VW Tandem Pump Rebuild for VAG PD Engines

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VW Tandem Pump Rebuild for VAG PD Engines - oil leak fixed DIY

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Күн бұрын

In this video I rebuild the Tandem pump off a 2.5 pd VW t5 Transporter that needs repair. It had an oil leak and I show you how to take this unit apart and replace the gaskets to cure an oil leak it has. Not a full on how to video but an in depth view of how these units come apart and can easily be fixed. This will be very much the same whether its a 1.9 or a 2.5 pd powered vehicle.
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#vw #volkswagen #vag #audi #seat #skoda #tandempump #rebuild #repair #transporter #t5

Пікірлер: 57

@welileboysie1587 11 ай бұрын

thanks for the video, helped me out, my pd130 was dripped fuel, i was doing 12l/100km, after changed the houses o-rings and gasket, i am getting 4.5l/100km. i also changed the vacuum pumps side o-rings because i had the full gasket & o-ring set

@NottherealRobWarner Жыл бұрын

Great video will be using this when I do mine tomorrow thanks for being so informative with the instruction

@ianwilcoxson1579 2 ай бұрын

Very useful video, did you put silicone on the block side of the pump as well ?

@RJW_Customs 2 ай бұрын

Hi yes I did

@ianwilcoxson1579 2 ай бұрын

Thanks for the reply, just done mine same as you (so didn’t touch the fuel pump) can I ask how stiff should it be to turn the shaft, I need a pair of pliers to turn it, I was worried so I took it apart again but it’s all fine, however as soon as I tighten up the four bolts on the vacuum section it gets quite stiff?

@ChrisandPolly 2 ай бұрын

Hi there, How would you diagnose the difference between a tandem pump failure and injector seal failure? Before I dive into the injectors I was hoping to rule out less invasive potential causes to my hard starting in the morning in the mornings. No diesel in oil. Cheers, Chris

@RJW_Customs 2 ай бұрын

Unfortunately lately there's no easy way to tell which is giving you poor start, does it smoke on startup? That would indicate fuel leaking past the seals into the bores. If there is no obvious sign, I would start with the tandem pump as its the easier and cheaper of the 2 repairs, if that doesn't fix it then it's going to be the injector seals

@ChrisandPolly 2 ай бұрын

@@RJW_Customs There’s no smoke on normal start up, but on first start of day there’s a tiny bit of black smoke from what I assume is unburnt diesel. Clears in seconds then no smoke at all. I’ve changed fuel filter so assume that and the low pressure side is ok. Lifter pump in tank makes a gurgle sound when it primes.

@RJW_Customs 2 ай бұрын

Generally all pds have a little black puff of smoke on startup. This could be a sign of worn seals as it's got excessive diesel sat in the bores from leaking past the seals. But I would still start with tandem pump without solid proof on the injector seals. The lift pump is it just a little noise or a gargle like it's filling a cavity that's got air in it?

@ChrisandPolly 2 ай бұрын

Yes. It sounds like a squirty gurgle. Like when a water pump first primes. Different sounding to other lifter pumps on other vehicles we’ve had.

@tonymoore4947 2 ай бұрын

Could you offer diesel leaking into the oil. Just had major work done. Same problem returned

@RJW_Customs 2 ай бұрын

Yes you could get diesel leaking into the oil via the little oil seal in the diesel pump aide which I didn't change in this video

@Jsweeken 4 ай бұрын

Is it supposed to be diesel behind the first cover? Or do i have a bigger problem than bad gasket

@RJW_Customs 4 ай бұрын

It's made up of 2 separate pumps essentially so yeah first one is a diesel pump, the second one (closest to the engine) is a vacuum pump

@Jsweeken 4 ай бұрын

@@RJW_Customs yes thanks, I mean if there is diesel flowing behind the first plate or if it should only be inside the part with the springs? ( that you didn’t open in the video) I assume the axle seals that is included in the kit is also changed by open this “inner pump”

@RJW_Customs 4 ай бұрын

That whole part will be full of diesel

@Jsweeken 4 ай бұрын

Thanks I will take a look when I take it apart, can’t find any photos online in that area

@algerienoranais6908 Жыл бұрын

Thanks man

@RJW_Customs 6 ай бұрын

Your welcome

@tmarinelic Жыл бұрын

Please, can you adjust the fuel check valve backpressure by rotating the screw? Thank you

@RJW_Customs Жыл бұрын

Unfortunately I've never played with it so wouldn't like to say

@sretlawgerg 9 ай бұрын

Handy video thanks! I’ve just got a diesel caddy that has supposedly got high oil pressure and diesel mixing with the oil I’ve narrowed it down to the tandem pump (hopefully) Would the full seal kit fix this or is it a case of a replacement?

