Help! T120 2025 Tank Off.

There seems to be a fair bit on Google on different forums. have you tried this? https://www.manuals.co.uk/triumph/bonneville-t120-2025/manual

 

I hope you find what you're looking for, it's so annoying when you can't find out what you need to!!

 

You can access the official Triumph Service Manual. It's online subscription only and costs £5.99 for a months subscription. But be aware that it will auto renew after a month if you don't cancel.

 

When fitting the auxiliary power socket to my Speed Twin 900 I only had to raise the rear of the tank and propped with a piece of timber. The harness is located on the Right Hand side of the bike (when sitting on it) and can be found behind the solenoid valve. A 5mm Allen Key is required to remove the Throttle Body cover and the same Allen Key to attache the Power Socket Bracket.
Hope this helps.

Alfie

 

The most difficult part of removing the tank is disconnecting the fuel line, especially if you don"t have the release tool.
The tank fixings are obvious, it slides forward onto two rubber bushes either side of the headstock and a bolt fastens it at the rear.
There are two electrical plugs situated around the middle section RHS for the pump and guage sender, plus a vent pipe on the LHS underneath. This is how the tanks on my Street Scramblers and my current 2024 1200 Scrambler locate. I don't believe the other bonnevilles are any different, except possible the Thruxton.

As Alfie has said above, if you can access the connector you require without removing the tank completely you will save yourself a lot of faff.

 

The fuel pipe stays connected to the tank. The connector is on the other end of the pipe and connects to the fuel rail. The breather pipes unclip from the underside of the tank by bending open the clips.

 

I am assuming things are similar to my 2025 Speed Twin 900. My pipe clips are thin flat metal straps bent into a circle that can be opened up to release the pipes (I have 2 pipes alongside each other). When the rear of the tank is raised you should be able to see the fuel line connector which can be released by sliding the safety clip sideways and pressing the 2 rubber buttons and pulling and twisting back and forth the connector off it's spigot. For £5.99 I would recommend a months subscription to access the service manual.
triumphtechnicalinformation.com

 

This is a good picture of the fuel line/fuel rail connector that will/should be on your Bonneville. It pushes down and locks onto the spigot to the left of it. The square button(s) in the centre of the connector is the locking mechanism release and the plastic forked section then slides over the buttons. The buttons have to be squeezed in together to release the latching mechanism but it will be a tight fit and can take some releasing (pulling upwards).

https://www.triumphrat.net/threads/2020-t120-fuel-line-reconnecting.998518/



I bought a tool similar to this to release the connector….

https://www.ebay.co.uk/itm/32630727...dbZ7MIBgvKoHEcSr7V+izA2Vebc=|tkp:BFBMgtrc-axm

 

Wasn't aware of that fuel connector release tool at the time or I would have bought one. So made my own which works well.

 

It’s a relatively simple tool but the job is made much more difficult without one. I did a bit of homework prior to doing a tank-off job so ordered one in advance. Your DIY device is just as good.

 

Couple of pics showing the fuel connector on my Speed Twin.

 

When you reconnect the fuel hose make sure it clicks and is fully home with the safety clip closed. It has been known for the connector to not be properly engaged and comes apart under fuel pressure when riding. Not ideal!

 

From memory mine both had a single release tab? Access isn't great for mine and would have been more accessible if the cable was longer. And both connectors are parked on locating tabs once reconnected.