Jon1964
Regular.
Thanks Buffer, yes I regassed this morning, and it looks like its stabilised at 7 psi tonight.I think what's happened here is your priming sugar has done it's thing but you've lost the pressure it produced cos you had to take the cap off to fix the float. You now need to re-establish that pressure. Assuming you DON'T have a leak you can either use gas or reprime, something I know @terrym has done when he used pressure barrels.
Will have a look tomorrow, and if need be swap out the caps and re pressurise.
Cheers Jon