---
title: "Inline Fuel Filter — $164K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/inline-fuel-filter"
last_updated: "2026-08-10T18:11:59.325Z"
locale: en
meta:
description: "Niche score 61/100 · $164K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 61/100 · $164K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Inline Fuel Filter — $164K/yr Amazon US Niche (2026) - Flapen"
---
# **inline fuel filter**
**Worth a look**
Shows low returns (1.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 34Growth 49Conversion 76Competition 59Returns 93Price range 79Avg price 75Brand share 76Review moat 74Quality gap 40
**Returns**
**Great****1.1%**
return rate — above 5% kills the launch gate
**Price range**
**Great****$5.96–$49.96**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****7.2%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Great****59%**
top-5 brand share — no brand owns this niche
**Avg price**
**Great****$14.95**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****553**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Good****49%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+19.6%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****$164K**
$164K/yr · 153K searches
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, inline fuel filter is a $164K/yr Amazon United States market (153K searches/yr). The top 5 brands hold 59% of demand. Demand peaks in Aug. Verdict: Worth a look — 61/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **inline fuel filter market data**
- **Units sold / yr**
- **10K–13K**
- avg 100–250/product
- **Revenue / yr**
- **$150K–$187K**
- units × avg price
- **Conversion rate**
- **7.2%**
- **Avg BSR**
- **#100**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **3.7%**
- **Avg brand age**
- **58 months**
- **Avg seller age**
- **163 days**
## **Competition & brand share**
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**23 **▼falling
**Sellers**
**70**
**Top-5 brand share**
**59%**
Top 20: 98%
**Top-5 click share**
**49%**
Top 20: 89%
**Open market**
**34%**
- Wix17% - K&N13% - CocoMocart13% - Snwoygr9% - Deflife7% - Strongthium7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +19.6% search growth over the last 90 days.
5K4KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Aug · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/us/automotive/inline-fuel-filter/trend)
## **Top inline fuel filter search terms**
- **inline fuel filter**113K/yr+26.6%5.1% conv. - **in line fuel filter**25K/yr+4.1%5.7% conv. - **universal fuel filter**10K/yr-12.5%2.5% conv. - **fuel line filter**4K/yr+19.4%4.4% conv. [**All search terms **](https://flapen.com/research/us/automotive/inline-fuel-filter/search-terms)
## **Top inline fuel filter products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%4%$7K8%$13K12%$20K16%$26K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**K&N 81-0300 Replacement Fuel Filter**K&N**$9.21**4.5★3,954 rev](https://www.amazon.com/dp/B07X64ZN5H) [2**CocoMocart 10 Pack 1/4 Inch Inline Fuel Filter for Kawasaki Briggs & Stratton Kohler Engines - Universal Replacement Gasoline Filters with Magnet 1/4 and 5/16 For John Deere**CocoMocart**$9.95**4.4★2,127 rev](https://www.amazon.com/dp/B06XDJR2JT) [3**Snwoygr 10 PCS Gas Inline Fuel Filters with Magnet for Kawasaki Kohler John Deere Lawn Mower Small Engine Third Generation Universal Replacement Fuel Filter for 1/4 IN and 5/16 IN**Snwoygr**$6.81**4.4★612 rev](https://www.amazon.com/dp/B0DFXQCWBH) [4**WIX Racing Filters Fuel Filter**Wix**$6.28**4.7★1,244 rev](https://www.amazon.com/dp/B000CSEUPG) [5**WIX 33033 Universal In-Line Fuel Filter with 3/8 Clamp-On Inlet/Outlet Max Pressure 60-PSI**Wix**$7.31**4.8★1,477 rev](https://www.amazon.com/dp/B000C9WJ8U)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**TRHSIFF 10 PCS 1/4 Inch and 5/16 Inch Gas Inline Fuel Filters with Magnet for Kawasaki Kohler John Deere Lawn Mower Small Engine Upgrade Universal Replacement Fuel Filter with 10 Clips**TRHSIFF**$7.31**96 rev8mo ago](https://www.amazon.com/dp/B0FXPKD5QN) [**EVIL ENERGY 3/8 Barb Billet Inline Fuel Filter 30 Micron Aluminum Black for Car EFI & Carb Fuel Systems Motorcycle and Boats**EVIL ENERGY**$19.77**107 rev1y ago](https://www.amazon.com/dp/B0F7RCPY7C) [**Inline Fuel Filter for Lawn Mower Small Engine Kohler John Deere Kawasaki - Gas Filter Replacement with High Flow Design (12-Pack)**WYTUDTE**$8.33**103 rev1y ago](https://www.amazon.com/dp/B0FG2CVYV8) [**Medoon 10 Micron Inline Fuel Filter with 6AN 8AN 10AN Adapter(6pcs) Barb 1/2 3/8 5/16 Fitting Adapter (6pcs) Bracket Clamp 50MM Universal 10 Micron Filter Element Replacement**Medoon**$35.38**62 rev1y ago](https://www.amazon.com/dp/B0FBGJD87M) [**YAMAKATO 1/4 Inline Copper Fuel Filters for Dirt Mini Bike ATV Motorcycle UTV Snowmobile more with 1/4 fuel lines 2pcs with 2 clamps**YAMAKATO**$6.95**97 rev1y ago](https://www.amazon.com/dp/B0DXKSTCMB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**AM116304 Fuel Filter 25 050 22-S for John Deere Kohler 120-436 GY20709 For 1/4 and 5/16 Fuel Line Replaces 71-5960 120-436 GY20709 38666 149-2206-01 21541500 98021**ASSOTS**$6.22**4.6★**▲ 142%**](https://www.amazon.com/dp/B08R94CM9W) [**TRHSIFF 10 PCS 1/4 Inch and 5/16 Inch Gas Inline Fuel Filters with Magnet for Kawasaki Kohler John Deere Lawn Mower Small Engine Upgrade Universal Replacement Fuel Filter with 10 Clips**TRHSIFF**$7.31**4.4★**▲ 100%**](https://www.amazon.com/dp/B0FXPKD5QN) [**FUEL FILTERS INDUSTRIAL HIGH PERFORMANCE UNIVERSAL INLINE GAS FUEL LINE 3/8 2 Pack**Deflife**$9.51**4.5★**▲ 96%**](https://www.amazon.com/dp/B0CZLKX3YF) [**Quicksilver 879885Q Inline Fuel Filter for Mercury and Mariner Outboards**Quicksilver**$15.48**4.8★**▲ 83%**](https://www.amazon.com/dp/B004QJQO6A) [**YAMAKATO 1/4 Inline Copper Fuel Filters for Dirt Mini Bike ATV Motorcycle UTV Snowmobile more with 1/4 fuel lines 2pcs with 2 clamps**YAMAKATO**$6.95**4.7★**▲ 73%**](https://www.amazon.com/dp/B0DXKSTCMB)
**~~View all trending →~~**
## **What buyers say about inline fuel filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**19%
*“Great filter”*
**Quality-Overall**16%
*“This kit is high quality”*
**Value For Money**13%
*“Good Price”*
**Advertised Vs Actual Product**12%
*“As advertised”*
**Size-Overall**12%
*“Perfect fit and exactly as described”*
**Fuel Efficiency**5%
*“Keep your fuel clean”*
**Efficiency**4%
*“The clear filter helps keep an eye on debris”*
**Assembly/Installation**3%
*“It looks GREAT when initially installed”*
**Leak-Proof**2%
*“Didnt leak,”*
**Mounting**1%
*“I like that this comes with the mount”*
### **What buyers complain about **
**Filtration**18%
*“Filter are junk”*
**Leak-Proof**14%
*“They leak”*
**Quality-Overall**14%
*“no quality control”*
**Size-Overall**10%
*“They're a bit smaller than I expected”*
**Durability**8%
*“Do not last”*
**Fuel Efficiency**5%
*“This will not flow enough fuel for automotive applications”*
**Material Quality**2%
*“This hose feels like a different kind of material”*
**Value For Money**2%
*“They are spendy for what it is”*
**Jamming/Clogging**2%
*“Some of these filters either leak or are clogged”*
**Advertised Vs Actual Product**1%
*“Not what I was looking for”*
### **Top return reasons **
**Size-Overall**66%
**Filtration**12%
**Compatibility-Overall**6%
**Advertised Vs Actual Product**3%
**Defective Material/Parts**2%
**Value For Money**1%
**Fuel Efficiency**1%
**Leak-Proof**1%
**Quality-Overall**1%
**Functionality-Overall**1%
## **Common questions**
- **Is inline fuel filter profitable to sell on Amazon United States?**
- The niche generates $164K/yr across 33 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +19.6%. Flapen's verdict: Worth a look (61/100).
- **How competitive is the inline fuel filter niche?**
- 23 brands and 70 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 59% of demand.
- **What do buyers complain about in inline fuel filter?**
- Top complaints mined from reviews: Filtration, Leak-Proof, Quality-Overall. The return rate is 1.1%.
- **When does demand for inline fuel filter peak?**
- Demand peaks in Aug; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the inline fuel filter niche?**
- Listings span $5.96–$49.96; the average listing price is $14.95 (sweet spot $15–$100). The average incumbent carries 553 reviews — the moat a new listing must climb.
## **Related niches in Automotive**
- 72 [**brake bleeder kit**](https://flapen.com/research/us/automotive/brake-bleeder-kit)$2.2M/yr+8.2%**Launch it**- 72 [**gas can pump**](https://flapen.com/research/us/automotive/gas-can-pump)$1.7M/yr+20.1%**Launch it**- 72 [**dewalt hedge trimmer**](https://flapen.com/research/us/automotive/dewalt-hedge-trimmer)$1.6M/yr+158.2%**Launch it**- 72 [**iron eraser**](https://flapen.com/research/us/automotive/iron-eraser)$107K/yr>1,000%**Worth a look**- 72 [**marine fuel line**](https://flapen.com/research/us/automotive/marine-fuel-line)$198K/yr+104.3%**Worth a look**- 72 [**garden hose filter**](https://flapen.com/research/us/automotive/garden-hose-filter)$729K/yr+110.7%**Worth a look**[**All Automotive niches **](https://flapen.com/research/us/automotive)