Brake Hose Clamp Question.

A picture would help?
Fit the size that matches the outer diameter, think more guide than clamp.

 

I'd agree with @Eldon, just enough to hold the hose in place. Any tighter might cause them to snag, and looser may cause wear.

Either way, better than a cable tie!

 

I have, and more importantly felt, incorrectly mounted braided brake hoses!
On the little (11 year old) lads Beta 80 we were doing some training. The rear brake hose around the rear shocker mount had a poor clip. It had worn through the braiding and the braiding turns into needles
He was doing a log step incorrectly so gets off and let's me show him. Demo performed and me shouting "more back brake" he did which promptly bust the rear hose exactly where the clip is.
That lesson £50 thanks, as that's what it cost me

 

I would avoid Jubilee type clips as they distort on tightening. I would go for fuel pipe clips as they tighten with consistent pressure all round the pipe.

 

Sprinter I was thinking more like a P clip design so that a suitably positioned bolt could retain the position.
There are plastic and metal variants,

https://www.ebay.co.uk/itm/EPDM-Rub...p-Clamp/322547600814?var=&hash=item4b1955cdae

 

Sorry are you securing the pipe to the reservoir?
If so yes you are correct, I'm over thinking it and was meaning locating the hose path.