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

The niche generates $246K/yr across 36 tracked products. 3 of 5 products launched in the last 360 days are still selling. 90-day search growth is +66.6%. Flapen's verdict: Worth a look (64/100).

How competitive is the fuel water separator marine niche?

24 brands and 139 sellers compete. The top 5 products take 50% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in fuel water separator marine?

Top complaints mined from reviews: Leak-Proof, Filtration, Size-Overall. The return rate is 1.2%.

When does demand for fuel water separator marine peak?

Demand peaks in Apr–May–Jun–Jul; the busiest month runs 2.7× the quietest.

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

Listings span $7.30–$55.50; the average listing price is $22.04 (sweet spot $15–$100). The average incumbent carries 594 reviews — the moat a new listing must climb.

fuel water separator marine

Worth a look

Shows a sweet-spot price point ($22.04 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Avg price

Great$22.04

avg listing price — sweet spot $15–$100

Returns

Great1.2%

return rate — above 5% kills the launch gate

Price range

Great$7.30–$55.50

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

Growth

Great+66.6%

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

Review moat

Good594.22

avg incumbent reviews — the moat a new listing must climb

Conversion

Good5.5%

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

Competition

Good50%

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

Brand share

Good72%

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

Market size

Okay$246K

$246K/yr · 204K searches

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Signals Low Review Barrier

According to Flapen's Amazon United States niche tracking, fuel water separator marine is a $246K/yr Amazon United States market (204K searches/yr). The top 5 brands hold 72% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 64/100.

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

fuel water separator marine market data

Units sold / yr: 13K–15K; avg 250–500/product
Revenue / yr: $276K–$331K; units × avg price
Conversion rate: 5.5%
Avg BSR: #249
Page quality: 0%
Prime: 100%
Sponsored: 78%
Out of stock: 2.1%
Avg brand age: 52 months
Avg seller age: 136 days

Competition & brand share

The top 5 products take 50% of clicks — established leaders, but buyers still shop beyond them.

Brands

24 rising

Sellers

139

Top-5 brand share

72%

Top 20: 97%

Top-5 click share

50%

Top 20: 85%

Open market

24%

TRSCJXN20%
Quicksilver19%
CARMOCAR15%
attwood13%
Sierra5%
ATRACYPART4%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +66.6% search growth over the last 90 days.

Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 2.7×

Open Trend

Top fuel water separator marine search terms

fuel water separator marine38K/yr +88.7%4.2% conv.
fuel water separator25K/yr +27.0%2.5% conv.
marine fuel water separator18K/yr +59.7%3.3% conv.
water separator fuel filter16K/yr +22.5%3.5% conv.
mercury fuel filter13K/yr +62.7%5.0% conv.
marine fuel filter12K/yr +97.4%4.2% conv.
boat fuel filter10K/yr +115.8%3.7% conv.
automotive replacement fuel & water separators9K/yr +22.5%0.8% conv.
water fuel separator for boats7K/yr +97.6%6.1% conv.
mercury outboard fuel filter7K/yr +88.9%4.2% conv.

All search terms

Top fuel water separator marine 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Quicksilver 802893Q01 Water Separating Fuel Filter for Mercury and Mariner Outboards MerCruiser Sterndrive and Inboard Engines

Quicksilver$14.084.8★4,370 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

CARMOCAR Fuel Filter Water Separator replacement for Marine Outboard Motor Mercury with 3/8 Barb x 1/4 NPT brass Fittings Replaces# S3213 S3214 35-60494-1 S3213 18-7932-1 18-17928 35-809097

CARMOCAR$30.144.4★580 rev

Attwood 11840-7 Universal 10-Micron Marine Fuel/Water Separator Kit Includes Bracket & Brass Fittings Replaces Mercury 35-60494A4 For 2 & 4 Cycle Engines

attwood$23.144.6★175 rev

R12T Marine Fuel Water Separator Filter Kit 10 Micron Replacement for S3240 120AT 18-7987 NPT ZG1/4-19 Fits Gasoline and Diesel Outboard Engines Includes 2 Fittings and 2 Plugs

TRSCJXN$18.554.6★55 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

R12T Marine Fuel Water Separator Filter Kit 10 Micron Replacement for S3240 120AT 18-7987 NPT ZG1/4-19 Fits Gasoline and Diesel Outboard Engines Includes 2 Fittings and 2 Plugs

TRSCJXN$18.5555 rev

8mo 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

AUIVERED R12T Marine Fuel Water Separator Kit 10 Micron Filter Replace S3240 120AT Fit 1/4 Inch NPT Outboard Motors for Gas & Diesel Engines Includes 2 fittings 2 plugs

AUIVERED$19.8583 rev

1y ago

What buyers say about fuel water separator marine

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

What buyers love

Quality-Overall23%

“Build quality feels solid”

Size-Overall12%

“Fit perfectly”

Advertised Vs Actual Product11%

“As advertised”

Value For Money10%

“Definitely worth the money”

Filtration10%

“Good filter”

Assembly/Installation8%

“Easy to mount”

Efficiency3%

“Works good”

Leak-Proof2%

“Nothing is leaking”

Maintenance And Repair2%

“Easy replacement for my mercury 4 stroke”

Ease Of Use2%

“Easy Peasy”

What buyers complain about

Leak-Proof26%

“Leaks”

Filtration13%

“nor allow carb filter to fail”

Size-Overall10%

“Short Scres”

Quality-Overall10%

“Not sure if defect in housing or just poor quality”

Durability4%

“Didn't last a month”

Value For Money2%

“They are spendy for what it is”

Water Resistance2%

“For some reason it doesnt separate the water”

Metal Quality2%

“Metal shavings”

Material Quality2%

“Not reliable plastic”

Rusts/Corrodes2%

“Does not last I get corroded”

Top return reasons

Size-Overall55%

Compatibility-Overall10%

Advertised Vs Actual Product7%

Filtration5%

Leak-Proof5%

Defective Material/Parts5%