MK4 VW Golf TDi Diesel Purge How-To

How to do a Liqui Moly Diesel Purge on a MK4 Golf with almost 250k miles on the clock. This is a 130PD engine code ASZ. What you will need is aprox. 2 meters of clear tubing with a inner diameter of 8mm, 2 x 8mm pipe connectors, an in-line filter with 8mm outer diameter connectors and a can of diesel purge. You'll also need a empty bottle, scissors and pliers.
All of these can be purchased on ebay fairly cheap. This whole setup cost me around £16.
UPDATE 03/09/17: This car in question is still running with 264K+ miles on the clock!
UPDATE 17/02/18: New video showing differences in engine configuration on an Audi A4 has been uploaded!
• How to do Diesel Purge...

[@moormanator]

This is excellent. Love how you used the pre-filter for the old Mercedes 123 diesel on the return line. I always hated to see the crap going back into the bottle when I did my '84 300d.

[@kermitefrog64]

It does work I did a diesel purge on my 1981 Mercedes Benz 240d. If you live in California the only way to get the LiquiMolly is on EBay or Amazon. I have not found this in any of the automotive stores. Pelican Parts and Mercedes Source also carry this chemical.

[@bholagupta714]

kermitefrog64 .

[@bholagupta714]

kermitefrog64

[@geriatricginger]

Darth Vader operating the camera? :)

[@muckman5509]

Geriatric Ginger my god I was just about to make that exact comment

[@peterbense5650]

For anyone else wondering, non PD engines don't have a pump in the fuel tank, hence the "loopback" tubing seems to be an unnecessary step for those cars (1999-2003 MKV TDIs here in the US). I know because I just did this procedure on my car today.

[@ytjythteregr]

+Peter Bense Didn't know that about the non-PD, thank's for the info (Y)

[@johnrichardson544]

Hate to possibly correct, but you say "1999-2003 MKV TDIs", don't you mean MKIV? And, I know someone WITH an 03, and their's IS a PD, and DOES have a fuel lift pump.

[@Andy2x4]

Hi there, thanks for this video. You seem really good at responding to the comments even all these years later, so I just wondered if you may know the answer as to why my bottle of diesel purge is just getting filled up with diesel? Is it likely that the fuel pump fuse needs removing? Many thanks

[@arebrec]

"Luke, I am your father." ;)

[@MikeHanby]

Thanks for the video Lozzy, very helpful!

[@dogbite5509]

Sounds good for 250k. I recommend Mannol PD engine oil for this engine.

[@Bigj-bf4mn]

I’ve only used rotella t4 in my bew 370,000 kms runs mint I think the vw oil suggestion is a scam

[@alenmartinovic8378]

Hi! Can i try to put diesel purge in new filter, and start car or only this way.

[@pearlprints5019]

Good job mate, but thats oil in the fuel. U could of save urself time by ordering a fuel pum and tandom pump service kit which is cheaper than the purge. Rebuild it and fuel the car up with 10L diesel and 5L petrol, change the fuel filtre. Drive it hard until the fuels gobbled up. Sorted.. u shud do this with every timing belt change. 60k. Keeps the engine health in check

[@Alban77777]

The direction of little filter is on the bottle i think nice video thnx

[@ianjamesbrady6841]

I have a 2017 Mercedes’ w205 c220d how do I diesel purge it please.The fuel filter only has 2pipes on it cheers and thank you

[@Andy2x4]

Hi did you manage to sort it? I have the same car and wondered what you did? Many thanks

[@psmh4]

I have 475 k on 2006 tdi I guess I should try this

[@TheAriiiiii]

Sorry couldn't hear the engine over his breathing.

[@ARKAN489]

Hello thank you for this video I have a problem Hyundai Tucson diesel exhaust coming out of very smelly like odor sulfur almost .. engine quiet good smoke does not just smell Please reply

[@desertfox4921]

اسمك وعلامتك صايرين ماركة مشهورة ، اشوفهم بكل مكان

[@sabiya2]

I only have 2 lines going into my fuel filter, supply line and return line, can I just take off those 2 pipes of the fuel filter and put them in the purge bottle? The supply line goes into the fuel filter and the return line goes to the fuel pump,

[@digitalscribbler68]

That's a nifty trick.

[@johnrichardson544]

You mention at the beginning of your vid, something about avoiding getting air into the fuel system? When your replacing filters, damaged rubber pipes etc, you ARE introducing air into the system, and cannot avoid that. So you have to prime the system instead, unless it's self priming.

