Additional Heater for Sharan

Hello!
The auxiliary heater in my Sharan has not been working for about 2 years. The problem was the fuel pump. The contacts were simply damaged. The "friendly" dealer is asking 156€ for a new one. Are there any alternatives? I can find fuel pumps on eBay for as little as 35€. Aren't they all the same? The main differences are mainly in the electrical connections, but this would be easy to fix. What should I pay attention to when buying? Are the auxiliary heater and stand heater pumps the same?

Speculation mode:
Since the auxiliary heater can be upgraded to replace the existing heater, the fuel pump should be identical (only the control panel and the water pump are being added).

Just look for the manufacturer of your auxiliary pump (Eberspächer/Webasto, although I suspect it's the latter) and buy a common pump from that manufacturer. Then it will be 95% accurate.

/End of speculation

As far as I know, a D5WZ (possibly also a D3WZ, as indicated on the type plate) auxiliary heater should be installed in the Sharan. This is for use as a stand-alone heater, while a D5WS is used as a standard heater.
The 5 stands for 5 kW, so the amount of diesel pumped is the same, therefore it should not matter.

It also doesn't matter whether the pump is for a diesel or gasoline heating system, because it is controlled by the heating system's control unit as needed.

The sticker on the pump is partially peeling off. A part of the number, which starts with 25 and ends with 45, is still legible. Also, plus number 5198, and below 3.1kW.

Is the heater then still from Eberspächer (as in the first Sharans), or has VW, like with the T4 to T5, switched from Eberspächer to Webasto?


Can you disassemble the old dosing pump far enough so that you can reconnect the contact to/with the coil again?
If so, I would do it for you and then pour it into silicone.

When testing the pump, be careful: as far as I know, this (along with the light bulb) is supplied with 8V and not 12V by the control unit!

I don't know what kind of auxiliary heating system it is. I haven't removed it, and I can't see any visual differences. I've disassembled the pump myself, and I'll try to put it back together. However, I'm not sure if it will work. It was the first dosing pump I've ever disassembled. Things will get better soon.

Simply put, the Sharan before the facelift (i.e., before 2000) has the D3W-Z and the D5W-Z after the facelift. There is no control loop for the amount of fuel. The pre-heater simply expects a certain amount per stroke. If too much comes, it will smoke, and if too little comes, there will be less heating power. That's why the D3W and D5W also need different dosing pumps. However, this is specified in the respective auctions, for which models and heating outputs the pumps are suitable. I got my pump for 30€, with the reliable, waterproof connector instead of the stupid flat connector.

Greetings,
Johannes

So, I managed to somewhat repair and connect the pump. Unfortunately, it no longer works. However, something in the heating unit has moved. The fan is running. I have now purchased a used pump on eBay. We will see if the heating system then starts up.

Since the fan has already started, the control unit for the auxiliary fan is likely not locked. It's best to turn off the heater's breaker, otherwise it will shut down due to a lack of fuel supply.

If the car is driven mostly on short trips and the auxiliary heater is emitting a lot of smoke, I would advise you to also consider replacing the glow plug and the flame arrestor.
The light bulb costs around €40, so it's relatively expensive. Therefore, before replacing it, test it with 8V!

Until the ordered pump arrives, my Sharan will be out of service. Then I will proceed. In any case, I plan to replace the temperature sensor with a switch. Currently, I simply bridged it with a piece of wire for testing purposes. If anyone has a tip for how I can get the line into the vehicle interior, I would be very grateful. Has anyone already installed something like that?
Greetings

Yes, I used a switch, and I routed the cable through a rubber sleeve towards the inside.
So dass sowohl eine Winter- (über den Sensor) als auch eine Sommer- (aus) Einstellung aktiviert werden kann.

The cables run through the left fender, so you can also tap into them there.

Maybe you'll find this interesting: http://www.sgaf.de/viewtopic.php?t=24511, and http://www.sgaf.de/viewtopic.php?t=24784, and http://johanneshuebner.com/ge/sharan/sharan-sh.shtml

Greetings,
Johannes

The pump has finally arrived. Due to weather conditions, I haven't been able to install it yet. It looks slightly different from my old one, and has different electrical connections. I need to adapt these. Does anyone know if I can connect the + and - terminals there? Normally, for a coil, it shouldn't matter. Tomorrow I will know, and then I will write it here.
Greetings

the connections are the same on the coil, as long as it clicks

It is complete!
The pump is in, the switch is installed, the heating is working! But... well, it's smoking terribly. Did I get the wrong pump? I have no idea how to identify the correct one at the auction house, since no seller specifies the performance. It is also possible that the heating system, which has been out of service for 3 years, needs to be "blown out" first.
Greetings

Great that she's running,
There are already various types of pump adjustments that can be made, even (illegally) adjusting the stroke. On one side of the pump is a brass pipe fitting, presumably with a locking nut. Tightening the nut and rotating the fitting by half a turn results in much less stroke and flow rate. Compare these with the previous ones.

But first, let it sit for a half hour.