---
title: "onan 4000 fuel pump — Niche Verdict: Worth a look (62/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/onan-4000-fuel-pump"
last_updated: "2026-07-14T06:16:36.945Z"
locale: en
meta:
  description: "onan 4000 fuel pump shows a sweet-spot price point ($38.57 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:description": "onan 4000 fuel pump shows a sweet-spot price point ($38.57 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:title": "onan 4000 fuel pump — Niche Verdict: Worth a look (62/100) | Amazon United States - Flapen"
---

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# **onan 4000 fuel pump**

**Worth a look**

Shows a sweet-spot price point ($38.57 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 18Growth 69Conversion 74Competition 45Returns 88Price range 85Avg price 95Brand share 64Review moat 90Quality gap 60

**Avg price**

**Incredible****$38.57**

avg listing price — sweet spot $15–$100

**Review moat**

**Great****209.55**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Great****1.4%**

return rate — above 6% kills the launch gate

**Price range**

**Great****$13.74–$110.79**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Conversion**

**Good****6.9%**

search→purchase rate — share of searches ending in a sale

**Growth**

**Good****+50.7%**

90-day search growth — must beat 0% to launch

**Brand share**

**Good****67%**

top-5 brand share — brands hold most of the demand

**Quality gap**

**Good****4.4★**

avg incumbent rating — lower means beatable quality

**Competition**

**Okay****58%**

top-5 click share — leaders hold, buyers still browse

**Market size**

**Bad****$70K**

$70K/yr · 26K searches

## **Competition**

The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**18 **▼falling

**Sellers**

**58**

**Top-5 brand share**

**67%**

**Open market**

**29%**

- GPS30% - partszen22% - RARAYC6% - CNRAQR5% - Podoy4% - Aspaton4%

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$7K20%$14K30%$21K40%$28K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 22 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![partszen 149-2311 Fuel Pump with 149-2457 Fuel Filter Tune Up Kit for Onan Cummins Generator 4000 4KW Microlite MicroQuiet Generators Parts with 1403280 Air Filter](https://m.media-amazon.com/images/I/418L3CZ1MoL.jpg)**partszen 149-2311 Fuel Pump with 149-2457 Fuel Filter Tune Up Kit for Onan Cummins Generator 4000 4KW Microlite MicroQuiet Generators Parts with 1403280 Air Filter**partszen**$34.39**4.1★404 rev](https://www.amazon.com/dp/B09HHD9WCD) [2![GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV Generator Model KY 4000 with ONAMAX 15W40 oil for use with Spec A - N](https://m.media-amazon.com/images/I/411SfNfXbXL.jpg)**GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV Generator Model KY 4000 with ONAMAX 15W40 oil for use with Spec A - N**GPS**$102.94**4.8★71 rev](https://www.amazon.com/dp/B0998243T2) [3![GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Cummins Onan RV Generator Model KY 4000 with ONAMAX 10W30 oil for use with Spec P - R](https://m.media-amazon.com/images/I/51SmCarsO2L.jpg)**GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Cummins Onan RV Generator Model KY 4000 with ONAMAX 10W30 oil for use with Spec P - R**GPS**$110.79**4.7★224 rev](https://www.amazon.com/dp/B096HYZ7DQ) [4![GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV generator model KY 4000 Spec A-R](https://m.media-amazon.com/images/I/41H5NR2q5bL.jpg)**GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV generator model KY 4000 Spec A-R**GPS**$69.50**4.7★615 rev](https://www.amazon.com/dp/B07884TLCK) [5![RARAYC 149-2311 Electric Fuel Pump and 149-2457 Fuel Filter Compatible with Onan Cummins RV 4000 4KW Microlite MicroQuiet Generator Parts](https://m.media-amazon.com/images/I/41oW9+cLuSL.jpg)**RARAYC 149-2311 Electric Fuel Pump and 149-2457 Fuel Filter Compatible with Onan Cummins RV 4000 4KW Microlite MicroQuiet Generator Parts**RARAYC**$29.80**4.3★23 rev](https://www.amazon.com/dp/B0DGS8SMFG)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![KAKATHU 149-2311 Fuel Pump Tune Up Kit with 149-2457 Fuel Filter & 1403280 Air Filter Compatible with Cummins Onan 3600W & 4000W MicroQuiet Microlite KY Series Gas RV Generator Replace # E11007](https://m.media-amazon.com/images/I/518+bS-bSaL.jpg)**KAKATHU 149-2311 Fuel Pump