---
title: "diesel fuel cap — Niche Verdict: Worth a look (50/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/diesel-fuel-cap"
last_updated: "2026-07-14T00:30:21.308Z"
locale: en
meta:
  description: "diesel fuel cap shows a sweet-spot price point ($18.25 avg), but a small market ($53K/yr) keeps it on the watch list."
  "og:description": "diesel fuel cap shows a sweet-spot price point ($18.25 avg), but a small market ($53K/yr) keeps it on the watch list."
  "og:title": "diesel fuel cap — Niche Verdict: Worth a look (50/100) | Amazon United States - Flapen"
---

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# **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 6% 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

## **Competition**

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%**

**Open market**

**33%**

- Manymiba21% - YUESHAN15% - JOJOY LUX9% - Gates9% - Diesel8% - TINWID19195%

## **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%4%$2K8%$4K12%$6K16%$8K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 29 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](https://m.media-amazon.com/images/I/31eExwPWawL.jpg)**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](https://m.media-amazon.com/images/I/31c4uykZ3+L.jpg)**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](https://m.media-amazon.com/images/I/41GWhsbCRjL.jpg)**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](https://m.media-amazon.com/images/I/21K0yDZWRyL.jpg)**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](https://m.media-amazon.com/images/I/31QwtP1HAXL.jpg)**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](https://m.media-amazon.com/images/I/310h68PmpNL.jpg)**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](https://m.media-amazon.com/images/I/31c4uykZ3+L.jpg)**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) [![YUESHAN Diesel Gas Cap Fuel Cap Compatible with Chevy Silverado 2500HD 3500HD2012-2014Suburban2500 2012-2013GMC Sierra 2500HD 3500HD2012-2014Yukon XL25002012-2013Replace # GT348 20971566](https://m.media-amazon.com/images/I/21C4iVbE2UL.jpg)**YUESHAN Diesel Gas Cap Fuel Cap Compatible with Chevy Silverado 2500HD 3500HD2012-2014Suburban2500 2012-2013GMC Sierra 2500HD 3500HD2012-2014Yukon XL25002012-2013Replace # GT348 20971566**YUESHAN**$11.75**14 rev1y ago](https://www.amazon.com/dp/B0FG1HS76B) [![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](https://m.media-amazon.com/images/I/41ovDHPCEjL.jpg)**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](https://m.media-amazon.com/images/I/41CdrWIr33L.jpg)**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)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Diesel Mens C-Seymon Multicolor Denim Baseball Cap Distressed Cotton Hat with Logo Adjustable Strap](https://m.media-amazon.com/images/I/21K0yDZWRyL.jpg)**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) [![Diesel Fuel Cap Aluminum Billet Fuel Tank Cap & DEF Exhaust Fluid Cap Magnetic Fuel Cap Gas Cap Replacement Compatible with Dodge RAM 1500 2500 3500 Trucks (2013-2019)](https://m.media-amazon.com/images/I/41Gyw8eqRsL.jpg)**Diesel Fuel Cap Aluminum Billet Fuel Tank Cap & DEF Exhaust Fluid Cap Magnetic Fuel Cap Gas Cap Replacement Compatible with Dodge RAM 1500 2500 3500 Trucks (2013-2019)**ecocstm**$10.17**4.7★**▲ 163%**](https://www.amazon.com/dp/B0DM8SDCWC) [![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](https://m.media-amazon.com/images/I/31c4uykZ3+L.jpg)**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](https://m.media-amazon.com/images/I/310h68PmpNL.jpg)**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](https://m.media-amazon.com/images/I/31J90ofX1EL.jpg)**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)

**~~View all trending →~~**

## **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×

## **Reviews**

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%