That’s fantastic, thanks so much for your help.
I checked the site shown and unfortunately it’s out of stock. So I’ve asked if they’ve an equivalent or when they may have them again. No answer yet but they’ve possibly knocked off for the weekend.
I’ll post a reply if/when I get one.
While looking for alternative thermistors, I can across this:
Not a lot of details but may save some soldering, although I expect the plug will need changing.
It does seem weird that there can be electrical connections inside a petrol tank.
that’s handy and only a few euros. Better than 160 odd!
At that price it saves all that fiddling about.
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Hi Nick
If you bought the Griso from Firefox Racing, then it’s my old bike. I have loads of original bits and a paddock stand
Regards
Ian
Hi Ian, thanks but probably a different bike. Mine was from Broadfield Motors in Oswaldthwistle.
It would be nice if the previous owner was a member, they may even still have the second key!
Maybe worth asking on the Ghetto?
Yes could be worth a try, cheers.
Well I’m in Wilpshire. Saw that at Broadfield with low miles. Get in touch if you want
Ian
Hi again Ian. Yes the mileage is very low. The dealer said he sold the bike to someone in the Lake District, who subsequently traded it in with him against another bike but I don’t know much else.
Do you still think it may have been yours?
Nick
No - not mine. I traded for a Norton in October. Mine had 24000 miles on. Was immaculate tho
Ian
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Looked for the original part number and link shared and they had run out of stock as per Guzzitano post. So I bought 5 similar looking on e-bay that will need soldering and then I saw your link which seem to require no soldering, so I have bought 3 of these. I buy more than necessary because i have been known to screw up the install. When I get a chance, some weeks hence, I will report back on what worked.
Hey that’s brilliant! I’ve ordered too but will wait to see how you actually do it as I’ve never removed a tank with quick-release or fuel pump. 
Fuel pump is quite straightforward when you get to it.
Quick release can be a b$st*rd and the tight fit of the tank inside the frame means you need a set of “bits-of-wood” to prop it high enough that you can undo the electrical connection, fish out the tank breather and fuel cap drain and then address the “quick” release.
For the release I found that a set of snipe nose pliers could wedge either side of the connector and help it work off as you push the collar.
Thanks for the tips. I was wondering how the quick connector actually works and how to get it apart in the confined space.
Hi again, my fuel sensor thermistor arrived today, so I’ll have a go at getting it fitted tomorrow.
Have you had a chance to start on yours yet?
Not yet. I need to wait a few weeks to begin the work although both kinds of thermistors have now reached me.
I’m also thinking I might wait until after the Easter holidays, just in case I find I need the metal fuel filter and new hose. It would be annoying to strip the tank and be stuck without being able to get the parts for a week or so.
Sometimes the simplest ideas are the best.
I decided to have a look through the fuel filler cap to see if I have a metal or plastic filter. After removing the cap assembly I used a small led to light inside the tank, and to my surprise, could clearly see a metal filter!
It was also easy to see the thermistor that needs replacing. So at least I’ve slightly more of a clue as to what I’m changing.
It’s nice when things work out!
Seem to remember that to remove the quick release you should switch on the ignition and allow the electric fuel pump to prime - then the pipe comes off easily - or it did when my fuel pipe blew off mid ride on my Griso!!
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That’s a good tip, thanks Ian.
Guess the ‘quick release’ lived up to its name!