@RJW_Customs 9 ай бұрын

Potentially but if its got high oil pressure it could be high enough to push past the seals, so I would check the oil pressure first, if it is high address that problem first and then look at the tandem pump. If it's not high then a full seal kit should sort it but you will have to replace the little seal that I left alone on this one

@sretlawgerg 9 ай бұрын

Thanks for the reply. Ah ok! My assumption was the leaky seal would be forcing high pressure fuel into the oil making the pressure go up? What else could be causing the high oil pressure? And what would be a symptom of high pressure so I can know when it doesn’t have high pressure 😅 Thanks

@RJW_Customs 9 ай бұрын

Its possible but is the oil in the diesel or diesel in the engine oil? Best thing you can do is check the oil pressure with an oil pressure gauge kit

@givethanks6714 11 ай бұрын

Thanks for the video. A person told me, I have to leak test a used or rebuild pump before use, how is that done? My pump seems to only leak (at least leaks through the orange seal). I don't know if I should just do what you do without the extra sealing and hope for the best, or buy new or used.

@RJW_Customs 11 ай бұрын

I've never leak tested one so i can't advise on this. If you've got fuel leaking into your oil then it's going to need the extra seals doing. If it's just leaking oil or diesel externally then you will be able to do the same as I did

@givethanks6714 11 ай бұрын

@@RJW_Customs Thanks. Yeah the main culprit is not going through inspection cause of oil leak, I know this and the oil filling tube seal/(s) is bad, so both needs attention. But some say it leaks again after changing gasket, so they end up buying new. Is what you used on top a gasket maker?

@RJW_Customs 11 ай бұрын

I used rtv which is labeled up as a gasket maker yes

@givethanks6714 11 ай бұрын

@@RJW_Customs Cool. What did you do after assembling on the car. Did you turn on off ignition many times, or did you just start it? Wont there be some air and hard to start?

@dangerross8406 8 ай бұрын

I can smell diesel of my tantrum pump and when I turn the heating on in the car? Can it be that the seals need changeing as I have my mk4 for 15 years now 😮

@beepee123 5 ай бұрын

Any issues starting the van after due to disconnecting the fuel lines?

@RJW_Customs 5 ай бұрын

You will need to make sure you run the lift pump in the tank several times to fill all the gallery up with fuel and push any air out. Either activate it with a scan tool. Or cycle the key on and off multiple times letting it prime the pump

@beepee123 5 ай бұрын

@RJW_Customs sound, thanks mate, did you put gasket sealant on every face or just the o ring?

@evanbowen395 8 ай бұрын

Is there a non return valve in the tandem pump im loosing fuel pressure and hard to start but once started runs fine

@RJW_Customs 8 ай бұрын

I dont think there is from memory. I would guess that maybe your injector seals are letting the fuel in the gallery in the head leak by and so it has to rebuild pressure up each time you go to start

@evanbowen395 8 ай бұрын

I have replaced all the seals and still having this issue, the oil level isn't rising and I've done 500 miles since replacing the seals

@RJW_Customs 8 ай бұрын

OK, without seeing the vehicle and knowing all the history I'm purely guessing. But back to your original question I'm pretty sure there's not a one way valve in the pump

@evanbowen395 8 ай бұрын

Okay thanks I try adding a nrv I the lines tomorrow and see how I get on

@Juppie902 Жыл бұрын

can i put a dab of silicone on fuel pump gasket too ? im leaking some diesel from the pump area

@robbiewingate Жыл бұрын

Where it bolts to the vacuum pump? If only using a small smear so that none gets pushed into the pump when bolted up you should be ok

@Juppie902 Жыл бұрын

@@robbiewingate i cant tell if its from the vacuum pump or diesel pump because they're both one unit, i can just see lots of grit and diesel smell, now i know my valve cover isn't 100% sealing but it wouldn't make a diesel smell.. or is my oil diluted with diesel.. maybe inside the pump ? got a gasket set with new bolts ready.

@RJW_Customs 6 ай бұрын

Potentially either of those but if diesel is getting into your oil the tandem pump needs rebuilding anyway