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Author Topic: GTI low pressure fuel pump change  (Read 4991 times)

Offline mjmallia

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GTI low pressure fuel pump change
« on: November 16, 2024, 02:29:36 pm »
Well what started as a general investigation, ended up as project.

Decided to have a look into the LPFP to improve the cold starts and suspected I had a tired back flow valve that was bleeding fuel pressure. I also discovered i had an old style pump due to having an early GTI that was prone to overheating and was never changed.

I had already changed the pump controller to a new one as they too were prone to overheating and going pop.....my wife's golf did this on a journey and the car almost set on fire.

The new genuine pump was £270 + VAT so more than i wanted to spend since doing the cam chain job, a new VDO like genuine was out of stock everywhere  and far less so went for the next best thing......a genuine secondhand one.

The new part number is 1K0919051DB and got one off a 1.4TSI Scirroco 2018, so a lot newer than mine and far less miles done on it too for £31 BARGIN!

Disconnect the pump fuse. 15 amp number 27 started the car until it died, then disconnected the negative battery lead.



Removed the back seat and was amazed how dirty the top of the pump was



Removed the ring, pump and seal of which I noticed was pinched from factory. Old pump ended in AE so definitely original






New elring pump seal and also the new to me pump back in








While I was there i also changed the fuel filter

Fuse back in and started the car
« Last Edit: November 16, 2024, 02:31:40 pm by mjmallia »
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Mike

South Coast

S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #1 on: November 16, 2024, 02:34:10 pm »
Car started straight away and it felt like it did it with less effort. Yet to do a proper cold start, but happy with what has been achieved
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Mike

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S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline ZoliWorks

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Re: GTI low pressure fuel pump change
« Reply #2 on: November 16, 2024, 04:36:07 pm »
I also cant find a VDO pump anywhere but I can get Pierburg or Bosch units. Any clue if these would be ok or does it have to be OEM?

Also do update on how it cold starts next time, since I'm having some issues and the pump is the next thing on my list.






Edit: Found this one on Autodoc. I've heard mixed reviews about Autodoc. Some say it's aight, other say they are knockoff parts. Price is 110 euros.


« Last Edit: November 16, 2024, 05:05:07 pm by ZoliWorks »
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Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #3 on: November 16, 2024, 06:17:52 pm »
Autodoc is fine. Ordered a lot from them and it's def genuine stuff.

They were sold out of the VDO ones when I had looked the other day.

I was tempted by those brands but just decided to look for a newish genuine one with the latest PN. This one I got is 6 years old low miles compared to my 20 yr old one and 120k miles for £31......could not argue with that.
« Last Edit: November 16, 2024, 06:24:56 pm by mjmallia »
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Mike

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S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline TheBALDpuma

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Re: GTI low pressure fuel pump change
« Reply #4 on: November 16, 2024, 08:18:52 pm »
I will never use Autodoc again. Ordered febi parts and they just changed the order to their own brand stuff, and sent it out. And when I complained I had to jump through an absolute ton of hoops to get a refund.  Never again.

Partsinmotion are my preferred online autofactors
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Offline ZoliWorks

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Re: GTI low pressure fuel pump change
« Reply #5 on: November 16, 2024, 11:04:15 pm »
I've heard that a few times, yeah. Quick dig through the forums, they own Ridex and one other brand and they will occasionally swap out whatever you order with those parts, claiming the part you ordered isn't available, even tho their website says it is. They also dont notify you of this apparently.

Well anyway, I'm in luck. 1K0919051DB comes back as a valid part number for VDO 2803580112302 which is in stock at a friend's parts dealer for 125 euros. Now hopefully this VDO unit is a new-ish one and not leftover stuff from the early 2006 stockpiles lol

The only thing the surprises me is that all pumps claim an output pressure of 4 bar while we run them through 6.6 bar filters, maintaining an average hpfp feed of 5.5 bar and occasionally spiking to 7. At least in my case..
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Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #6 on: November 17, 2024, 09:14:54 am »
The original pumps like what I took out were 6.6 but the newer ones were 6.4 from the TSI age but are backwards compatible with the TFSI.

First proper cold start at 7 degrees C this morning and no issue at all and a slightly faster start and a smoother initial drive from cold.
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Mike

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S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline ZoliWorks

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Re: GTI low pressure fuel pump change
« Reply #7 on: November 17, 2024, 08:58:45 pm »
Do you happen to have a part number for the pump control module? I figured I'll replace that too.
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Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #8 on: November 18, 2024, 09:43:06 am »
Mine is 1K0906093H made in 2012 but the latest PN ends in J.

The J has been redesigned again and has a metal back plate for heat dissipation (some of the later H version have this from about 2016 - my H is the older all plastic version).......might upgrade again in due course..........I need to stop LOL.

I recall the really problematic controllers ending in B and D, but they all do eventually......my original was a D and the first mod I made to the car  :laugh:
« Last Edit: November 18, 2024, 10:59:10 am by mjmallia »
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Mike

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S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #9 on: November 18, 2024, 09:51:14 am »
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Mike

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Offline ZoliWorks

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Re: GTI low pressure fuel pump change
« Reply #10 on: November 19, 2024, 12:04:25 am »
Awesome, thanks chief!
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Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #11 on: November 20, 2024, 07:57:54 am »
Big test this morning as I had not driven the car for two days and it was -1C to add some icing on the cake for a proper cold start.

She started within a split second........has to be the fastest cold cold start in the seven years I have had the car, as usually get several cranks before life, or had to prime the car twice before turning the key.

Very happy, but have ordered the version J pump controller that came off the same car as the pump........I will update!
« Last Edit: November 20, 2024, 07:59:31 am by mjmallia »
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Mike

South Coast

S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #12 on: November 21, 2024, 05:20:36 pm »
Got the new to me lastest PN fuel pump controller.

I had to change the plug from my original, original D version, as the red release slider on the clip had been broken by the seller. .... no big thing really as it only cost £15.

Plug transfered and ready to go in




« Last Edit: November 22, 2024, 10:41:21 pm by mjmallia »
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Mike

South Coast

S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI

Offline ZoliWorks

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Re: GTI low pressure fuel pump change
« Reply #13 on: November 28, 2024, 12:47:03 am »
So it's been a few days, how's it holding up? how are those cold starts?
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Offline mjmallia

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Re: GTI low pressure fuel pump change
« Reply #14 on: November 28, 2024, 08:13:47 am »
All fine thanks.  Solid starts with these cold mornings
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Mike

South Coast

S3 8L ---- Golf Mk4 GT TDI ---- Lupo GTI ----  A4 B6 Sline ---- Golf Mk5 GTI
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