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It's very likely WVO is part of it. It's that, and the fact that I don't drive it much at all these days so the same fuel can be sat in the tank for months.
I think you can get diesel bug in normal diesel after being stood too. Just less likely.
It's probably a combination of the two. It's making me consider if I should do something different.
For what it's worth, this is the sender I removed from this van 5 years ago, when I was using SVO but not WVO and that looks similar:

I've ordered "Wynn's Fuel Biocide Against Algae Formation", maybe that'll help
Well it's out. And with minimal hassle too - no rusty bolts or breakages. Helps that I've had this tank out 5 years ago though

Safe to say I've probably found my problem
I'm informed this is "diesel bug" - bacteria in the fuel from being stood about. Not great

Run through the dishwasher and all clean again
Next challenge is getting the tank swapped over

Driving my van up the motorway, I suddenly felt like something was wrong. And turns out it was - after 5 minutes I suddenly couldn't maintain 50mph. And then it couldn't do 30mph up hill. Uhoh.
Id idled rough, and even after changing my fuel filter still ran like crap. I eventually managed to get home, starting the engine about 20 times
Yesterday I confirmed the problem - putting the fuel line in a separate bottle of clean oil it ran fine. Connecting it back to the fuel tank, there was obvious negative pressure in the fuel line. The sender must be clogged.

I've always had a weird problem where my engine would cut out with about 20L left in the tank (I know this, because I can also get about 20L less than normal in it on a full fill). I've previously attempted to resolve this with a replacement fuel sender and float, but still it was the same.
I know the fuel tank cradle had been replaced in a previous life. I bet they used a jack on the tank and bent the bottom of it. So I decided if I'm dropping the fuel tank to clean the sender, I may as well get a new tank to solve my not-empty problem.
Get to the the scrapyard. Think hmm what else could I harvest

- Fuel tank and pipes
- Power steering reservoir (mine leaks slightly)
- Door seals (my back doors let rain in)
- Door catches (my doors sometimes jump open)
- Speedo and dash to resolve my clocks problem
- Door runners because mine are looking a bit rusty
Went for a fuel tank, came back with half the van
Been a while since I've been harvesting, had fun haha
That's a pretty good result for a van of this vintage
Wait, you have the petrol model?!
Ah in my case the odometer and trip meter still both work perfectly, so I'm guessing my issue isn't the sensor
I somewhat agree that it willl be a good investment, but depending on the rust situation it might end up with more headaches if there's stuck/rusted/etc bolts.
If it can done without it might also be a good option
Let us know how it goes either way!
What's the age and engine in it?
Can I call myself a faithful driver, or am I more of a naive fool at this point 
Yea My synergie had a rev meter. I tried swapping out the binnacle to see if it worked on mine but no dice
I'll look into this
Probably, but it's an easy fix. Just don't sever your brake line like I did 
Wait you can get a revs signal from it? How are you getting that?
Oh, OBD. That's me out. Dammit
Oh nice, which one did you get running? I miss the online ServiceBox before they paywalled it
Cheers
Are you my van twin?? Even with the side windows, although I'm jealous of how big your side windows are
I've also noticed the forum being quiet these days, but I'm always happy to see new posts appearing on here 
Unless you're attached to the stock stereo I'd just replace it with a modern one

I got this one https://www.amazon.co.uk/dp/B0CNKF3PFF
Does the job, got it sat between the steering wheel and the dashboard. Wired it in so that it came on with the ignition
I did this with springs (not shocks) on my Mk1, I assume it's the same. Mine came out of a Synergie and it made it such a nicer ride.
I assume the same applies to the C8/807, but that's only assumption
Sorry to hear you got caught by the CAZ. That same one causes me hassle sometimes, especially for that tiny stretch in Shipley
Sadly I doubt any other classification is going to get you through. None of these are classified as Car Derived Van which I gather is allowed. That's more for the Partner/Berlingo
The only one that's allowed as far as I know is Motor Caravan, but they've tightened up the rules and it's now nigh on impossible to get that for our small vans.
Take a look at https://www.catcar.info/peugeot/?lang=en
Click Expert near the bottom under Commercial vehicles
You'll then see in grey a number of body types like CAB FLOOR - LONG TYPE 8
One of these will represent your model. If you go through to 2.0 HDi and then Body work you can see if the setup matches your one
1200-1500 quid for welding? jeez, that's more than the van is worth so I'll guess it's part of the family
to consider spending that.
That's cheap compared to what mine cost me a couple of years ago
I too have never heard of any galvanised steel on these vans. I'd love if it were galvanised, maybe I wouldn't be facing my rust issues
Both rear corners under the bumper are quite far gone, although not an MOT failure yet (marginal). The garage i am using have also agreed to weld up some weak spots on the rear axle. .... will the rot come back around the repaired areas, and is there a permanent solution?
This is exactly what I had welded reconstructed and a year later I had zero rust items come up on the MOT, which was a very pleasant surprise.
So my experience is that it's worth getting it done if like RegW says it's worth it to you
Yea I keep getting that actually, I need to look into it
Can you post a picture here of the engine?
I realised at Y reg it's unlikely to be a 1.9TD. It'll be the DW8 1.9D, right?
1.9TD is a rare beast. Where is it located?
I believe the transponder ,atching is done in the key and the fuel pump. I don't think it happens in the barrel itself, other than picking up the signal