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Napa 4003 Fuel Filter

Fail

Demand is soft, at -36.0% this quarter, so Napa 4003 Fuel Filter is a Fail.

Flapen Score
48
48 / 100
Ranks 3,828 of 7,287 Automotive niches · −1 vs the category median of 49
Market size
$243K/yr300K searches / yr
90-day growth
-36.0%search demand this quarter
Competition
76%top-5 click share · 7 brands · 39 sellers

Flapen Score

Napa 4003 Fuel Filter against its category

The dotted line is the Automotive average. Past it, Napa 4003 Fuel Filter is stronger. Inside it, weaker.

48Fail
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The Napa 4003 Fuel Filter market on Amazon at a glance

Shoppers on Amazon United States searched for Napa 4003 Fuel Filter 300K times last year and spent an estimated $243K. The top 5 brands take 94% of clicks. Demand peaks in Jan–Feb–Dec. Flapen scores it 48 out of 100, a Fail.

01 · Demand

An estimated 1.6% of those searches ended in a purchase.

Shoppers searched for this 300K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 1.6% of those searches ended in a purchase. Searches in the last 90 days moved -36.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated $243K a year.

Searches, last 12 months
300K
Growth, 90 days vs prior 90
-36.0%
Conversion, latest week
1.6%
Market size, estimated
$243Ka year
Peak month
January2.4× the quietest month
Top search term
solvent filter trap130K searches a year

02 · Price

A sale here is worth $51.52.

Listings sell for $51.52 on average, from $27.97 to $71.00. Amazon reports units sold in ranges. This niche sold 2K to 3K a year. The average listing sells 0 to 100 of them. At $51.52 that is $0 to $5K a year per listing.

Average price
$51.52inside the $15 to $100 sweet spot
Price range
$27.97–$71.00
Amazon United States median price
$24.38across 115,062 niches
Units sold a year
2K–3K
Units per listing a year
0–100
Revenue per listing a year
$0–$5K
Returns
0.0%of orders · Amazon United States median 2.1%

03 · Entry bar

The bar here is ads.

100% of listings pay for placement with sponsored ads. 0% ship with Prime. On an average day, 14.8% of listings are out of stock. The average listing ranks #3,305 within Filters. It carries 7 reviews at 3.88 stars, so a new listing needs social proof before a better product.

Sponsored listings
100%
Prime listings
0%
Out of stock, average day
14.8%
Average rank
#3,305in Filters
Average rating
3.88 starsAmazon United States average 4.42 stars
Average reviews
7per listing
Listings tracked
12

04 · Newcomers

4 of last year's 12 launches cleared the first-year sales bar.

12 products launched here in the last 12 months. 4 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 54 months on average, so the names here are settling in.

Launched, last 12 months
12
Successful launches
4Amazon's first-year sales bar
Average brand age
54 months

Products

Top Napa 4003 Fuel Filter products & what they sell for

The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.

Prices and ratings read from Amazon on Jul 9, 2026. The live listing can differ.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 76% of clicks. A locked shelf that new listings rarely crack.

$0$24K$49K$73K$97K110100 Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

7 falling

Sellers

39

Est. top-5 brand share

94%

Top 20: 100%

Est. 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

Napa 4003 Fuel Filter search demand

Weekly searches over the year, seasonality beneath. Pick a range.

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

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

Search terms

Top Napa 4003 Fuel Filter search terms shoppers use

The exact words shoppers type, with estimated yearly volume, growth, and conversion.

  • 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

Reviews and returns

What reviews say buyers love and hate about Napa 4003 Fuel Filter

We read the reviews and the return reasons for every product selling here.

32%of positive reviews mention “Quality-Overall”
25%of negative reviews mention “Leak-Proof”
<0.1%of orders come back, a rate Amazon rounds to zero
“Leaking junk”
A buyer, on “Leak-Proof”25% of negative reviews mention the same topic

Every topic

Every topic buyers talk about, one row each.

Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.

17 topics

NegativePositive

FAQ

Common Napa 4003 Fuel Filter questions

Answered from the same tracked data.

Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data