---
title: "Primer Bulb — $144K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/primer-bulb"
last_updated: "2026-08-10T17:53:44.038Z"
locale: en
meta:
description: "Niche score 65/100 · $144K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 65/100 · $144K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Primer Bulb — $144K/yr Amazon US Niche (2026) - Flapen"
---
# **primer bulb**
**Worth a look**
Shows low returns (1.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 31Growth 79Conversion 80Competition 78Returns 95Price range 40Avg price 24Brand share 84Review moat 74Quality gap 35
**Returns**
**Incredible****1.0%**
return rate — above 5% kills the launch gate
**Brand share**
**Great****51%**
top-5 brand share — no brand owns this niche
**Conversion**
**Great****8.3%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Great****+70.0%**
90-day search growth — must beat 0% to launch
**Competition**
**Great****37%**
top-5 click share — an open shelf
**Review moat**
**Good****524.31**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Okay****$4.09–$22.42**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****$144K**
$144K/yr · 199K searches
**Avg price**
**Bad****$8.78**
avg listing price — sweet spot $15–$100
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, primer bulb is a $144K/yr Amazon United States market (199K searches/yr). The top 5 brands hold 51% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 65/100.
Data updated Jul 16, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **primer bulb market data**
- **Units sold / yr**
- **15K–20K**
- avg 250–500/product
- **Revenue / yr**
- **$132K–$176K**
- units × avg price
- **Conversion rate**
- **8.3%**
- **Avg BSR**
- **#457**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **96%**
- **Out of stock**
- **1.3%**
- **Avg brand age**
- **47 months**
- **Avg seller age**
- **175 days**
## **Competition & brand share**
Clicks spread well past the top 5 (37% combined) — an open shelf where new products get seen.
**Brands**
**27 **▲rising
**Sellers**
**90**
**Top-5 brand share**
**51%**
Top 20: 95%
**Top-5 click share**
**37%**
Top 20: 78%
**Open market**
**43%**
- HUSWELL15% - Uorimy11% - GTTYD9% - Bullwall8% - JRL7% - attwood7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +70.0% search growth over the last 90 days.
6K4KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 2.8×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/primer-bulb/trend)
## **Top primer bulb search terms**
- **primer bulb**67K/yr+66.1%6.8% conv. - **primer bulbs for small engines**42K/yr+76.6%7.5% conv. - **fuel primer bulb**13K/yr+28.8%7.5% conv. - **weedeater primer bulb**9K/yr+175.4%4.0% conv. - **primer bulb for weedeater**9K/yr+149.4%7.6% conv. - **primer bulbs**8K/yr+60.5%7.3% conv. - **weed eater primer bulb**6K/yr+124.5%7.1% conv. - **small engine primer bulb**6K/yr+62.9%6.3% conv. - **fuel line primer bulb**5K/yr+21.6%6.1% conv. - **carburetor primer bulb**4K/yr+93.5%4.9% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/primer-bulb/search-terms)
## **Top primer bulb 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.
0%3%$4K6%$9K9%$13K12%$17K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**5 Pack 0057003 Primer Bulb Compatible with Zama 0057004 Echo 12538108660 Poulan Crafstman Weedeater Chainsaw 530071835 530 071835 Walbro Stens Ryobi 188-512-1 Wyj-86 791-683974 B 683974 615-764**GTTYD**$4.97**4.6★673 rev](https://www.amazon.com/dp/B0C1VB88S6) [2**Uorimy 188-12-1 0057003 0057004 Primer Bulb Pump for 2 Cycle Small Engine String Trimmer Weed Eater Chainsaw Leaf Blower Replace Zama188-12-1 0057003 0057004 Echo 12538108660 12318140630**Uorimy**$6.08**4.7★364 rev](https://www.amazon.com/dp/B0D78F677Q) [3**HUSWELL 188-12-1 0057003 0057004 Primer Bulb Pump Bulbs for Sthil 41331212700 Homelite 01201 UP04802 Echo 12318140630 and Homelite Echo Stihl Robi Zama Primer Pouland 561635001 A01195A**HUSWELL**$4.81**4.6★449 rev](https://www.amazon.com/dp/B0C9GDDLR2) [4**Missiscily 4-Pack 0057003 0057004 Carburetor Primer Bulb Replacement for Homelite Echo Stihl Robi Zama Primer Pouland 561635001 A01195A 0058001 12538108660**Missiscily**$5.38**4.6★1,053 rev](https://www.amazon.com/dp/B09JZPJZPT) [5**HUSWELL 188-12-1 0057003 0057004 Primer Bulb Pump Bulb for 2 Cycle Small Engine String Trimmer Weed Eater Chainsaw Leaf Blower**HUSWELL**$6.47**4.5★134 rev](https://www.amazon.com/dp/B0CP277BFT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Bullwall 4 Pcs 188-13 0057004 Primer Bulbs Compatible with Small Engine Echo STHIL Ryobi Homelite Poulan Husqvarna Trimmer WeedEater Leaf Blower Hedge Chainsaw Model Primer Bulb**Bullwall**$6.77**127 rev7mo