[@ytjythteregr]

The engine has a tandem pump that pulls the fuel up from the filter so a bit of air in the lines from the filter to the engine is ok, it would only be an issue if you had air in the lines from the tank to the filter as sometimes the lift pump in the tank fails and you dont know because when there is no air in the lines the tandem pump can bring the fuel from tank with no issues but when the lines have air in them from the tank and the lift pump is broke, the tandem pump hasn't got enough power to bring the fuel all the way from the tank and through the filter. LJ.

[@johnrichardson544]

Lawrie Jordan Not sure I fully get that? Do you know why the air issue causes problems for the tandem pump? Surely it's just effectively sucking on the line, the same as I would suck on a rubber hose for example? Also, do you know if I turned the ignition key (without starting the engine) to activate the fuel lift pump, does that pump have enough power to be able to force the diesel through the tandem and out the return line that goes into the fuel filter? I'm guessing it doesn't?

[@chrispfeif5552]

nice video Samwell Tarly. thanks

[@Lozzy07]

Lol

[@noobsound]

I am gonna do this on my Vw T4 2.5tdi... 600 000km with original injectors.

[@Corsa15DT]

Diesel at engine at 250k miles, put some diesel purge and drive on. Petrol engine at 250k, what petrol engine?

[@matteightytwo]

I had a mk4 Golf, 1.8t, that retired on 267k, in the final year of that cars life it did 5 track days, on one track day it did 260 miles on the track. Original engine, head never removed, original turbo

[@shadowwolfXD97]

That inline filter won't show you any results, the fuel that travels down the return line hasn't passed through the injectors it's simply traveled into the injector rail and back out again, anything you see in that filter is just out of the lines and the rail

[@zoron4561]

Yep but u forget that purge fuel work on bro,and clean injectors ,pistons,valves and turbo !!!

[@honestguy7764]

Way too complicated. I just took out the fuel filter, emptied from the bottom nut (first a little water to the sewer then the fuel in a separate bottle ), then poured the purge on the filter and reconnect everything. As a little of purge is left in the bottle you pour it in the fuel bottle and then to the tank. Its nice to do it whe you change the fuel filter as part of the usual maintenance.

[@paulwilkinson8099]

Can you elaborate a bit more please

[@Accarvd]

I'm going to state the obvious... but the return line shouldn't be dripping into the bottle and creating bubbles! You can see bubbles being by the engine

[@88TitanCW]

I think he was using the bubble to knock the dirt of his injectors. Lol.

[@Dan23_7]

Which hose from the filter is the feed to the engine ? Is it the one with the plastic chunk with the pipe on the opposite side of it or is it the one that goes straight off the filter ? I’ve a 2003 beetle 100 ATD PD. Great to see a fellow Brit doing this and not a yank 😂

[@Lozzy07]

Afraid I can't remember now! It's been years since I've had the fun of working on a PD engine! I would say follow the lines to figure which is which.

[@Dan23_7]

@@Lozzy07 Cheers mate, I’ll google it first 😂 I noticed the vid is 7 years old now 😂

[@handymanplasterer4267]

I done this to my galaxy and felt the difference straight away, is there a mk7 ford transit video that someone could forward to me? I don't like trying it unless I've seen it done 👍

[@vanjavanjavanja]

Is it safe to do it on 2002 Audi A4, 2.5 TDI V6 engine...? I read down in the coments that's not good for some type of engines...

[@csabakamaras2820]

Thank's for video

[@chetankupte7098]

Can't we directly add in to fuel tank

[@cvnapps51]

Seems a lot of Diesels benefit from this treatment. How often should a car be treated?

[@robking5096]

Can’t you just put it directly into the fuel filter?

[@pierrekoff5420]

I like a lot the way you do that job...great! My little question is to know how should I do a Liqui Moly Purge on a Kia Carens 2.0FJ2005? The 'in' and 'out' on my Bosch's pump is'nt so easy to recongnise...Thank"s to give me help.Greatings from Belgium. Kind regards.

[@anirudhaarvind1736]

Try to find a workshop/service manual for your car on the internet. That will have the necessary details you need.

[@muckman5509]

If only you knew the power of the TDI

[@kunra7477]

Fuel filter must be on the intake side of the plastic tube

[@ernetmaroc6560]

does this method work for renault dci cars with a booster pump in the tank (ex: clio4 captur)?

[@AKMCars]

about how it looks...u must do it again soon

[@Lozzy07]

Haven't got the car anymore.

