Is onan 4000 fuel pump profitable to sell on Amazon United States?

The niche generates $70K/yr across 22 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is +50.7%. Flapen's verdict: Worth a look (62/100).

How competitive is the onan 4000 fuel pump niche?

18 brands and 58 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 67% of demand.

What do buyers complain about in onan 4000 fuel pump?

Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Value For Money. The return rate is 1.4%.

When does demand for onan 4000 fuel pump peak?

Demand peaks in Jun–Jul–Aug; the busiest month runs 3.3× the quietest.

What does it cost to enter the onan 4000 fuel pump niche?

Listings span $13.74–$110.79; the average listing price is $38.57 (sweet spot $15–$100). The average incumbent carries 210 reviews — the moat a new listing must climb.

onan 4000 fuel pump

Worth a look

Shows a sweet-spot price point ($38.57 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Avg price

Incredible$38.57

avg listing price — sweet spot $15–$100

Review moat

Great209.55

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.4%

return rate — above 5% kills the launch gate

Price range

Great$13.74–$110.79

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

Conversion

Good6.9%

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

Growth

Good+50.7%

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

Brand share

Good67%

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Competition

Okay58%

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

Market size

Bad$70K

$70K/yr · 26K searches

According to Flapen's Amazon United States niche tracking, onan 4000 fuel pump is a $70K/yr Amazon United States market (26K searches/yr). The top 5 brands hold 67% of demand. Demand peaks in Jun–Jul–Aug. Verdict: Worth a look — 62/100.

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

onan 4000 fuel pump market data

Units sold / yr: 2K–2K; avg 0–100/product
Revenue / yr: $58K–$77K; units × avg price
Conversion rate: 6.9%
Avg BSR: #1,386
Page quality: 0%
Prime: 95%
Sponsored: 82%
Out of stock: 3.7%
Avg brand age: 34 months
Avg seller age: 181 days

Competition & brand share

The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.

Brands

18 falling

Sellers

Top-5 brand share

67%

Top 20: 100%

Top-5 click share

58%

Top 20: 98%

Open market

29%

GPS30%
partszen22%
RARAYC6%
CNRAQR5%
Podoy4%
Aspaton4%

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — +50.7% search growth over the last 90 days.

Peak months: Jun, Jul, Aug · busiest ÷ quietest = 3.3×

Open Trend

Top onan 4000 fuel pump search terms

onan 4000 fuel pump12K/yr +57.7%7.3% conv.
onan 4000 tune up kit7K/yr +44.3%3.9% conv.
onan 4000 oil change kit4K/yr +64.8%5.9% conv.
onan microquiet 4000 fuel pump2K/yr +86.3%5.4% conv.
onan generator service kit1K/yr -10.8%0.9% conv.

All search terms

Top onan 4000 fuel pump 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 22 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

partszen 149-2311 Fuel Pump with 149-2457 Fuel Filter Tune Up Kit for Onan Cummins Generator 4000 4KW Microlite MicroQuiet Generators Parts with 1403280 Air Filter

partszen$34.394.1★404 rev

GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV Generator Model KY 4000 with ONAMAX 15W40 oil for use with Spec A - N

GPS$102.944.8★71 rev

GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Cummins Onan RV Generator Model KY 4000 with ONAMAX 10W30 oil for use with Spec P - R

GPS$110.794.7★224 rev

GPS GENERATOR PARTS SPECIALIST Tune Up Kit for Onan RV generator model KY 4000 Spec A-R

GPS$69.504.7★615 rev

RARAYC 149-2311 Electric Fuel Pump and 149-2457 Fuel Filter Compatible with Onan Cummins RV 4000 4KW Microlite MicroQuiet Generator Parts

RARAYC$29.804.3★23 rev

Newest

by launch date

KAKATHU 149-2311 Fuel Pump Tune Up Kit with 149-2457 Fuel Filter & 1403280 Air Filter Compatible with Cummins Onan 3600W & 4000W MicroQuiet Microlite KY Series Gas RV Generator Replace # E11007

KAKATHU$27.422 rev

5mo ago

146-0785 Carburetor for Onan Cummins Generator 4000-Watt A042P619 A041D736 Carb with Tune-Up Kit Replaces for Microquiet 4000 Watt 4KYFA26100 4KYFA26100P 4KY26100R (Carb with Tune Up Kit)

DKIIGAME$46.354 rev

7mo ago

149-2311 Fuel Pump 149-2457 Fuel Filter 1403280 Air Filter Tune Up Kit Compatible with Cummins Onan Microlite Microquiet RV 4000 4KW Generator Parts

AULDAY$32.4112 rev

8mo ago

SIMPERAC 149-2311 Fuel Pump 149-2457 Fuel Filter for Onan 4000 Generator 3600 4000 Watts RV QG 4000 KY Microlite Microquiet Generators E11007 A029F889 A064S966 Fuel Pump Spark Plug Parts

SIMPERAC$23.9114 rev

11mo ago

LIDSCURA 149-2311 Fuel Pump and Fuel Filter Replacement for Cummins Onan QG4000 4000 4KW Replacement for Camp Power QG RV Generators Replaces 149-2457

LIDSCURA$22.7010 rev

1y ago

What buyers say about onan 4000 fuel pump

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

What buyers love

Size-Overall19%

“Perfect fit”

Value For Money15%

“Great value”

Quality-Overall14%

“The product is fairly well made”

Assembly/Installation12%

“the components are put together well”

Fuel Efficiency7%

“Generator is now more efficient”

Durability5%

“Build quality feels premium with durable materials that handle fuel blends well—no leaks or issues after months of hot Florida use”

Maintenance And Repair4%

“which makes this a practical option for anyone who performs their own generator maintenance”

Advertised Vs Actual Product4%

“As advertised”

Filtration3%

“The only think good is the air filter”

Lubrication2%

“Using the manufacturer-recommended oil just makes sense”

What buyers complain about

Functionality-Overall14%

“Did not work”

Quality-Overall12%

“They are cheap for a reason”

Value For Money9%

“Not worth the savings”

Pressure5%

“ours had too much pressure”

Durability5%

“Some last a while, some dont”

Connectivity-Overall5%

“Electrical connection for negative wire came off from inside the pump body”

Add-Ons/Attachments5%

“No means of reattaching due to the crimped end cap”

Size-Overall3%

“Fuel line was not the correct size”

Advertised Vs Actual Product3%

“The fittings include with the kit don't match the picture”

Ease Of Use3%

“The inline fuel filter of course is a bit hard to access”

Top return reasons

Size-Overall19%

Defective Material/Parts14%

Filtration12%

Leak-Proof9%

Compatibility-Overall9%

Advertised Vs Actual Product9%

Value For Money5%

Functionality-Overall5%

Assembly/Installation3%

Lubrication3%

Common questions

Is onan 4000 fuel pump profitable to sell on Amazon United States?: The niche generates $70K/yr across 22 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is +50.7%. Flapen's verdict: Worth a look (62/100).
How competitive is the onan 4000 fuel pump niche?: 18 brands and 58 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 67% of demand.
What do buyers complain about in onan 4000 fuel pump?: Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Value For Money. The return rate is 1.4%.
When does demand for onan 4000 fuel pump peak?: Demand peaks in Jun–Jul–Aug; the busiest month runs 3.3× the quietest.
What does it cost to enter the onan 4000 fuel pump niche?: Listings span $13.74–$110.79; the average listing price is $38.57 (sweet spot $15–$100). The average incumbent carries 210 reviews — the moat a new listing must climb.