---
title: "R12t Fuel Filter — $16K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/r12t-fuel-filter"
last_updated: "2026-08-07T21:09:48.387Z"
locale: en
meta:
description: "Niche score 50/100 · $16K/yr market · 15K searches/yr · $21.74 avg price. A small market ($16K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $16K/yr market · 15K searches/yr · $21.74 avg price. A small market ($16K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "R12t Fuel Filter — $16K/yr Amazon US Niche (2026) - Flapen"
---
# **r12t fuel filter**
**Worth a look**
Shows a sweet-spot price point ($21.74 avg), but a small market ($16K/yr) keeps it on the watch list.
Market size 4Growth 82Conversion 58Competition 21Returns 87Price range 90Avg price 92Brand share 29Review moat 89Quality gap 27
**Avg price**
**Great****$21.74**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$12.47–$50.00**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****211.94**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****1.4%**
return rate — above 5% kills the launch gate
**Growth**
**Great****+76.7%**
90-day search growth — must beat 0% to launch
**Conversion**
**Good****5.0%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****88%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****75%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$16K**
$16K/yr · 15K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, r12t fuel filter is a $16K/yr Amazon United States market (15K searches/yr). The top 5 brands hold 88% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **r12t fuel filter market data**
- **Units sold / yr**
- **2K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$43K–$54K**
- units × avg price
- **Conversion rate**
- **5.0%**
- **Avg BSR**
- **#470**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **5.1%**
- **Avg brand age**
- **52 months**
- **Avg seller age**
- **211 days**
## **Competition & brand share**
The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**10 **▼falling
**Sellers**
**12**
**Top-5 brand share**
**88%**
Top 20: 100%
**Top-5 click share**
**75%**
Top 20: 100%
**Open market**
**8%**
- TRSCJXN38% - DZFST.FI19% - CARMOCAR19% - AUIVERED7% - AULDAY5% - Hoypeyfiy4% - Open — no brand owns it (4 brands, 8%)
## **Demand**
Weekly Amazon search volume, last 9 weeks — +76.7% search growth over the last 90 days.
1K600May '26May '26May '26May '26Jun '26Jun '26Jun '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/us/automotive/r12t-fuel-filter/trend)
## **Top r12t fuel filter search terms**
- **r12t fuel filter**9K/yr+50.0%8.1% conv. - **r12t fuel filter/water separator**3K/yr+359.3%11.7% conv. - **r12t**3K/yr+22.0%10.0% conv. [**All search terms **](https://flapen.com/research/us/automotive/r12t-fuel-filter/search-terms)
## **Top r12t fuel 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.
0%10%$2K20%$3K30%$5K40%$6K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**$18.55**4.6★55 rev](https://www.amazon.com/dp/B0FQTH3XQP) [2**DZFST.FI R12T Fuel Filter Water Separator Spin-on R12T Filter with Water Collection Bowl Diesel Engine & Gasoline Engine Replaces# S3240 R12T 120AT 18-7987 NPT ZG1/4-19**DZFST.FI**$16.97**4.6★70 rev](https://www.amazon.com/dp/B0CBMGJGTT) [3**R12T Fuel Filter Water Separator with Clear Nylon Collection Bowl 3/8 Inch NPT Spin-on Assembly Replaces S3240 120AT 18-7947 18-7987 NPT ZG1/4-19**TRSCJXN**$14.30**5.0★4 rev](https://www.amazon.com/dp/B0H19XV81V) [4**CARMOCAR Marine Fuel Water Separator Element of R12T Water Separator 120AT NPT ZG1/4-19 for Marine Engine S3240 120AT 18-7947 35-60494-1**CARMOCAR**$12.47**4.7★35 rev](https://www.amazon.com/dp/B0CZLFBNPY) [5**CARMOCAR Marine Fuel Water Separator/Diesel Fuel Filter/Water Separator for R12T MARINE SPIN-ON HOUSING 120AT NPT ZG1/4-19 Includes 2 fittings 2 plugs**CARMOCAR**$21.77**4.3★337 rev](https://www.amazon.com/dp/B07KTMH7QQ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**R12T Fuel Filter Water Separator with Clear Nylon Collection Bowl 3/8 Inch NPT Spin-on Assembly Replaces S3240 120AT 18-7947 18-7987 NPT ZG1/4-19**TRSCJXN**$14.30**4 rev4w ago](https://www.amazon.com/dp/B0H19XV81V) [**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**$18.55**55 rev8mo ago](https://www.amazon.com/dp/B0FQTH3XQP) [**AUIVERED R12T Fuel Filter Water Separator Element - 120AT NPT ZG1/4-19 Automotive Part Fits Marine Diesel Engine - Replaces S3240 18-7947**AUIVERED**$12.76**16 rev9mo ago](https://www.amazon.com/dp/B0FMNMW7Z8) [**AUIVERED R12T Fuel Filter Water Separator with Collection Bowl- Replaces# S3240 R12T 120AT 18-7987 NPT ZG1/4-19 Automotive Parts