Is s3213 fuel water separator filter profitable to sell on Amazon United States?

The niche generates $43K/yr across 20 tracked products. 2 of 5 products launched in the last 360 days are still selling. 90-day search growth is +124.8%. Flapen's verdict: Worth a look (60/100).

How competitive is the s3213 fuel water separator filter niche?

15 brands and 38 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 71% of demand.

What do buyers complain about in s3213 fuel water separator filter?

Top complaints mined from reviews: Leak-Proof, Filtration, Quality-Overall. The return rate is 1.4%.

When does demand for s3213 fuel water separator filter peak?

Demand peaks in Apr–May–Jun–Jul; the busiest month runs 3.9× the quietest.

What does it cost to enter the s3213 fuel water separator filter niche?

Listings span $10.60–$70.53; the average listing price is $26.31 (sweet spot $15–$100). The average incumbent carries 104 reviews — the moat a new listing must climb.

s3213 fuel water separator filter

Worth a look

Shows demand growing +124.8% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Growth

Incredible+124.8%

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

Review moat

Great103.9

avg incumbent reviews — the moat a new listing must climb

Avg price

Incredible$26.31

avg listing price — sweet spot $15–$100

Price range

Great$10.60–$70.53

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

Returns

Great1.4%

return rate — above 5% kills the launch gate

Conversion

Great7.6%

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

Brand share

Good71%

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

Competition

Okay60%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$43K

$43K/yr · 21K searches

Signals Trending Low Review Barrier

According to Flapen's Amazon United States niche tracking, s3213 fuel water separator filter is a $43K/yr Amazon United States market (21K searches/yr). The top 5 brands hold 71% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 60/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

s3213 fuel water separator filter market data

Units sold / yr: 3K–3K; avg 100–250/product
Revenue / yr: $66K–$79K; units × avg price
Conversion rate: 7.6%
Avg BSR: #907
Page quality: 0%
Prime: 90%
Sponsored: 85%
Out of stock: 0.0%
Avg brand age: 51 months
Avg seller age: 208 days

Competition & brand share

The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them.

Brands

15 falling

Sellers

Top-5 brand share

71%

Top 20: 100%

Top-5 click share

60%

Top 20: 100%

Open market

23%

ATRACYPART24%
AULDAY16%
Vkinman13%
TRSCJXN10%
DZFST.FI9%
SEGULER5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +124.8% search growth over the last 90 days.

Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 3.9×

Open Trend

Top s3213 fuel water separator filter search terms

s3213 fuel water separator10K/yr +220.1%8.1% conv.
s32134K/yr +65.4%11.3% conv.
racor s32133K/yr +78.3%7.9% conv.
s3213 fuel filter4K/yr +46.6%12.8% conv.

All search terms

Top s3213 fuel water separator 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.

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

All 20 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

S3213 Fuel Filter Marine Water Separator with Clear Bowl AssemblyReplacement For Marine Outboard Motor Mercury Replaces# 35-60494-1 18-7932-1 18-17928 35-809097

ATRACYPART$20.134.6★168 rev

Vkinman S3213 Fuel Filter Marine Fuel Water Separator Replacement for Marine Outboard Motor Compatible with Mercury Replaces 35-60494-1 B32013 18-7932-1 (2Pcs)

Vkinman$22.284.3★38 rev

DZFST.FI S3213 Fuel Water Separator Filter Compatible with Marine Outboard Motor Mercury Yamaha Racor Sierra Engine Boat 10 Micron Replaces# 35-60494-1 S3213 18-7932-1 18-17928 35-809097

DZFST.FI$19.204.5★108 rev

S3213 Fuel Water Separator Marine Kit Compatible with Yamaha and for Mercury Marine Outboard Motor with 3/8 Barb x 1/4 NPT Brass Fittings Replaces B32013 35-60494-1 18-7932-1 18-17928 35-809097

TRSCJXN$24.324.6★51 rev

S3213 Fuel Filter Marine Fuel Water Separator With Clear Bowl Replacement for Marine Outboard Motor Replaces# 35-60494-1 S3213 18-7932-1 18-17928 35-809097

