I've come to the conclusion that these are different parts for the pd100 and pd130

The problem that I have is that since fitting Vrs clocks/speedo, the fuel gauge is completely wrong.

But weirdly, it works backwards, the more fuel I put in, the closer to empty the needle shows, and the less fuel, the more the needle shows.

Is there a way of swapping the electrical contacts on the fuel pump/sender that will switch this around?

I know that you can adjust in VCDS the amount of fuel shown, but you can only make adjustments of a maximum of 2L, besides, the main problem is that the gauge is backwards.

I switched the polaritys of the fuel sender cables and it made no difference unfortunately.

I did this on the fuel pump/sender plug.

There are 4 cables, 2 larger diameter cables on the outside of the plug and 2 smaller diameter cables in the middle of the plug.

I assumed that the thinner cables were for the fuel sender and the larger were for the pump.

Anybody got any recommendations?

The fuel gauge is reading perfectly backwards.

So full when empty and empty when full.

Wish I could help more, I've done very little with these clocks and never messed with them since its part of the immobiliser.

I would have thought swapping the wires over would have helped it....

Maybe fit the pump upside down

Wish I could help more, I've done very little with these clocks and never messed with them since its part of the immobiliser.

I would have thought swapping the wires over would have helped it....

Maybe fit the pump upside down

Fitting the pump upside down would definitely work just a shame it wouldn't fit.

I think I'm just going to have to acquire the pump from a Vrs and hope that it reads differently.

I had really hoped that switching the cables would work, but the gauge just read the exact same, which I thought was odd.

I've deleted the immo on my car so can fit any clocks without an issue. It can be done in the ecu flash/map.

Does this mean when you brim it the low level warning beep goes off?  

 

The only thing I can add is I am still using my PD100 pump, but obviously re-wired the entire car so the pump is plugged in to the vRS loom.  There must be something which makes it read right in the wiring as mine has been fine ever since the conversion.

Does this mean when you brim it the low level warning beep goes off?

The only thing I can add is I am still using my PD100 pump, but obviously re-wired the entire car so the pump is plugged in to the vRS loom. There must be something which makes it read right in the wiring as mine has been fine ever since the conversion.

Yes exactly.

That's strange. I can't think what would be inline.

The only thing I can think of is that they have made changes over the years, like they did with lots of other bits on the Fabia.

What year was your car mate and what year was the donor car?

Mine is 2001 and the donor (Vrs clocks) was 2004

So there is potentially a fair few changes that have taken place.

Perhaps a 2004 pump will work with the 2004 clocks

Maybe - My car is also a 2001 (Y) and the donor was an 04 plate.

Maybe - My car is also a 2001 (Y) and the donor was an 04 plate.

Well that makes my theory a lot less likely

Yep!

:(

Sounds daft not being in to electrics in any form but I would have thought if you found the one (two?) wires the sender uses, you can install something to reverse the polarity of whatever - so 1= 0, 0=1 and all the range inbetween?  

The only help I can offer is to tell you that the fuel gauge is digitally controlled by the instrument ECU, this means that the ECU reads the resistance from the sender, then converts it into a voltage which operates the gauge. You can manually edit the adaptation value to change what the gauge shows, there is a documented service calibration procedure involving putting exactly 6 litres of fuel into a bone-dry tank then modifying the adaptation value so that the needle sits bang on the start of the red zone.

 

Reversing the polarity on a resistor does nothing at all, it still reads the same R value, so no surprises there then!

The only help I can offer is to tell you that the fuel gauge is digitally controlled by the instrument ECU, this means that the ECU reads the resistance from the sender, then converts it into a voltage which operates the gauge. You can manually edit the adaptation value to change what the gauge shows, there is a documented service calibration procedure involving putting exactly 6 litres of fuel into a bone-dry tank then modifying the adaptation value so that the needle sits bang on the start of the red zone.

Reversing the polarity on a resistor does nothing at all, it still reads the same R value, so no surprises there then!

Thanks for the info

Yeah, I'm well aware of the procedure, it will only let you adjust the fuel by 2 litres either way. And that's the maximum.

You can move it at 0.2L increments either up or down with a maximum of 2.

If it's controlled by the instrument, and Jason had had success then changing the clocks to one that is compatible should work.

I'm just confused because Jason's clocks worked with it pd100 fuel pump.

It would have been far easier in the beginning for me to just buy a written off Vrs or just a very cheap one, and swap literally everything, engine etc. doh!