Tune Up Kit with 149-2457 Fuel Filter & 1403280 Air Filter Compatible with Cummins Onan 3600W & 4000W MicroQuiet Microlite KY Series Gas RV Generator Replace # E11007**KAKATHU**$27.42**2 rev5mo ago](https://www.amazon.com/dp/B0GKMV9LJ9) [![146-0785 Carburetor for Onan Cummins Generator 4000-Watt A042P619 A041D736 Carb with Tune-Up Kit Replaces for Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KY26100R (Carb with Tune Up Kit)](https://m.media-amazon.com/images/I/51VSopSd6LL.jpg)**146-0785 Carburetor for Onan Cummins Generator 4000-Watt A042P619 A041D736 Carb with Tune-Up Kit Replaces for Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KY26100R (Carb with Tune Up Kit)**DKIIGAME**$46.35**4 rev7mo ago](https://www.amazon.com/dp/B0G2LJVCQ7) [![149-2311 Fuel Pump 149-2457 Fuel Filter 1403280 Air Filter Tune Up Kit Compatible with Cummins Onan Microlite Microquiet RV 4000 4KW Generator Parts](https://m.media-amazon.com/images/I/41fozQO05BL.jpg)**149-2311 Fuel Pump 149-2457 Fuel Filter 1403280 Air Filter Tune Up Kit Compatible with Cummins Onan Microlite Microquiet RV 4000 4KW Generator Parts**AULDAY**$32.41**12 rev8mo ago](https://www.amazon.com/dp/B0FYVT195P) [![SIMPERAC 149-2311 Fuel Pump 149-2457 Fuel Filter for Onan 4000 Generator 3600 4000 Watts RV QG 4000 KY Microlite Microquiet Generators E11007 A029F889 A064S966 Fuel Pump Spark Plug Parts](https://m.media-amazon.com/images/I/41ua07acx1L.jpg)**SIMPERAC 149-2311 Fuel Pump 149-2457 Fuel Filter for Onan 4000 Generator 3600 4000 Watts RV QG 4000 KY Microlite Microquiet Generators E11007 A029F889 A064S966 Fuel Pump Spark Plug Parts**SIMPERAC**$23.91**14 rev11mo ago](https://www.amazon.com/dp/B0FKBBH45Z) [![LIDSCURA 149-2311 Fuel Pump and Fuel Filter Replacement for Cummins Onan QG4000 4000 4KW Replacement for Camp Power QG RV Generators Replaces 149-2457](https://m.media-amazon.com/images/I/411n+2UAtJL.jpg)**LIDSCURA 149-2311 Fuel Pump and Fuel Filter Replacement for Cummins Onan QG4000 4000 4KW Replacement for Camp Power QG RV Generators Replaces 149-2457**LIDSCURA**$22.70**10 rev1y ago](https://www.amazon.com/dp/B0F481R4TQ)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![KAKATHU 149-2311 Fuel Pump Tune Up Kit with 149-2457 Fuel Filter & 1403280 Air Filter Compatible with Cummins Onan 3600W & 4000W MicroQuiet Microlite KY Series Gas RV Generator Replace # E11007](https://m.media-amazon.com/images/I/518+bS-bSaL.jpg)**KAKATHU 149-2311 Fuel Pump Tune Up Kit with 149-2457 Fuel Filter & 1403280 Air Filter Compatible with Cummins Onan 3600W & 4000W MicroQuiet Microlite KY Series Gas RV Generator Replace # E11007**KAKATHU**$27.42**4.5★**▲ 245%**](https://www.amazon.com/dp/B0GKMV9LJ9) [![146-0785 Carburetor for Onan Cummins Generator 4000-Watt A042P619 A041D736 Carb with Tune-Up Kit Replaces for Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KY26100R (Carb with Tune Up Kit)](https://m.media-amazon.com/images/I/51VSopSd6LL.jpg)**146-0785 Carburetor for Onan Cummins Generator 4000-Watt A042P619 A041D736 Carb with Tune-Up Kit Replaces for Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KY26100R (Carb with Tune Up Kit)**DKIIGAME**$46.35**3.3★**▲ 147%**](https://www.amazon.com/dp/B0G2LJVCQ7) [![149-2311 Fuel Pump 149-2457 Fuel Filter 1403280 Air Filter Tune Up Kit Compatible with Cummins Onan Microlite Microquiet RV 4000 4KW Generator Parts](https://m.media-amazon.com/images/I/41fozQO05BL.jpg)**149-2311 Fuel Pump 149-2457 Fuel Filter 1403280 Air Filter Tune Up Kit Compatible with Cummins Onan Microlite Microquiet RV 4000 4KW Generator Parts**AULDAY**$32.41**4.6★**▲ 71%**](https://www.amazon.com/dp/B0FYVT195P) [![Onan OnaMax SAE 15W-40 Engine Oil 32 oz.](https://m.media-amazon.com/images/I/41gVeS3zz+L.jpg)**Onan OnaMax SAE 15W-40 Engine Oil 32 oz.**Cummins**$16.24**4.8★**▲ 62%**](https://www.amazon.com/dp/B00278MET8) [![LIDSCURA 149-2311 Fuel Pump and Fuel Filter Replacement for Cummins Onan QG4000 4000 4KW Replacement for Camp Power QG RV Generators Replaces 149-2457](https://m.media-amazon.com/images/I/411n+2UAtJL.jpg)**LIDSCURA 149-2311 Fuel Pump and Fuel Filter Replacement for Cummins Onan QG4000 4000 4KW Replacement for Camp Power QG RV Generators Replaces 149-2457**LIDSCURA**$22.70**5.0★**▲ 59%**](https://www.amazon.com/dp/B0F481R4TQ)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 102 weeks — +50.7% search growth over the last 90 days.

