Fuel Filter 149-2457 Fuel Pump 149-2311 Air Filter 140-3280 for Onan Cummins Generator 4000 4KW Microlite MicroQuiet Camp Power KYD Camp Power/QG RV

Product Specifications

Compatible Models

Tired of Generator Downtime? Get the Right 149-2457 Fuel Filter, 149-2311 Fuel Pump & 140-3280 Air Filter for Onan KY 4000

RV owners and fleet operators know: a single failed fuel pump or clogged air filter can shut down an Onan KY 4000 generator for days — halting refrigeration, lighting, and life-support systems. OEM parts often take 2–4 weeks to arrive and cost 30–50% more. Worse, counterfeit filters lack proper filtration media, letting contaminants damage fuel injectors and shorten engine life by 1.5×.

OEM-Equivalent Quality, Ready to Ship

XUNPO supplies this Onan KY 4000 replacement kit from ISO-certified factories with 10+ years of generator component experience. Each 149-2457 fuel filter, 149-2311 fuel pump, and 140-3280 air filter undergoes pre-shipment performance testing — including flow rate verification for the pump and micron rating validation for both filters. Designed for real-world use in RVs, mobile clinics, and remote construction sites where reliability is non-negotiable.

Where This Part Works

This kit supports critical power generation in environments where clean fuel and consistent airflow directly impact runtime and stability — from desert RV parks with high dust loads, to coastal marinas with salt-laden air, to emergency response vehicles operating under continuous load. In these conditions, a low-efficiency air filter or inconsistent fuel delivery causes voltage fluctuation, hard starting, and premature wear on the KY 4000’s 4KW alternator assembly.

Engineering Details That Matter

The 149-2457 fuel filter uses multi-layer cellulose-synthetic blend media rated at 10 microns absolute, meeting SAE J1852 standards for diesel/gasoline compatibility and water separation. The 149-2311 fuel pump features precision-machined brass internals and a 12V DC diaphragm rated for 4–6 PSI output — matching OEM pressure curves across temperature ranges from -20°C to +60°C. The 140-3280 air filter employs oiled cotton gauze with reinforced molded rubber sealing flange, ensuring zero bypass even after 100+ hours of vibration-heavy operation. All dimensions match original equipment within ±0.15 mm tolerance for direct bolt-on installation.

The Real Cost of Wrong Parts

A $12 counterfeit fuel filter may save money upfront — but it fails to meet ISO 4020 filtration efficiency, allowing particles >15 microns into the carburetor. That leads to clogged jets, misfires, and eventual throttle body replacement ($180+ labor). A substandard 149-2311 fuel pump with weak diaphragm material drops pressure below 3.5 PSI under load, causing stalling during AC compressor startup — triggering repeated service calls. Total cost of ownership (TCO) rises sharply: downtime, labor, secondary damage, and lost productivity far exceed the 15–20% premium for XUNPO’s tested, warrantied Onan KY 4000 parts.

Why Customers Trust XUNPO

Packaging & Shipping

• Each component individually sealed in anti-static, moisture-resistant pouches; final kit packed in rigid corrugated box with custom foam inserts
• In-stock items shipped within 2–5 working days after payment confirmation
• Flexible logistics: Express (DHL/FedEx/UPS), air freight, or sea freight — selected per customer requirement
• Real-time tracking number provided upon dispatch, updated until door delivery
• Minimum order quantity: 1 set — supports urgent field repairs and small-fleet maintenance

Get Your Onan KY 4000 Replacement Kit Now

Your generator shouldn’t wait weeks for parts. Send us “149-2457, 149-2311, 140-3280”, your machine model (e.g., KY 4000), and required quantity — we’ll email a competitive quote within 24 hours. First-time buyers may request sample testing. Stock ships fast: every hour delayed costs uptime and revenue.

Frequently Asked Questions