What internal wiring loom are you using?  Mine is PD130 wiring right back to the tail lights.  Not one bit of wiring from my pd100 still exists.

 

Well, tell a lie, the four doors are actually still wired up as pd100.  

Mine does this, after fitting 3 differant pumps, ive learnt to live with empty= full lol ...

 

I also tried switching wires, following earth to see if was faulty, checking wire and components behind dash ...

 

So your saying that unless the pump is directly from a VRS it will give this reverse reading?  Mine came from the scrap yard one off a polo, another of a fabia 100pd

Mine does this, after fitting 3 differant pumps, ive learnt to live with empty= full lol ...

I also tried switching wires, following earth to see if was faulty, checking wire and components behind dash ...

So your saying that unless the pump is directly from a VRS it will give this reverse reading? Mine came from the scrap yard one off a polo, another of a fabia 100pd

That's mad! Yours even does it from another pd100 Fabia!

What kind of conclusion can we come to then?

Pump must match clocks ... But then Jason's worked. So then it must be something inline as he's changed the wiring.

I'm still all pd100 everything mate even engine, just Vrs gearbox. So waiting for the bottom end to suffer as it's supposedly weaker

What this tells you is that the fuel sender is wired differently, if you think of a variable resistor you have connections at either end of the track and a connection to the wiper, this means that the wrong end of the track is connected so the gauge reads in reverse, simply move the connection to the other end of the track to fix the problem.

That's mad! Yours even does it from another pd100 Fabia!

What kind of conclusion can we come to then?

Pump must match clocks ... But then Jason's worked. So then it must be something inline as he's changed the wiring.

I'm still all pd100 everything mate even engine, just Vrs gearbox. So waiting for the bottom end to suffer as it's supposedly weaker

 

Well mine IS a vRS really - Given everything came across so I would have been upset had it not worked.  It must tell you the pumps - pd100 or pd130 give the same signals for the car to interpret.  I guess just my wiring is vRS oem so worked with the clocks fine.

Some interesting photos in this thread from a Russian forum:

http://forum.skoda-club.ru/viewtopic.php?t=12512&start=15

 

Someone's taken a fuel pump to bits in a big way. Scroll down past the first big block of photos, then some text, then there's a pair of photos of the 'PCB' for want of a better term, that the resistances are generated from by the float arm moving. One pic with captions 2000-2004 and 6Q0919673 seems to have the mirror-image outer connection to the one labelled 2005-2008 and 6Q0919673D.

 

Haven't tried to translate it, but that might be relevant, it seems to me.

Some interesting photos in this thread from a Russian forum:

http://forum.skoda-club.ru/viewtopic.php?t=12512&start=15

 

Someone's taken a fuel pump to bits in a big way. Scroll down past the first big block of photos, then some text, then there's a pair of photos of the 'PCB' for want of a better term, that the resistances are generated from by the float arm moving. One pic with captions 2000-2004 and 6Q0919673 seems to have the mirror-image outer connection to the one labelled 2005-2008 and 6Q0919673D.

 

Haven't tried to translate it, but that might be relevant, it seems to me.

 

Very interesting indeed. It seems to translate as saying that the sender printed resistor thing is different due to different instrument clusters.

Cheers for that Lee.

Glad i came across this... been doing my head in for a while, and kinda puts my mind at ease that if i source a vrs pump it should be fine

 

I will be trying this soon!!

 

Took a punt on this http://www.ebay.co.uk/itm/131549910287 

 

Problem with new ones is that they all fit the vrs, but fitting and working 100% is different, so not sure on paying £150 for a oem that would give the reverse gauge bs again?

Glad i came across this... been doing my head in for a while, and kinda puts my mind at ease that if i source a vrs pump it should be fine

 

I will be trying this soon!!

 

Took a punt on this http://www.ebay.co.uk/itm/131549910287 

 

Problem with new ones is that they all fit the vrs, but fitting and working 100% is different, so not sure on paying £150 for a oem that would give the reverse gauge bs again?

 

Think you can buy the gauge sender separately from the pump though?

hmm i dont know how you can guarantee its for the VRS, all these parts say suitable for the vrs... but what is actually solely for the vrs ... no idea:P

hmm i dont know how you can guarantee its for the VRS, all these parts say suitable for the vrs... but what is actually solely for the vrs ... no idea:P

 

Yeah, I know what you mean. It's a bit of a minefield.