[@zakrstcasniisloboduz]

Hi Lozzy. Great video. Thanks for sharing. Can you please provide with a link where I can buy tubes and in line filter. I am not sure what to look for on web. Thanks much! Cheers!

[@Lozzy07]

I got all the materials off eBay. This sizes are in the video description.

[@kiscsori]

If you have problem to buy this items.. Better if you don't touch the engine 🤔🤔🤣

[@anirudhaarvind1736]

Thanks for your video mate. I found it really informative. Though i had a question regarding the inline filter. What was the reason you chose the 8mm dia, and will any inline filter work, or does it need to be a diesel specific filter? Thanks in advance

[@Lozzy07]

Anirudha Arvind The fuel lines on the engine are 8mm so I use 8mm pipes and connectors/filter to keep it all easy to connect up

[@anirudhaarvind1736]

What about the type of inline filter? Will any old inline fuel filter do the job? or does it need to be specific to diesel fuel. Thanks a bunch for your help!

[@Lozzy07]

Anirudha Arvind It needs to be a paper type filter just like the one in the video, the mesh screen type ones will just let the dirt particles pass through. Doesn't need to be specifically for diesel fuel. I got them off eBay, just search 8mm fuel filter and you'll see them.

[@anirudhaarvind1736]

Thanks for your help mate. :D

[@AlainNoirmoutier]

I've done exactly that on my SEAT ibiza 2009 with 105000km ! Except I continue till the engine stop but itself ... and then I couldn't restart it. I knew it was because air got into it. I have been recommended to spray some toilet freshener into the tube that goes to the air filter which I did ! After a small explosion sound: The car started straightaway. The only thing is, since then, purging and all ... the car make a sound of vibration which I can feel on the pedal while passing the gear 1 and 2....after pushing the accelerator the vibration goes away. I've been told it was the flywheel .... why ? Is it because of the purge ? Do you know what went wrong ? .....Thanks for reading this !

[@Lozzy07]

+Alain Jean The purge shouldn't have done anything to cause damage to the flywheel. My own engine tends to vibrate on idle unless you touch the pedal, diesels can rattle a bit. I would not suspect the flywheel has an issue though unless it's been showing other symptoms beforehand.

[@AlainNoirmoutier]

+Lozzy07 Thanks Lozzy07, it's kind of a relief what you are saying as I have been told the same by a few other people: that it has nothing to do with the purge. However, I can't get that into my mind as these vibrations weren't present before the purge and appeared just right after it...maybe something's been missing in the process.

[@irmissslive]

You broke your fuel injectors mate!

[@irmissslive]

Electronic fuel injectors brake from this puerge shit, just connect an obd cable to your car and see for yourself

[@AlainNoirmoutier]

Thanks for your imput...what do you mean ? Are you saying that you don't recommend this purge ?

[@teddywitdacamera84]

Would the method work on a semi tractor 2007 Volvo 670 with a isx Cummings engine ?

[@baqerali63]

good video 👍

[@hish2311]

i think the beter ideal is mix 30℅ liqui moly ans the rest fuel cause the engine need power with the cleaner do not be damaged

[@thefitchesvideo]

How does one know which line supplies the fuel and which is the return? I have same engine but in Audi so it is mounted in another location.

[@IPDeliev]

you will have to trace the hoses which one goes from the fuel filter to the pump and which one returns from the engine back to the filter

[@Peter_Riis_DK]

This video suffers severely from bleedin' VVS (vertical video syndrome). Shit!

[@ahsanafzal48]

nice video and clear instructions. i have a mercedes e class cdi 2005 model. would it help with that. i am assuming you live in the uk. are you able to help. where do you live. thanks

[@Bakanelli]

Be very careful to not run that CR on air or air bubbles like this chap is doing on a pumpa düse, which doesn't hurt it nearly as much, still far from good. Air to CR is a death sentence.

[@abdallahboughaba3786]

hello thank you for video. i am wondering if it working with LIQUI MOLY super diesel additive ?? thank you very much

[@maximsimagin6978]

abdallah boughaba i

[@zahirzahar553]

very nice i liked .send more video

[@abbesdcc8216]

merci pour la vidéo ...c trés bien marché coooool .

[@peteypops]

How is it that the engine starts ok despite you breaking the flow lines and, presumably, letting some air in?

[@Lozzy07]

There is already fuel left over in the lines leading upto the tandem pump, so it has enough to start and can therefore drag enough fuel/solution through to continue to run. It does cough and splutter to begin with but runs OK after that initial response. It's the same as replacing the fuel filter during service, some air will inevitably enter the fuel lines, so long as it isn't an excessive amount, you should get away with it.

