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⛽ Unlock your engine’s hidden potential—because your car deserves the best!
STP’s Complete Fuel System Cleaner is a 400ml concentrated liquid designed to clean and condition your vehicle’s entire fuel delivery system. Trusted for over 10 years, it removes deposits that cause rough idling and misfires, restoring engine power and improving fuel efficiency. Easy to use by adding directly to a full tank, it supports long-term engine health and consistently helps vehicles pass emissions tests.















| ASIN | B00BPUYPB4 |
| Best Sellers Rank | 164 in Automotive ( See Top 100 in Automotive ) 10 in Fuel Systems |
| Brand | STP |
| Customer Reviews | 4.6 4.6 out of 5 stars (768) |
| Date First Available | 6 Feb. 2013 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Item Weight | 400 g |
| Item model number | ST50400EN |
| Manufacturer | STP |
| Manufacturer part number | ST50400EN |
| Model | ST50400EN |
| Product Dimensions | 35.35 x 16.73 x 7.13 cm; 400 g |
| Special Features | Concentrated |
C**T
Great product, does exactly as it says!
I've used STP products for a long time, especially the Complete Fuel System Cleaner, which I've been using for over 10 years now. I use it on my wife's car, a couple of weeks before the MOT, to ensure the engine is running smoothly and emissions are low. Its never failed an MOT on emissions ever, in the 10 years I have been using it. Very simple to use-just add it to a full tank of petrol (there is a diesel version-so make sure you buy the correct one) via the petrol tank. Easiest way is once you have taken the lid off and removed the foil cover, is to place a funnel into the petrol slot, which keeps the metal flap (which opens when you push fuel nozzle in and springs close when nozzle is removed) open, or carefully keep bottle upright until you are ready to pour in, then quickly push the narrow top of the bottle into the petrol flap, pushing the flap down as you go, this ensures all the cleaner enters the tank. If you pour slowly, you will have to wait for small amounts of the liquid to go into the tank, via the closed flap, which takes an age to do. Don't fill up the tank with petrol again, until you get onto your 'red' warning or 'low fuel' warning light/indicator comes on, this is to ensure you dont dilute the cleaner with extra petrol and give it enough time to work its way through the engine. You should notice after a few drives (once fuel has had a chance to be cleaned) that you get a bit of 'extra power' when you put the accelerator down. This does depend on how clogged your injectors were in the first place.
M**.
Works
Not used my car much at all during the pandemic and when starting to use it again I had rough idle, rough ride, problems starting the car and the odd misfire. I suspected dirty injector’s so put a bottle of fuel line cleaner in and also the bottle of injector cleaner and filled my fuel tank with good fuel. After a quarter of a tank, all problems where solved. Car runs smoothly, I’ve got more power and it starts everytime. I’ve filled my tank a few times since using this and the car is still working without any issues. I’ve bought some more to use again in 6 months and will continue to use for the lifetime of the car to keep it running nice. I’ll only use premium fuel from now on as well, no more rubbish from the supermarket.
P**T
Preventative measure to reduce build-up of deposits or 'snake oil'?
Updated review. In summary it helped low-end performance but did not improve fuel economy for same *driving style*. Do these cleaners work? This is an emotive subject but unfortunately like most people I am not trained in stripping down and rebuilding the engine in my car! So let's look at this idea about deposits another way - burning hydrocarbons makes deposits, so would you not get your home gas boiler cleaned and serviced to keep it working efficiently? I have a 2009 Kia Rio 1.4L petrol on 60k miles, the engine is a simple DOHC 16v unit with a cast iron block. I chose this product because the datasheet indicated that it is x5 more 'concentrated' than the equivalent Redex, so this was essentially the same cost versus 'cleaning power'. During the past two years I have occasionally used Redex and I am certain it has improved the engine's response and the fuel consumption, but exactly how much I don't know. The only issue I have had with this product is with dosage, the bottle label contradicts the products US website, so I used 50% bottle in 9 gallon (imp) tank. After one tankful I would say it has helped low-end performance (up to 3k rpm) but did not improve fuel economy for same *driving style*, I think the economy gain is cancelled because you inadvertently continue to use more throttle for the same rate and so use more fuel, so maybe I'll try to accelerate with less throttle and see if I get an improvement. I think next time I will try either Techron or Seafoam. At the end of the day I see this as a one-off preventative measure on a car that I put £150pcm worth of petrol into, it may be that my 10-mile commute and occasional 'Italian tune-up' are ideal in reducing the build-up of deposits.
