---
title: "Fuel Injector Cleaner — £98K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/automotive/fuel-injector-cleaner"
last_updated: "2026-08-09T09:54:11.069Z"
locale: en
meta:
description: "Niche score 34/100 · £98K/yr market · 80K searches/yr · £11.95 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 34/100 · £98K/yr market · 80K searches/yr · £11.95 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Fuel Injector Cleaner — £98K/yr Amazon UK Niche (2026) - Flapen"
---
# **fuel injector cleaner**
**Skip it**
A concentrated shelf (top 5 take 91% of clicks) — this niche doesn't clear our bar today.
Market size 24Growth 19Conversion 88Competition 7Returns 97Price range 37Avg price 50Brand share 8Review moat 23Quality gap 16
**Returns**
**Incredible****0.6%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****10.2%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Good****£11.95**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****£5.11–£20.85**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Bad****£98K**
£98K/yr · 80K searches
**Review moat**
**Bad****6,896.38**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-11.1%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****91%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, fuel injector cleaner is a £98K/yr Amazon United Kingdom market (80K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 34/100.
Data updated Jul 18, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fuel injector cleaner market data**
- **Units sold / yr**
- **8K–10K**
- avg 750–1,000/product
- **Revenue / yr**
- **£96K–£120K**
- units × avg price
- **Conversion rate**
- **10.2%**
- **Avg BSR**
- **#113**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **87 months**
- **Avg seller age**
- **195 days**
## **Competition & brand share**
The top 5 products capture 91% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **▼falling
**Sellers**
**44**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**91%**
Top 20: 100%
**Open market**
**0%**
- Liqui Moly56% - WYNNS19% - STP15% - TRIAX4% - Wynn's3% - Carlube3%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -11.1% search growth over the last 90 days.
4K3KSpike '24Spike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/uk/automotive/fuel-injector-cleaner/trend)
## **Top fuel injector cleaner search terms**
- **engine flush**37K/yr-10.9%11.1% conv. - **engine flush diesel**12K/yr-10.0%11.2% conv. - **liqui moly engine flush**11K/yr-7.4%9.0% conv. - **engine flush petrol**5K/yr-13.6%12.0% conv. - **engine oil flush**6K/yr-22.9%11.0% conv. - **diesel engine flush**3K/yr+22.7%11.5% conv. - **oil flush**3K/yr-9.6%12.8% conv. - **liquid moly engine flush**3K/yr-34.0%12.7% conv. [**All search terms **](https://flapen.com/research/uk/automotive/fuel-injector-cleaner/search-terms)
## **Top fuel injector cleaner 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%15%£15K30%£29K45%£44K60%£59K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 8 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**LIQUI MOLY Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2427**Liqui Moly**£8.44**4.7★14,367 rev](https://www.amazon.co.uk/dp/B001CZSG94) [2**Wynns Engine Oil Flush Cleans Inside Engine & Removes Harmful Deposits 425ml**WYNNS**£5.21**4.7★1,173 rev](https://www.amazon.co.uk/dp/B000Y8WF06) [3**STP GST62450EN06 Engine Flush for Petrol & Diesel Engines 450 ml**STP**£5.11**4.6★2,047 rev](https://www.amazon.co.uk/dp/B0095KKXB2) [4**LIQUI MOLY Engine Flush 300ml Oil Additive SKU: 2678**Liqui Moly**£7.05**4.7★2,313 rev](https://www.amazon.co.uk/dp/B01C4FZTA4) [5**TRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon - Non-Solvent - Safe for Engine Seals & Injectors - Professional Shop Grade 473 ml / 16 US Oz**TRIAX**£16.83**4.9★227 rev](https://www.amazon.co.uk/dp/B0FM9PZ2WT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**TRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon - Non-Solvent - Safe for Engine Seals & Injectors - Professional Shop Grade 473 ml / 16 US Oz**TRIAX**£16.83**227 rev6mo ago](https://www.amazon.co.uk/dp/B0FM9PZ2WT) [**Wynns Commercial Vehicle Oil System Flush - Deep Engine Cleaner - Removes Sludge & Deposits - Turbo Safe - For All Engine Types - Synthetic & Mineral Oil Compatible - 1L**Wynn's**£15.34**9 rev1y ago](https://www.amazon.co.uk/dp/B0F8R1Y416) [**LIQUI MOLY Engine Flush 300ml Oil Additive SKU: 2678**Liqui Moly**£7.05**2,313 rev10y ago](https://www.amazon.co.uk/dp/B01C4FZTA4) [**Carlube Flushing Oil SAE 20 4.55 L**Carlube**£20.85**99 rev13y ago](https://www.amazon.co.uk/dp/B00CFMQ9JM) [**STP GST62450EN06 Engine Flush for Petrol & Diesel Engines 450 ml**STP**£5.11**2,047 rev13y ago](https://www.amazon.co.uk/dp/B0095KKXB2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**TRIAX Pro Engine Flush Oil-Based Deep Clean Motor Oil Flush Removes Sludge & Carbon - Non-Solvent - Safe for Engine Seals & Injectors - Professional Shop Grade 473 ml / 16 US Oz**TRIAX**£16.83**4.9★**▲ 145%**](https://www.amazon.co.uk/dp/B0FM9PZ2WT) [**Wynns Commercial Vehicle Oil System Flush - Deep Engine Cleaner - Removes Sludge & Deposits - Turbo Safe - For All Engine Types - Synthetic & Mineral Oil Compatible - 1L**Wynn's**£15.34**4.8★**▲ 48%**](https://www.amazon.co.uk/dp/B0F8R1Y416) [**Wynns Engine Oil Flush Cleans Inside Engine & Removes Harmful Deposits 425ml**WYNNS**£5.21**4.7★**▲ 28%**](https://www.amazon.co.uk/dp/B000Y8WF06) [**STP GST62450EN06 Engine Flush for Petrol & Diesel Engines 450 ml**STP**£5.11**4.6★**▲ 15%**](https://www.amazon.co.uk/dp/B0095KKXB2) [**LIQUI MOLY Engine Flush 300ml Oil Additive SKU: 2678**Liqui Moly**£7.05**4.7★**— 9%**](https://www.amazon.co.uk/dp/B01C4FZTA4)
**~~View all trending →~~**
## **What buyers say about fuel injector cleaner**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**30%
*“The product is great as have used before”*
**Efficiency**12%
*“Effective”*
**Advertised Vs Actual Product**10%
*“Does the job as expected”*
**Lubrication**9%
*“Amazing stuff flushed my oil out no problem”*
**Value For Money**7%
*“Great value engine flush”*
**Noise Level**6%
*“Does make the engine smoother and quieter, and its easy to use”*
**Fuel Efficiency**4%
*“Great value engine flush”*
**Ease Of Cleaning**4%
*“Clean engine”*
**Ease Of Use**3%
*“Easy to use”*
**Soft Feel**3%
*“it definitely feels smoother”*
### **What buyers complain about **
**Leak-Proof**25%
*“have heard stories about leaks caused afterwards”*
**Value For Money**21%
*“a little pricey”*
**Strength**8%
*“not strong enough for a heavily varnished engine”*
**Color**6%
*“The old oil was pretty black even though it was within service limits”*
### **Top return reasons **
**Compatibility-Overall**50%
**Leak-Proof**17%
**Wet Cleaning**6%
**Value For Money**4%
**Functionality-Overall**3%
**Advertised Vs Actual Product**3%
**Eco Friendliness**3%
**Quality-Overall**3%
**Fuel Efficiency**1%
**Motor Issues**1%
## **Common questions**
- **Is fuel injector cleaner profitable to sell on Amazon United Kingdom?**
- The niche generates £98K/yr across 8 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -11.1%. Flapen's verdict: Skip it (34/100).
- **How competitive is the fuel injector cleaner niche?**
- 6 brands and 44 sellers compete. The top 5 products take 91% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in fuel injector cleaner?**
- Top complaints mined from reviews: Leak-Proof, Value For Money, Strength. The return rate is 0.6%.
- **When does demand for fuel injector cleaner peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the fuel injector cleaner niche?**
- Listings span £5.11–£20.85; the average listing price is £11.95 (sweet spot $15–$100). The average incumbent carries 6,896 reviews — the moat a new listing must climb.
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