[@peteypops]

Looking forward to owning my first diesel powered vehicle, enjoyed getting some info on basics🇦🇺

[@davidbenjamin9509]

some videos suggest put the filter on the feed line which you done it in the return..? whats the best way doing it??

[@ytjythteregr]

+l_l_lAdidasl_l_l TM Either way will work just fine. I put the filter on the return line to stop them polluting the clean solution in the bottle. If you put the filter on the feed line, it will simply filter the solution before it goes to the injectors, so to be fair either way will work.

[@davidbenjamin9509]

+Lawrie Jordan okay thanks.. I ordered a pack of 5 filters. So I can put 1 on feed and 1 on return lool. But I'll think I'll just put it on return.. 1 more problem I have is locating which 1 is feed and return I got a idea which may be right but I don't know 100%..? [vwGolfmk5GTtdi2005]

[@Lozzy07]

+l_l_lAdidasl_l_l TM Without seeing your exact engine can't really help with that one. Although I think the layout is similar to the MK4 TDi such as the one in the video, so may be the same line I used. As discussed though, shouldn't be an issue with which one you filter.

[@justinwilliams8065]

dont you want to filter the fuel before it goes in the engine...

[@lyessemar6203]

i would clearly choose before , it make more sense

[@mrcneale]

@@lyessemar6203 Nope, the liquid moly is clean. Anything that comes back out of the engine is dirty, so you want to filter it before it can get back in to the bottle.

[@westmakati]

why is it that others put the inline fuel filter to the feed line instead of return line? what's the correct one? or can do either

[@Lozzy07]

westmakati You can do either I suppose, I've done mine on the return line to filter out any deposits coming back from the engine, so they don't pollute the solution that's being fed into the engine. If you do it on the feed line then it will filter it before it goes to the engine, so to be honest either way will work.

[@westmakati]

Lozzy07 you have a good point and I actually agree on what you did. i just got confused that watched other vids and they did it the other way..... thanks much for your reply and very informative vid!

[@gabrielg.martin2689]

It worked?

[@MrIndustry91]

Any noticeable difference in engine performance or mpg?

[@Lozzy07]

MrIndustry91 Yeah, engine is smoother on the throttle and less smoky on start up/full power, MPG has increased slightly by about 10% I'd say.

[@Trev9]

Shake the last drops out

[@davekana8388]

Is there a pump in the tank of a 2000 ALH Beetle?

[@Quantum-]

yes

[@davekana8388]

+Kyle Harris thanks Kyle!

[@CANERm3]

Alh engines or other vw tdi ,sdi engines with bosch vp 37 injectionpump they dont have a lift pump in the fuel tank there is only 2 wires for fuel sender for instrument cluster .

[@davekana8388]

That's what I thought, thanks!

[@bholagupta714]

Dave Kana

[@MrBuildmeup]

OMG , Darth Vader is REAL.

[@charcoal84]

what does it mean if fuel does not return circulate in the small loop on the car? is there a pump not running?

[@ytjythteregr]

+Bull Moose That could indicate the lift pump in the fuel tank is either not working or not providing enough pressure to push fuel to and past the fuel filter. This would only be a problem if the car was ran dry of fuel as the tandem pump on the engine can bring the fuel through when there is no air in the system, but if you run out of fuel, the tandem pump will not be able to pull fuel all the way from the tank so you won't get the car to start again until the lift pumps been replaced.

[@charcoal84]

+Lawrie Jordan Thanks! It appears to be working after all. I did this twice and the junk coming out from the engine was super dark. Was hoping it would improve my mileage but no luck...still not getting above 40mpg like I used to when the car was new. CV joints are completely worn--thinking that's a culprit. Cheers!

[@TheAriiiiii]

Good video though.

[@deltamane17]

That guys breathing makes me cringe

[@DAIMBRAN]

Fucking mess won’t be easier just drop moly in the tank and that’s it?

[@federicomartin14]

Golf Im yout father

[@88TitanCW]

God. I had to stop watching this. That guy that is snorting the camera is really distracting and annoying.

[@MarcYilmaz]

Wear gloves and change the filters.

[@markross1384]

Wow.... Name calling, isn't that very 90's. My comment was meant as a joke as the video is completely awkward to watch due to the recording angle. I did however state it was a good how to. Maybe if you can't take constructive criticism, you shouldn't be posting how to's.

[@ytjythteregr]

Erm I didn't add that reply...