ago](https://www.amazon.com/dp/B0G419S7GT) [**Bullwall 4 Pcs 188-512 Primer Bulbs Compatible with Small Engine Husqvarna Craftsman Homelite Ryobi Poulan Sthil Echo Chainsaw Blower String Trimmer Models 503936601 12318139130 Snap in Primer Bulb**Bullwall**$6.77**127 rev7mo ago](https://www.amazon.com/dp/B0G3ZRXMXC) [**kakufunny Fuel Line with Bulb 5/16inch(8mm) Boat Fuel Primer Bulb for Boat Motor & Marine Outboard High Flow Manual Hand Pump for Gasoline Diesel Oil Transfer & Emergency Priming(7ft)**kakufunny**$15.55**30 rev8mo ago](https://www.amazon.com/dp/B0G2Q7Z9C8) [**CutCrafter 188-12-1Small Primer Bulb 0057003 0057004 Big Primer Bulb for 2 Cycle Small Engine Weed Eater Chainsaw Leaf Blower Replace**CutCrafter**$5.10**7 rev8mo ago](https://www.amazon.com/dp/B0FY6Y48NY) [**ZNBSIXP 10 Pack Carburetor Primer Bulb for Stihl FS55 FS55R FS56RC FS70 FS80R FS85 FS90 FS90R FS91 FS91R FS110 FS111 FS130R FS40C FS45 BG55 BG56C BG65 BG75 BG85 BG86 0057003 0057004 String Trimmer**ZNBSIXP**$6.02**142 rev1y ago](https://www.amazon.com/dp/B0FGDD6798)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Podoy 4226 121 2700 Prime Bulb Compatible with Stihl Homelite Echo Robi Zama 0057003 0057004 0058001 FS45 FS46 FS55 FS55R FS72 FS80 FS85 FS87 BG55 BG56 BG65 BG75 BG85 BG86 String Trimmer (10 Pack)**Podoy**$6.72**4.7★**▲ 129%**](https://www.amazon.com/dp/B012W9DAVW) [**CutCrafter 188-12-1Small Primer Bulb 0057003 0057004 Big Primer Bulb for 2 Cycle Small Engine Weed Eater Chainsaw Leaf Blower Replace**CutCrafter**$5.10**4.4★**▲ 118%**](https://www.amazon.com/dp/B0FY6Y48NY) [**Bullwall 4 Pcs 188-13 0057004 Primer Bulbs Compatible with Small Engine Echo STHIL Ryobi Homelite Poulan Husqvarna Trimmer WeedEater Leaf Blower Hedge Chainsaw Model Primer Bulb**Bullwall**$6.77**4.4★**▲ 94%**](https://www.amazon.com/dp/B0G419S7GT) [**Bullwall 4 Pcs 188-512 Primer Bulbs Compatible with Small Engine Husqvarna Craftsman Homelite Ryobi Poulan Sthil Echo Chainsaw Blower String Trimmer Models 503936601 12318139130 Snap in Primer Bulb**Bullwall**$6.77**4.4★**▲ 90%**](https://www.amazon.com/dp/B0G3ZRXMXC) [**Wanotine 10-Packs Primer Bulb for Stihl FS90 FS90R FS55 FS55R FS56RC FS70R FS80R FS85 FS91R FS110 FS130 FS130R FS40 FS45 BG50 BG55 BG56 BG65 BG75 BG85 BG86 Replace 4226 121 2700**Wanotine**$10.04**4.6★**▲ 85%**](https://www.amazon.com/dp/B0C14CS7JT)
**~~View all trending →~~**
## **What buyers say about primer bulb**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**23%
*“Fit and worked as expected”*
**Value For Money**15%
*“Great Value”*
**Quality-Overall**15%
*“Great replacement & quality”*
**Advertised Vs Actual Product**12%
*“As advertised”*
**Efficiency**6%
*“WORKS WELL”*
**Assembly/Installation**5%
*“Easy install”*
**Maintenance And Repair**3%
*“Great Price for this repair kit”*
**Ease Of Use**2%
*“Easy to use”*
**Leak-Proof**2%
*“No leaks and easy to install”*
**Durability**2%
*“very durable”*
### **What buyers complain about **
**Size-Overall**19%
*“TOO SMALL”*
**Durability**18%
*“Broken”*
**Quality-Overall**8%
*“Poor quality product”*
**Leak-Proof**5%
*“developed a leak”*
**Advertised Vs Actual Product**4%
*“I would call this misleading and misinformation”*
**Functionality-Overall**4%
*“Did not work for me”*
**Material Quality**3%
*“The material feels slightly firmer than the original OEM bulbs”*
**Rubber Quality**3%
*“Super thin rubber”*
**Thickness**3%
*“Not very thick”*
**Maintenance And Repair**2%
*“need to be replaced”*
### **Top return reasons **
**Size-Overall**77%
**Advertised Vs Actual Product**6%
**Functionality-Overall**4%
**Defective Material/Parts**3%
**Compatibility-Overall**2%
**Leak-Proof**1%
**Value For Money**1%
**Quality-Overall**1%
**Material Quality**1%
**Connectivity-Overall**1%
## **Common questions**
- **Is primer bulb profitable to sell on Amazon United States?**
- The niche generates $144K/yr across 45 tracked products. 2 of 6 products launched in the last 360 days are still selling. 90-day search growth is +70.0%. Flapen's verdict: Worth a look (65/100).
- **How competitive is the primer bulb niche?**
- 27 brands and 90 sellers compete. The top 5 products take 37% of clicks and top 5 brands hold 51% of demand.
- **What do buyers complain about in primer bulb?**
- Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 1.0%.
- **When does demand for primer bulb peak?**
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 2.8× the quietest.
- **What does it cost to enter the primer bulb niche?**
- Listings span $4.09–$22.42; the average listing price is $8.78 (sweet spot $15–$100). The average incumbent carries 524 reviews — the moat a new listing must climb.
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