800600Spike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Jun, Jul, Aug · busiest ÷ quietest = 3.3×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Size-Overall**19%

*“Perfect fit”*

**Value For Money**15%

*“Great value”*

**Quality-Overall**14%

*“The product is fairly well made”*

**Assembly/Installation**12%

*“the components are put together well”*

**Fuel Efficiency**7%

*“Generator is now more efficient”*

**Durability**5%

*“Build quality feels premium with durable materials that handle fuel blends well—no leaks or issues after months of hot Florida use”*

**Maintenance And Repair**4%

*“which makes this a practical option for anyone who performs their own generator maintenance”*

**Advertised Vs Actual Product**4%

*“As advertised”*

**Filtration**3%

*“The only think good is the air filter”*

**Lubrication**2%

*“Using the manufacturer-recommended oil just makes sense”*

### **What buyers complain about **

**Functionality-Overall**14%

*“Did not work”*

**Quality-Overall**12%

*“They are cheap for a reason”*

**Value For Money**9%

*“Not worth the savings”*

**Pressure**5%

*“ours had too much pressure”*

**Durability**5%

*“Some last a while, some dont”*

**Connectivity-Overall**5%

*“Electrical connection for negative wire came off from inside the pump body”*

**Add-Ons/Attachments**5%

*“No means of reattaching due to the crimped end cap”*

**Size-Overall**3%

*“Fuel line was not the correct size”*

**Advertised Vs Actual Product**3%

*“The fittings include with the kit don't match the picture”*

**Ease Of Use**3%

*“The inline fuel filter of course is a bit hard to access”*

### **Top return reasons **

**Size-Overall**19%

**Defective Material/Parts**14%

**Filtration**12%

**Leak-Proof**9%

**Compatibility-Overall**9%

**Advertised Vs Actual Product**9%

**Value For Money**5%

**Functionality-Overall**5%

**Assembly/Installation**3%

**Lubrication**3%