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52

auxiliary fuel tank diesel truck

Worth a look

Shows a thin review moat (49 avg reviews), but pricing outside the sweet spot ($805.64 avg) keeps it on the watch list.

Market size 27Growth 25Conversion 2Competition 95Returns 83Price range 0Avg price 0Brand share 71Review moat 98Quality gap 95

Review moat

Incredible49.14

avg incumbent reviews — the moat a new listing must climb

Competition

Incredible19%

top-5 click share — an open shelf

Quality gap

Incredible4.0★

avg incumbent rating — lower means beatable quality

Returns

Great1.6%

return rate — above 6% kills the launch gate

Brand share

Good62%

top-5 brand share — brands hold most of the demand

Market size

Okay$112K

$112K/yr · 82K searches

Growth

Okay+0.2%

90-day search growth — must beat 0% to launch

Conversion

Bad0.2%

search→purchase rate — share of searches ending in a sale

Avg price

Bad$805.64

avg listing price — sweet spot $15–$100

Price range

Bad$161.45–$2150.12

cheapest to priciest tracked listing — scored on the share inside $15–$100

Competition

Clicks spread well past the top 5 (19% combined) — an open shelf where new products get seen.

Brands

35 flat

Sellers

105

Top-5 brand share

62%

Open market

34%

  • DEE ZEE21%
  • VEVOR18%
  • RDS MFG INC11%
  • Better Built6%
  • Wolive6%
  • LAPPPLSP4%

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%2%$2K4%$4K6%$7K8%$9K1101001K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)7 products missing review or click data not plotted

All 105 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +0.2% search growth over the last 90 days.
5K3KSpike '24Spike '26SepDecMarJunAugNovMarMay

Peak months: Oct · busiest ÷ quietest = 1.6×

Reviews

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall18%

“Excellent product”

Advertised Vs Actual Product10%

“works as advertised”

Fuel Efficiency9%

“Great fuel pump”

Leak-Proof7%

“Doesn't leak and serves my purpose”

Value For Money7%

“Best bang for your buck”

Assembly/Installation6%

“Simple and easy to assemble”

Ease Of Use5%

“Easy to use”

Size-Overall4%

“Perfect fit”

Strength4%

“Tank pretty well built”

Durability3%

“The plastic is durable”

What buyers complain about

Leak-Proof16%

“Leaks gasoline”

Quality-Overall12%

“Very disappointed with the quality control”

Mounting6%

“the mounting bracket is also bent upon arrival”

Fuel Efficiency6%

“The fuel gauge would not work”

Value For Money6%

“A bit expensive”

Advertised Vs Actual Product5%

“False advertising”

Size-Overall4%

“And the dimensions are wayyy off”

Instructions/User Manual/Troubleshooting4%

“Nothing in the owners manual about this”

Noise Level3%

“super loud and annoying”

Maintenance And Repair2%

“I had to repair it”

Top return reasons

Size-Overall17%
Leak-Proof14%
Defective Material/Parts13%
Compatibility-Overall8%
Advertised Vs Actual Product5%
Fuel Efficiency4%
Assembly/Installation4%
Mounting3%
Value For Money3%
Width2%