---
title: "r12t fuel filter — Niche Verdict: Worth a look (50/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/r12t-fuel-filter"
last_updated: "2026-07-13T19:52:27.697Z"
locale: en
meta:
  description: "r12t fuel filter shows a sweet-spot price point ($21.74 avg), but a small market ($16K/yr) keeps it on the watch list."
  "og:description": "r12t fuel filter shows a sweet-spot price point ($21.74 avg), but a small market ($16K/yr) keeps it on the watch list."
  "og:title": "r12t fuel filter — Niche Verdict: Worth a look (50/100) | Amazon United States - Flapen"
---

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# **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 6% 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

## **Competition**

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%**

**Open market**

**8%**

- TRSCJXN38% - DZFST.FI19% - CARMOCAR19% - AUIVERED7% - AULDAY5% - Hoypeyfiy4% - Open — no brand owns it (4 brands, 8%)

## **Product shelf**

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](https://m.media-amazon.com/images/I/411zHhOgagL.jpg)**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](https://m.media-amazon.com/images/I/41GB-xhjLJL.jpg)**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](https://m.media-amazon.com/images/I/41TK6x2TnML.jpg)**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](https://m.media-amazon.com/images/I/31o0cwfxBKL.jpg)**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](https://m.media-amazon.com/images/I/41fKISIQWyL.jpg)**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](https://m.media-amazon.com/images/I/41TK6x2TnML.jpg)**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](https://m.media-amazon.com/images/I/411zHhOgagL.jpg)**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](https://m.media-amazon.com/images/I/41-WGcAFDQL.jpg)**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](https://m.media-amazon.com/images/I/312+EcHy98L.jpg)**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](https://m.media-amazon.com/images/I/41RPZDkAUuL.jpg)**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](https://m.media-amazon.com/images/I/41TK6x2TnML.jpg)**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](https://m.media-amazon.com/images/I/411zHhOgagL.jpg)**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](https://m.media-amazon.com/images/I/312+EcHy98L.jpg)**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](https://m.media-amazon.com/images/I/41cw7pMuIGL.jpg)**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](https://m.media-amazon.com/images/I/41-WGcAFDQL.jpg)**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 →~~**

## **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

## **Reviews**

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%