — Trusted by Mechanics. Built for Riders. Package Contents 1 Set × eAuto Fuel Pump Assembly for Yamaha FZ-S V3 BS4 (Jan–Oct 2019) ⚠️ When to Replace FZ-S V3 BS4 bikes are now 6 years old and entering the replacement window. The symptoms are the same as any FI fuel pump failure: No priming buzz on ignition — Turn the key and listen for ~2 seconds of pump pre-pressurisation. No buzz means pump motor failure. Hard cold starts — Multiple cranks needed before the engine fires on cold mornings. Stalling at low fuel levels — Clogged strainer causing stalling at idle when the tank is nearly empty. Throttle hesitation — Brief stutter when opening the throttle from standstill. FI warning light — Low fuel pressure ECU fault code illuminates the FI warning indicator. Installation Notes Identify your variant first: Confirm your bike was purchased between January and October 2019. If purchased from November 2019 onwards, your bike is a BS6 model requiring a different pump — see the eAuto FZ V3 BS6 listing. Tank Access: Full tank removal is required. Depressurise the fuel system by running the engine until it stalls before disconnecting any
