---
title: "Diesel Fuel Cap — $53K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/diesel-fuel-cap"
last_updated: "2026-08-10T19:59:33.357Z"
locale: en
meta:
description: "Niche score 50/100 · $53K/yr market · 53K searches/yr · $18.25 avg price. A small market ($53K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $53K/yr market · 53K searches/yr · $18.25 avg price. A small market ($53K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Diesel Fuel Cap — $53K/yr Amazon US Niche (2026) - Flapen"
---
# **diesel fuel cap**
**Worth a look**
Shows a sweet-spot price point ($18.25 avg), but a small market ($53K/yr) keeps it on the watch list.
Market size 13Growth 21Conversion 62Competition 55Returns 66Price range 74Avg price 83Brand share 72Review moat 82Quality gap 50
**Avg price**
**Great****$18.25**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****369.48**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Good****$7.48–$121.86**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****62%**
top-5 brand share — brands hold most of the demand
**Returns**
**Good****2.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Good****5.5%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Good****52%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Good****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-7.8%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$53K**
$53K/yr · 53K 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, diesel fuel cap is a $53K/yr Amazon United States market (53K searches/yr). The top 5 brands hold 62% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diesel fuel cap market data**
- **Units sold / yr**
- **3K–4K**
- avg 100–250/product
- **Revenue / yr**
- **$55K–$73K**
- units × avg price
- **Conversion rate**
- **5.5%**
- **Avg BSR**
- **#1,076**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **86%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **41 months**
- **Avg seller age**
- **157 days**
## **Competition & brand share**
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**19 **▼falling
**Sellers**
**35**
**Top-5 brand share**
**62%**
Top 20: 100%
**Top-5 click share**
**52%**
Top 20: 91%
**Open market**
**33%**
- Manymiba21% - YUESHAN15% - JOJOY LUX9% - Gates9% - Diesel8% - TINWID19195%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -7.8% search growth over the last 90 days.
2K1KHoliday '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.2×
[**Open Trend **](https://flapen.com/research/us/automotive/diesel-fuel-cap/trend)
## **Top diesel fuel cap search terms**
- **diesel fuel cap**30K/yr-9.5%5.8% conv. - **diesel cap**12K/yr-2.9%4.6% conv. - **diesel tank cap**5K/yr-5.0%3.5% conv. - **diesel gas cap**6K/yr-11.8%7.6% conv. [**All search terms **](https://flapen.com/research/us/automotive/diesel-fuel-cap/search-terms)
## **Top diesel fuel cap 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%4%$2K8%$4K12%$6K16%$8K101001K10K 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**Diesel Gas Cap Diesel Fuel Cap for Ford FC1068 8C3Z-9030-C Replacement for 2008-2017 Ford F250 F350 F450 F550 Super Duty 6.4L 6.7L 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017**Manymiba**$9.01**4.1★70 rev](https://www.amazon.com/dp/B0DK4Z3P9C) [2**YUESHAN 2pcs Fuel Fill Cap 6661114 Compatible for Bobcat A770 730 742 743 751 753 763 773 7753 863 873 883 963 S510 S530 S630 S750 T110 T140 T180 T190 T200 T250 T300 T320 T630 T650 T750 T770 T870**YUESHAN**$11.19**4.9★44 rev](https://www.amazon.com/dp/B0FMFDTNLR) [3**Gates 31835D Diesel Only Fuel Tank Cap**Gates**$11.95**4.8★428 rev](https://www.amazon.com/dp/B009CLD1PO) [4**Diesel Mens C-Seymon Multicolor Denim Baseball Cap Distressed Cotton Hat with Logo Adjustable Strap**Diesel**$121.86**4.2★12 rev](https://www.amazon.com/dp/B09XZZ4T54) [5**Diesel Fuel Cap for Ram and GM 3.0L Duramax-Updated Larger Magnetic Aluminum Tank Gas Cap fit 2013-2018 Ram 1500 2500 3500 2019-2024 GM Pick-up Truck Accessories Replacement Eco Tanks Magnetic Green**JOJOY LUX**$10.05**4.6★2,831 rev](https://www.amazon.com/dp/B0DCNKM1X5)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**FALVFUN Car Diesel Gas Cap Vehicle Diesel Fuel Tank Cap with Anti-Lost Rope OEM#8C3Z-9030-C Automotive Replacement Accessories Compatible with F250 F350 F450 F550 Super Duty**FALVFUN**$7.48**25 rev9mo ago](https://www.amazon.com/dp/B0FV8YY6SR) [**YUESHAN 2pcs Fuel Fill Cap 6661114 Compatible for Bobcat A770 730 742 743 751 753 763 773 7753 863 873 883 963 S510 S530 S630 S750 T110 T140 T180 T190 T200 T250 T300 T320 T630 T650 T750 