---
title: "napa 4003 fuel filter — Niche Verdict: Skip it (48/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/napa-4003-fuel-filter"
last_updated: "2026-07-14T01:50:25.862Z"
locale: en
meta:
  description: "soft demand (-36.0% this quarter) — napa 4003 fuel filter doesn't clear our bar today."
  "og:description": "soft demand (-36.0% this quarter) — napa 4003 fuel filter doesn't clear our bar today."
  "og:title": "napa 4003 fuel filter — Niche Verdict: Skip it (48/100) | Amazon United States - Flapen"
---

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# **napa 4003 fuel filter**

**Skip it**

Soft demand (-36.0% this quarter) — this niche doesn't clear our bar today.

Market size 45Growth 7Conversion 20Competition 20Returns 100Price range 95Avg price 93Brand share 14Review moat 100Quality gap 96

**Review moat**

**Incredible****7.25**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Incredible****0.0%**

return rate — above 6% kills the launch gate

**Quality gap**

**Incredible****3.9★**

avg incumbent rating — lower means beatable quality

**Price range**

**Incredible****$27.97–$71.00**

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

**Avg price**

**Great****$51.52**

avg listing price — sweet spot $15–$100

**Market size**

**Okay****$243K**

$243K/yr · 300K searches

**Conversion**

**Bad****1.6%**

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

**Competition**

**Bad****76%**

top-5 click share — a locked-up shelf

**Brand share**

**Bad****94%**

top-5 brand share — brand-locked demand

**Growth**

**Bad****-36.0%**

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

## **Competition**

The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**7 **▼falling

**Sellers**

**39**

**Top-5 brand share**

**94%**

**Open market**

**2%**

- linenb31% - Topzywlc29% - TrixmEsque14% - Generic11% - LOKLNEYK9% - Skluauat4% - Open — no brand owns it (1 brand, 2%)

## **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%$24K20%$49K30%$73K40%$97K110100 Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 12 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Black Aluminum Solvent Filter Trap Kit High-Efficiency 1/2x28 Fuel Filter with Baffles Suppressor Cleaner Oil Filter](https://m.media-amazon.com/images/I/313uaoiQc-L.jpg)**Black Aluminum Solvent Filter Trap Kit High-Efficiency 1/2x28 Fuel Filter with Baffles Suppressor Cleaner Oil Filter**linenb**$31.98**4.8★18 rev](https://www.amazon.com/dp/B0GTGQXL8G) [2![Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (1/2 x 28)](https://m.media-amazon.com/images/I/51c8xcxWAeL.jpg)**Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (1/2 x 28)**Topzywlc**$50.66**3.2★14 rev](https://www.amazon.com/dp/B0GVSL3JXG) [3![Solvent Filter Trap 1/2 x 28 Black Aluminum Solvent Filter Trap Kit with Multiple End Caps for Industrial Grade Automotive Accessories (1PC)](https://m.media-amazon.com/images/I/51GlU0O54WL.jpg)**Solvent Filter Trap 1/2 x 28 Black Aluminum Solvent Filter Trap Kit with Multiple End Caps for Industrial Grade Automotive Accessories (1PC)**Generic**$59.08**5.0★1 rev](https://www.amazon.com/dp/B0GVYLSPJL) [4![Solvent Filter Trap 1/2 X 28 Black Aluminum Fuel Filter Kit with Multiple End Caps Industrial Grade Automotive Accessories 1/2 x 28 * 1 set](https://m.media-amazon.com/images/I/4188yE82AEL.jpg)**Solvent Filter Trap 1/2 X 28 Black Aluminum Fuel Filter Kit with Multiple End Caps Industrial Grade Automotive Accessories 1/2 x 28 * 1 set**TrixmEsque**$63.47**4.4★8 rev](https://www.amazon.com/dp/B0GVMBGHVD) [5![Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (5/8 x 24)](https://m.media-amazon.com/images/I/51c8xcxWAeL.jpg)**Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (5/8 x 24)**Topzywlc**$50.67**3.2★14 rev](https://www.amazon.com/dp/B0GVSQM86V)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![6 & 10 Inch Extension Spiral 1/2-28 5/8-24 Single Core Automotive Metal Fuel Filter Housing Assembly Solvent Trap for NAPA 4003 WIX 24003 Car Alloy Fuel Filter Component (6inch 35mm 1/2-28)](https://m.media-amazon.com/images/I/41mWxlOF6SL.jpg)**6 & 10 Inch Extension Spiral 1/2-28 5/8-24 Single Core Automotive Metal Fuel Filter Housing Assembly Solvent Trap for NAPA 4003 WIX 24003 Car Alloy Fuel Filter Component (6inch 35mm 1/2-28)**GENTERUN**$56.94**1 rev2mo ago](https://www.amazon.com/dp/B0H18Q8QDX) [![Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Black)](https://m.media-amazon.com/images/I/41SIulGQMGL.jpg)**Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Black)**Topzywlc**$27.97**1 rev3mo ago](https://www.amazon.com/dp/B0GW8D6YTF) [![Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Red)](https://m.media-amazon.com/images/I/41IaAhRioeL.jpg)**Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Red)**Topzywlc**$27.97**1 rev3mo ago](https://www.amazon.com/dp/B0GW8JPG9S) [![Solvent Filter Trap 1/2 x 28 Black Aluminum Solvent Filter Trap Kit with Multiple End Caps for Industrial Grade Automotive Accessories (1PC)](https://m.media-amazon.com/images/I/51GlU0O54WL.jpg)**Solvent Filter Trap 1/2 x 28 Black Aluminum Solvent Filter Trap Kit with Multiple End Caps for Industrial Grade Automotive Accessories (1PC)**Generic**$59.08**1 rev3mo ago](https://www.amazon.com/dp/B0GVYLSPJL) [![Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (1/2 x 28)](https://m.media-amazon.com/images/I/51c8xcxWAeL.jpg)**Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (1/2 x 28)**Topzywlc**$50.66**14 rev3mo ago](https://www.amazon.com/dp/B0GVSL3JXG)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Red)](https://m.media-amazon.com/images/I/41IaAhRioeL.jpg)**Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Red)**Topzywlc**$27.97**5.0★**▲ 25%**](https://www.amazon.com/dp/B0GW8JPG9S) [![6 & 10 Inch Extension Spiral 1/2-28 5/8-24 Single Core Automotive Metal Fuel Filter Housing Assembly Solvent Trap for NAPA 4003 WIX 24003 Car Alloy Fuel Filter Component (6inch 35mm 1/2-28)](https://m.media-amazon.com/images/I/41mWxlOF6SL.jpg)**6 & 10 Inch Extension Spiral 1/2-28 5/8-24 Single Core Automotive Metal Fuel Filter Housing Assembly Solvent Trap for NAPA 4003 WIX 24003 Car Alloy Fuel Filter Component (6inch 35mm 1/2-28)**GENTERUN**$56.94**2.0★**▲ 25%**](https://www.amazon.com/dp/B0H18Q8QDX) [![Solvent Filter Trap 5/8 x 24 Black Aluminum Fuel Filter Kit with Multiple End Caps Industrial Grade Automotive Accessories (5/8 x 24 * 1 set)](https://m.media-amazon.com/images/I/4188yE82AEL.jpg)**Solvent Filter Trap 5/8 x 24 Black Aluminum Fuel Filter Kit with Multiple End Caps Industrial Grade Automotive Accessories (5/8 x 24 * 1 set)**TrixmEsque**$69.05**4.4★**▲ 25%**](https://www.amazon.com/dp/B0GXK34GST) [![Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Black)](https://m.media-amazon.com/images/I/41SIulGQMGL.jpg)**Solvent Filter Trap 50mm Universal Aluminum Alloy Solvent Trap Kit 100 Micron Inline Automotive Fuel Filter with An6 An8 An10 Adapter for Filtering Unleaded Gasoline Ethanol and Alcohol (Black)**Topzywlc**$27.97**5.0★**▲ 25%**](https://www.amazon.com/dp/B0GW8D6YTF) [![Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (1/2 x 28)](https://m.media-amazon.com/images/I/51c8xcxWAeL.jpg)**Solvent Filter Trap Black Aluminum Solvent Trap Kit 1/2 x 28 & 5/8 x 24 Automotive Fuel Filter 8 Filter Element with Multiple End Caps for Industrial Grade Automotive Accessories (1/2 x 28)**Topzywlc**$50.66**3.2★**▲ 24%**](https://www.amazon.com/dp/B0GVSL3JXG)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -36.0% search growth over the last 90 days.

