I did it!
I've managed a few internet assisted fixes on cars over the last few years, but this is one of the most satisfying.
One thing which the excellent Medium article didn't cover as clearly as I'd hoped was the was connecting the wires after replacing the pump.
You do have to disconnect or cut the cable to get it through the rubber grommet. Maxi Mizer on Medium says
"
The final step is to connect the wires. I took apart the original connector and took a couple of spades from some water-proof plugs and used those on the new wires to fit them into the original connector. It’s not the best fit, but didn’t want to replace the other end of the connector"
I tried to take apart the connector, but soon realised you need a terminal release tool to free the pins from the original connector. These vary massively in size, and it was either try a cheapy Temu special (not for me) or spend a fortune on a mechanic's set from Toolstation or a specialist.
Buying the correct side of the connector got me just that, the connector without pins /spades so I ordered both sides of the connector and just used the pins from that order. You can see from the picture the little non-return flaps that you would have to push, both at the same time, to release the pins in the original one to reuse them. I tried needles, wires, all sorts, and nothing was fine or strong enough.
When you cut the cable, I recommend pulling it through the grommet as straight / vertical as you can. If it's aligned right it moves really easily, otherwise it feels like it's stuck fast and you're about to pull out the wardrobe. If you put some electrical tape around the new wires it goes through the grommet pretty easily (from in the tank, up, into the wardrobe).
The other thing I'm glad I did was tape a freezer bag around the connectors, as even with an empty tank there are drips that make their way out on the water sensor.
With it all connected back up, bit of water in the tanks, I was super chuffed to see water from the tap!
I can also recommend Ecoworks Marine Eco-friendly All Purpose Sanitiser to clean your tank and pipes (I have no affiliation, I just rate it). I'm so sceptical of so many things that have "eco" or "green" put on them when it's an advertising con. When I couldn't find anything easily in van circles, I thought boaters might have something. Scott at Ecoworks Marine recommended the All Purpose Sanitiser, and it's been great. If you get the concentrated one like I did as I love best value, make sure you check your concentrations.
Ecoworks Marine Eco-friendly All Purpose Sanitiser is an effective all food surface disinfectant and cleaner comprising of naturally derived ingredients.
www.ecoworksmarine.com
Pictures attached of my pump fixing in case it's useful in the future to anyone. Thanks again for all the help on the forum, you folks are ace!