with Fitting**AUIVERED**$16.05**18 rev1y ago](https://www.amazon.com/dp/B0F8YNFKCS) [**4PCS R12T Fuel Filter Water Separator With Water Collection Bowl Fits for Diesel Engine & Gasoline Engine Replaces# S3240 R12T 120AT 18-7987 NPT ZG1/4-19**AULDAY**$39.71**7 rev1y ago](https://www.amazon.com/dp/B0F2TDWKCS)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**R12T Fuel Filter Water Separator with Clear Nylon Collection Bowl 3/8 Inch NPT Spin-on Assembly Replaces S3240 120AT 18-7947 18-7987 NPT ZG1/4-19**TRSCJXN**$14.30**5.0★**▲ 161%**](https://www.amazon.com/dp/B0H19XV81V) [**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**$18.55**4.6★**▲ 92%**](https://www.amazon.com/dp/B0FQTH3XQP) [**AUIVERED R12T Fuel Filter Water Separator with Collection Bowl- Replaces# S3240 R12T 120AT 18-7987 NPT ZG1/4-19 Automotive Parts with Fitting**AUIVERED**$16.05**4.8★**▲ 71%**](https://www.amazon.com/dp/B0F8YNFKCS) [**ACA R12T Marine Fuel Separator with Collection Bowl 1/4 NPT**ACA**$13.22**4.5★**▲ 60%**](https://www.amazon.com/dp/B0BJCLFRLW) [**AUIVERED R12T Fuel Filter Water Separator Element - 120AT NPT ZG1/4-19 Automotive Part Fits Marine Diesel Engine - Replaces S3240 18-7947**AUIVERED**$12.76**4.4★**▲ 23%**](https://www.amazon.com/dp/B0FMNMW7Z8)
**~~View all trending →~~**
## **What buyers say about r12t fuel filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**17%
*“Great fuel filter”*
**Quality-Overall**17%
*“construction over all is very good”*
**Value For Money**13%
*“Definitely worth the money”*
**Assembly/Installation**12%
*“Installation was straightforward”*
**Size-Overall**10%
*“fits perfectly”*
**Maintenance And Repair**3%
*“It made a good modification for my BX 25d Kubota tractor”*
**Leak-Proof**3%
*“This filter doesn't leak”*
**Fuel Efficiency**2%
*“Great quality fuel/water separator”*
**Durability**2%
*“Its very durable and zero issues”*
**Advertised Vs Actual Product**2%
*“As advertised”*
### **What buyers complain about **
**Leak-Proof**20%
*“The clear bowl on the bottom of the filter continually leaked fuel”*
**Filtration**16%
*“Tried everything to get it undone with breaking it and nothing worked, which means when it's time to change out the filter, both the filter and the catch bowl assembly will have to be repurchased”*
**Size-Overall**10%
*“MISSING FITTINGS”*
**Material Quality**7%
*“Not reliable plastic”*
**Durability**6%
*“7 of them broke trying to affix a fuel hose to a gas tank”*
**Instructions/User Manual/Troubleshooting**3%
*“WHY NO INSTRUCTIONS AS TO HOW TO USE”*
**Quality-Overall**2%
*“Three are cheap trash”*
**Pressure**2%
*“they tension gear breaks at the least amount of pressure you apply”*
**Fuel Efficiency**1%
*“Bad fuel is a fuel injection systems worst enemy”*
**Maintenance And Repair**1%
*“time consuming to repair”*
### **Top return reasons **
**Size-Overall**57%
**Filtration**9%
**Leak-Proof**9%
**Compatibility-Overall**8%
**Quality-Overall**5%
**Functionality-Overall**3%
**Defective Material/Parts**2%
**Mounting**2%
**Ease Of Use**1%
**Assembly/Installation**1%
## **Common questions**
- **Is r12t fuel filter profitable to sell on Amazon United States?**
- The niche generates $16K/yr across 16 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +76.7%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the r12t fuel filter niche?**
- 10 brands and 12 sellers compete. The top 5 products take 75% of clicks and top 5 brands hold 88% of demand.
- **What do buyers complain about in r12t fuel filter?**
- Top complaints mined from reviews: Leak-Proof, Filtration, Size-Overall. The return rate is 1.4%.
- **What does it cost to enter the r12t fuel filter niche?**
- Listings span $12.47–$50.00; the average listing price is $21.74 (sweet spot $15–$100). The average incumbent carries 212 reviews — the moat a new listing must climb.
## **Related niches in Automotive**
- 72 [**brake bleeder kit**](https://flapen.com/research/us/automotive/brake-bleeder-kit)$2.2M/yr+8.2%**Launch it**- 72 [**gas can pump**](https://flapen.com/research/us/automotive/gas-can-pump)$1.7M/yr+20.1%**Launch it**- 72 [**dewalt hedge trimmer**](https://flapen.com/research/us/automotive/dewalt-hedge-trimmer)$1.6M/yr+158.2%**Launch it**- 72 [**iron eraser**](https://flapen.com/research/us/automotive/iron-eraser)$107K/yr>1,000%**Worth a look**- 72 [**marine fuel line**](https://flapen.com/research/us/automotive/marine-fuel-line)$198K/yr+104.3%**Worth a look**- 72 [**garden hose filter**](https://flapen.com/research/us/automotive/garden-hose-filter)$729K/yr+110.7%**Worth a look**[**All Automotive niches **](https://flapen.com/research/us/automotive)