9K7KSpike '24Holiday '24Prime Day '25Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Jan, Feb, Dec · busiest ÷ quietest = 2.4×

## **Reviews**

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

### **What buyers love **

**Quality-Overall**32%

*“Great product, just as advertised”*

**Advertised Vs Actual Product**14%

*“Works as it should”*

**Ease Of Cleaning**10%

*“Simple twist-on design making the whole process much cleaner and more efficient”*

**Value For Money**8%

*“Maybe a lower price lol would be wonderfully appreciated”*

**Fuel Efficiency**8%

*“After the ATF kicks yours in”*

**Size-Overall**6%

*“Fits perfectly”*

**Motor Power**6%

*“Almost like Hiram Percy Maxim designed it for a 30cc engine himself”*

**Filtration**5%

*“Its a inline filter that works pretty well”*

**Design-Overall**3%

*“Perfect design and works really well, easy to clean, not sure why others rated it poorly,”*

**Assembly/Installation**3%

*“Worked great and easy to install”*

### **What buyers complain about **

**Leak-Proof**25%

*“Leaking junk”*

**Quality-Overall**19%

*“Garbage”*

**Noise Level**19%

*“My neighbors are constantly complaining about the noise these little nitro engines make, so I machined a slip coupler with a 1/2-28 thread and voilà”*

**Material Quality**13%

*“Also the endcaps are cheap plastic”*

**Advertised Vs Actual Product**13%

*“This is not what is advertised DO NOT BUY THIS”*

**Functionality-Overall**6%

*“Does not work at all”*

### **Top return reasons **

**Filtration**33%

**Advertised Vs Actual Product**30%

**Functionality-Overall**10%

**Compatibility-Overall**5%

**Size-Overall**5%

**Defective Material/Parts**5%

**Value For Money**5%

**Quality-Overall**3%

**Material Quality**3%

**Durability**3%