O**N
Nice
Nice product
E**O
Very good
Very good
O**N
Cleans the fuel tank
It dissolves build up deposits in the tank and helps keep the car running more efficiently. Gives me peace of mind knowing I'm helping the car to run better for longer
H**O
...did it work?
So I’ll start by saying that I really don’t know anything about cars. Like almost nothing. So this review is aimed at people that share that similar knowledge (seriously like if I had to scale it; 3 out of 100 in car mechanics knowledge). My car was misfiring every day. Cylinder 4. Apparently, BMW said I needed a new fuel injector. At around £750+ all in, I decided I’d just get a new car (this one was at 155000 miles and 9 years old after all). However, after a bit of googling, I found that a common issue was that the fuel injector’s lines can get clogged up and cause the symptoms my car was dealing with. So I thought I’d try and give it one last push with the BMW before ditching it. Researched the best options and this one came out as one of the best for the money. So I gave it a go. It was super easy to pour in, as the neck is really long and slots right into where you put your petrol in. Couldn’t be simpler. I left it overnight and then went to work. When I started it up, my car continued to misfire just as before (it only did it when I hadn’t driven it for about 8 hours. Once it had been driving a while, I could stop and start to my hearts content). I didn’t notice any difference whatsoever. Other than the fact the fuel gauge had gone up slightly (hadn’t considered that it would basically be adding more fuel, sort of, so bonus!). It wasn’t until the drive home (having done about 15-20 miles total since adding it) that I noticed all of a sudden that the car had become a little smoother to drive. I noticed the acceleration also seemed a lot better. It only stayed like this for a few days though, before getting worse. It continued misfiring on every morning start up and I got fed up with it, so I just sold it and moved on. So, did it work? I guess it did improve the performance slightly for a few days. Maybe it would have done better if my car wasn’t already falling apart, though. Ultimately, for the money, I’d say try it. You’ll sort of get its value in petrol (when topping up your tank) and if you’re just looking to improve the overall performance and health of your car; it probably does that.
H**L
It seems to work!
I run an elderly V8 Mercedes which I do not pamper and have always filled with cheap petrol from the supermarket. After reading a magazine review I bought a bottle of STP Fuel System Cleaner and added it with a full tank fill. The effect has been remarkable. Of course, it may just be that my car prefers colder weather, or something; but to me it seems to be running more sweetly, and with less need of the right foot, than ever in my many years of ownership. I shall definitely add the STP cleaner again, as suggested on the bottle, after a few more thousand miles!
L**Z
Orriginal
Cumple con su función original
M**L
Use it after every service
To keep your fuel system clean and engine running smooth, I strongly recommend this especially for GDI engines to remove carbon deposits on pistons and fuel injectors.
V**E
Non si dovrebbe dire ma nel mio caso: Miracoloso
La mia vecchia Punto seconda serie aveva cominciato a dare il segnale di problema al motore (spia gialla accesa nel cruscotto) senza dare apparentemente altri difetti. ho letto che poteva essere un problema alla sonda lambda e che cambiarla costava un tantinello caro. Ho acquistato questo detergente e aggiunto mezza bottiglia ad un Pieno di benzina. Ora sono passati 2 mesi e la spia gialla on si è più accesa ma, non solo: la punto ha ripreso a fare 19,2 km con un litro di benzina (prima 17,5) e quindi alla fine il rodotto mi è venuto gratis.
M**M
Not like photo
Looks like a copy, not original and not like photo
P**O
Buon prodotto
Buon prodotto, comprato perché in base alla dicitura equivale allo stesso prodotto in vendita sul sito italiano, dove per 200 ml si spende più o meno la stessa cifra. Questo da 400 ml, provato in 2 pieni consecutivi. Ho notato miglioramenti in accelerazione prima e seconda marcia, la macchina non strappa più. Miglioramenti anche nell'erogazione ad alte marce. Completamente soddisfatto, a questa cifra lo ricomprerò sicuramente (pagato circa 13 euro).
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2 weeks ago
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