napa 4003 fuel filter
Skip itSoft demand (-36.0% this quarter) — this niche doesn't clear our bar today.
Review moat
Incredible7.25avg incumbent reviews — the moat a new listing must climb
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Quality gap
Incredible3.9★avg incumbent rating — lower means beatable quality
Price range
Incredible$27.97–$71.00cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$51.52avg listing price — sweet spot $15–$100
Market size
Okay$243K$243K/yr · 300K searches
Conversion
Bad1.6%search→purchase rate — share of searches ending in a sale
Competition
Bad76%top-5 click share — a locked-up shelf
Brand share
Bad94%top-5 brand share — brand-locked demand
Growth
Bad-36.0%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, napa 4003 fuel filter is a $243K/yr Amazon United States market (300K searches/yr). The top 5 brands hold 94% of demand. Demand peaks in Jan–Feb–Dec. Verdict: Skip it — 48/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
napa 4003 fuel filter market data
- Units sold / yr
- 2K–3K
- avg 0–100/product
- Revenue / yr
- $103K–$129K
- units × avg price
- Conversion rate
- 1.6%
- Avg BSR
- #3,305
- Page quality
- 0%
- Prime
- 0%
- Sponsored
- 100%
- Out of stock
- 14.8%
- Avg brand age
- 54 months
- Avg seller age
- 159 days
Competition & brand share
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%
Top 20: 100%
Top-5 click share
76%
Top 20: 100%
Open market
2%
- linenb31%
- Topzywlc29%
- TrixmEsque14%
- Generic11%
- LOKLNEYK9%
- Skluauat4%
- Open — no brand owns it (1 brand, 2%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -36.0% search growth over the last 90 days.Peak months: Jan, Feb, Dec · busiest ÷ quietest = 2.4×
Top napa 4003 fuel filter search terms
- solvent filter trap130K/yr
- solvent trap76K/yr
- solvent filter trap 1/2 x 2836K/yr
- fuel filter 1/2 x 2822K/yr
- solvent filter6K/yr
- solvent filter trap 1/2 x 28 with baffles4K/yr
- solvent filter trap 1/2 x 28 suppressor6K/yr
- 1/2x28 fuel filter6K/yr
- solvent filter trap 5/8 x 245K/yr
- solvent tramp 1/2 x 28 with baffles5K/yr
Top napa 4003 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.
All 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Black Aluminum Solvent Filter Trap Kit High-Efficiency 1/2x28 Fuel Filter with Baffles Suppressor Cleaner Oil Filter
linenb$31.984.8★18 rev
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$50.663.2★14 rev
Solvent Filter Trap 1/2 x 28 Black Aluminum Solvent Filter Trap Kit with Multiple End Caps for Industrial Grade Automotive Accessories (1PC)
Generic$59.085.0★1 rev
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$63.474.4★8 rev
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$50.673.2★14 rev
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)
GENTERUN$56.941 rev
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$27.971 rev
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$27.971 rev
Solvent Filter Trap 1/2 x 28 Black Aluminum Solvent Filter Trap Kit with Multiple End Caps for Industrial Grade Automotive Accessories (1PC)
Generic$59.081 rev
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$50.6614 rev
Trending
90-day click momentumSolvent 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$27.975.0★
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$56.942.0★
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$69.054.4★
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$27.975.0★
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$50.663.2★
What buyers say about napa 4003 fuel filter
What buyers praise and complain about, mined from review topics.What buyers love
“Great product, just as advertised”
“Works as it should”
“Simple twist-on design making the whole process much cleaner and more efficient”
“Maybe a lower price lol would be wonderfully appreciated”
“After the ATF kicks yours in”
“Fits perfectly”
“Almost like Hiram Percy Maxim designed it for a 30cc engine himself”
“Its a inline filter that works pretty well”
“Perfect design and works really well, easy to clean, not sure why others rated it poorly,”
“Worked great and easy to install”
What buyers complain about
“Leaking junk”
“Garbage”
“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”
“Also the endcaps are cheap plastic”
“This is not what is advertised DO NOT BUY THIS”
“Does not work at all”
Top return reasons
Common questions
- Is napa 4003 fuel filter profitable to sell on Amazon United States?
- The niche generates $243K/yr across 12 tracked products. 4 of 12 products launched in the last 360 days are still selling. 90-day search growth is -36.0%. Flapen's verdict: Skip it (48/100).
- How competitive is the napa 4003 fuel filter niche?
- 7 brands and 39 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 94% of demand.
- What do buyers complain about in napa 4003 fuel filter?
- Top complaints mined from reviews: Leak-Proof, Quality-Overall, Noise Level. The return rate is 0.0%.
- When does demand for napa 4003 fuel filter peak?
- Demand peaks in Jan–Feb–Dec; the busiest month runs 2.4× the quietest.
- What does it cost to enter the napa 4003 fuel filter niche?
- Listings span $27.97–$71.00; the average listing price is $51.52 (sweet spot $15–$100). The average incumbent carries 7 reviews — the moat a new listing must climb.