T770 T870**YUESHAN**$11.19**44 rev10mo ago](https://www.amazon.com/dp/B0FMFDTNLR) [**Diesel Gas Cap Diesel Fuel Cap For Ford Chevy Toyota Dodge Jeep GMC Buick Cadillac Lincoln Mercury Oldsmobile Pontiac Volvo F250 F350 F450 F550 E450 E550 Silverado 2500 3500 Express Suburban 10830D**Manymiba**$9.66**26 rev1y ago](https://www.amazon.com/dp/B0F9ZS12X1) [**Diesel Gas Cap Diesel Fuel Cap for 2007-2021 Dodge Ram 2500 3500 4500 5500 2014-2016 Ram ProMaster 1500 2500 3500 Jeep 2007-2014 Grand Cherokee 2018-2022 Wrangler 2005-2006 Liberty 52013994AB**Manymiba**$9.75**28 rev1y ago](https://www.amazon.com/dp/B0F67B5F6T) [**10830D Diesel Fuel Cap For Chevy Dodge Ford GMC Buick Cadillac Jeep Lincoln Mercury Oldsmobile Pontiac Volvo Toyota - Silverado 2500 3500 Express Suburban F250 F350 F450 F550 E450 E550 Savana Sierra**ROVIKE**$10.10**26 rev1y ago](https://www.amazon.com/dp/B0F1MS5TKN)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Diesel Mens C-Seymon Multicolor Denim Baseball Cap Distressed Cotton Hat with Logo Adjustable Strap**Diesel**$121.86**4.2★**▲ 251%**](https://www.amazon.com/dp/B09XZZ4T54) [**YUESHAN 2pcs Fuel Fill Cap 6661114 Compatible for Bobcat A770 730 742 743 751 753 763 773 7753 863 873 883 963 S510 S530 S630 S750 T110 T140 T180 T190 T200 T250 T300 T320 T630 T650 T750 T770 T870**YUESHAN**$11.19**4.9★**▲ 115%**](https://www.amazon.com/dp/B0FMFDTNLR) [**FALVFUN Car Diesel Gas Cap Vehicle Diesel Fuel Tank Cap with Anti-Lost Rope OEM#8C3Z-9030-C Automotive Replacement Accessories Compatible with F250 F350 F450 F550 Super Duty**FALVFUN**$7.48**2.8★**▲ 64%**](https://www.amazon.com/dp/B0FV8YY6SR) [**Transfer Tank Cap Vented Diesel Fuel Cap Gas Venting Pressure Tank Lid for 2 Inch Base Diesel Fuel Fill Lid for Auxiliary/Storage Truck Tool Box**JYINCPED**$16.70**4.7★**▲ 35%**](https://www.amazon.com/dp/B0D1Y3ZVRN) [**TINWID1919 Diesel Fuel Cap 2 1/4 for International Ford GMC Truck**TINWID1919**$23.32**4.6★**▲ 19%**](https://www.amazon.com/dp/B0CH67KD78)
**~~View all trending →~~**
## **What buyers say about diesel fuel cap**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**47%
*“Fit great”*
**Quality-Overall**16%
*“Good quality, easy installation”*
**Advertised Vs Actual Product**7%
*“works as it should”*
**Value For Money**4%
*“Worth the money”*
**Efficiency**4%
*“Works fine”*
**Magnetic Strength/Adsorption**4%
*“I also like that it is magnetic”*
**Fuel Efficiency**3%
*“Works great and covers fuel intake perfectly”*
**Ease Of Use**3%
*“Overall very easy to use”*
**Assembly/Installation**2%
*“Easy to install”*
**Ease Of Cleaning**1%
*“he loves that it helps keep the dust from the fill area”*
### **What buyers complain about **
**Compatibility-Overall**20%
*“May not fit regardless of compatibility”*
**Size-Overall**17%
*“it doesn't fit my ball”*
**Quality-Overall**14%
*“Cheap made”*
**Advertised Vs Actual Product**11%
*“Did not fit my truck even though it said it would”*
**Durability**7%
*“Doesn't last”*
**Functionality-Overall**4%
*“Won't work”*
**Sensor**4%
*“This is not good for the truck as it will effect sensors”*
**Design-Overall**4%
*“Poor design do not purchase, Poor design, o-rings are the only thing holding this in place and they are not secure actually leaving crack”*
**Jamming/Clogging**4%
*“Yesterday, it was completely stuck, and I couldnt remove it from my Ram 3500 dually”*
**Ease Of Use**2%
*“it is hard to get off and back on”*
### **Top return reasons **
**Size-Overall**70%
**Compatibility-Overall**14%
**Advertised Vs Actual Product**3%
**Mechanism Issues**3%
**Functionality-Overall**2%
**Defective Material/Parts**2%
**Magnetic Strength/Adsorption**1%
**Value For Money**1%
**Leak-Proof**1%
**Product Condition**1%
## **Common questions**
- **Is diesel fuel cap profitable to sell on Amazon United States?**
- The niche generates $53K/yr across 29 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -7.8%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the diesel fuel cap niche?**
- 19 brands and 35 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 62% of demand.
- **What do buyers complain about in diesel fuel cap?**
- Top complaints mined from reviews: Compatibility-Overall, Size-Overall, Quality-Overall. The return rate is 2.4%.
- **When does demand for diesel fuel cap peak?**
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- **What does it cost to enter the diesel fuel cap niche?**
- Listings span $7.48–$121.86; the average listing price is $18.25 (sweet spot $15–$100). The average incumbent carries 369 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)