diesel fuel cap
Worth a lookShows a sweet-spot price point ($18.25 avg), but a small market ($53K/yr) keeps it on the watch list.
Avg price
Great$18.25avg listing price — sweet spot $15–$100
Review moat
Great369.48avg incumbent reviews — the moat a new listing must climb
Price range
Good$7.48–$121.86cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Good62%top-5 brand share — brands hold most of the demand
Returns
Good2.4%return rate — above 5% kills the launch gate
Conversion
Good5.5%search→purchase rate — share of searches ending in a sale
Competition
Good52%top-5 click share — leaders hold, buyers still browse
Quality gap
Good4.5★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
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
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.No pronounced peak months · busiest ÷ quietest = 1.2×
Top diesel fuel cap search terms
- diesel fuel cap30K/yr
- diesel cap12K/yr
- diesel tank cap5K/yr
- diesel gas cap6K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$9.014.1★70 rev
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$11.194.9★44 rev
Gates 31835D Diesel Only Fuel Tank Cap
Gates$11.954.8★428 rev
Diesel Mens C-Seymon Multicolor Denim Baseball Cap Distressed Cotton Hat with Logo Adjustable Strap
Diesel$121.864.2★12 rev
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$10.054.6★2,831 rev
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$7.4825 rev
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$11.1944 rev
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$9.6626 rev
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$9.7528 rev
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$10.1026 rev
Trending
90-day click momentumDiesel Mens C-Seymon Multicolor Denim Baseball Cap Distressed Cotton Hat with Logo Adjustable Strap
Diesel$121.864.2★
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$11.194.9★
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$7.482.8★
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$16.704.7★
TINWID1919 Diesel Fuel Cap 2 1/4 for International Ford GMC Truck
TINWID1919$23.324.6★
What buyers say about diesel fuel cap
What buyers praise and complain about, mined from review topics.What buyers love
“Fit great”
“Good quality, easy installation”
“works as it should”
“Worth the money”
“Works fine”
“I also like that it is magnetic”
“Works great and covers fuel intake perfectly”
“Overall very easy to use”
“Easy to install”
“he loves that it helps keep the dust from the fill area”
What buyers complain about
“May not fit regardless of compatibility”
“it doesn't fit my ball”
“Cheap made”
“Did not fit my truck even though it said it would”
“Doesn't last”
“Won't work”
“This is not good for the truck as it will effect sensors”
“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”
“Yesterday, it was completely stuck, and I couldnt remove it from my Ram 3500 dually”
“it is hard to get off and back on”
Top return reasons
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.