AULDAY$18.924.5★225 rev

Newest

by launch date

S3213 Marine Fuel Water Separator Filter Assembly with Clear Bowl 3/8 Inch NPT Port Compatible with Yamaha and for Mercury Outboard Motors Replaces 35-60494-1 18-7932-1 18-17928 35-809097

TRSCJXN$17.321 rev

4w ago

S3213 Fuel Water Separator Filter with Clear Bowl: 10 Micron Marine Fuel Filter Compatible with Yamaha/Mercury/Suzuki/Racor. Replaces 35-60494-1 18-7932-1. Installation Kit Screws Fittings & Clamps

SURGLA$26.0525 rev

5mo ago

S3213 Fuel Water Separator Marine Kit Compatible with Yamaha and for Mercury Marine Outboard Motor with 3/8 Barb x 1/4 NPT Brass Fittings Replaces B32013 35-60494-1 18-7932-1 18-17928 35-809097

TRSCJXN$24.3251 rev

8mo ago

2PCS S3213 Fuel Filter Marine Fuel Water Separator Replacement for Marine Outboard Motor Replaces# 35-60494-1 S3213 18-7932-1 18-17928 35-809097

AULDAY$22.0311 rev

11mo ago

2PCS S3213 Fuel Filter Marine Fuel Water Separator With Clear Bowl Replacement for Marine Outboard Motor Replaces# 35-60494-1 S3213 18-7932-1 18-17928 35-809097

AULDAY$36.9715 rev

11mo ago

What buyers say about s3213 fuel water separator filter

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

What buyers love

Quality-Overall21%

“The build quality feels solid and well-made, and installation was simple and straightforward”

Value For Money17%

“Great value for price”

Advertised Vs Actual Product11%

“As Advertised”

Filtration8%

“Good filter system”

Assembly/Installation8%

“My son was excited to help watch the installation”

Leak-Proof8%

“does not leak”

Size-Overall7%

“Good fit”

Ease Of Use4%

“easy solution”

Fuel Efficiency3%

“the product was easy to modify to fit my fuel system”

Maintenance And Repair2%

“Cost effective preventative maintenance”

What buyers complain about

Leak-Proof23%

“Fuel leaking”

Filtration19%

“Filter was not the correct one”

Quality-Overall8%

“were kind of cheap”

Assembly/Installation5%

“havent installed it”

Metal Quality5%

“Metal shavings”

Defective Material/Parts5%

“The plastic piece on the bottom would not screw on tightly”

Water Resistance2%

“My boat has a chronic issue with water getting into the fuel”

Functionality-Overall2%

“within 5 minutes the same issue”

Rubber Quality2%

“The rubber O-rings dont work”

Measurement/Reading Accuracy2%

“Cross reference numbers are incorrect”

Top return reasons

Size-Overall45%

Compatibility-Overall12%

Filtration11%

Defective Material/Parts7%

Advertised Vs Actual Product5%

Leak-Proof3%

Functionality-Overall3%

Mounting2%

Assembly/Installation2%

Value For Money2%

Common questions

Is s3213 fuel water separator filter profitable to sell on Amazon United States?: The niche generates $43K/yr across 20 tracked products. 2 of 5 products launched in the last 360 days are still selling. 90-day search growth is +124.8%. Flapen's verdict: Worth a look (60/100).
How competitive is the s3213 fuel water separator filter niche?: 15 brands and 38 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 71% of demand.
What do buyers complain about in s3213 fuel water separator filter?: Top complaints mined from reviews: Leak-Proof, Filtration, Quality-Overall. The return rate is 1.4%.
When does demand for s3213 fuel water separator filter peak?: Demand peaks in Apr–May–Jun–Jul; the busiest month runs 3.9× the quietest.
What does it cost to enter the s3213 fuel water separator filter niche?: Listings span $10.60–$70.53; the average listing price is $26.31 (sweet spot $15–$100). The average incumbent carries 104 reviews — the moat a new listing must climb.