Your pump looks like a 40 psi job ? The clear hose your using will probably struggle and be more like the issue than the clamps . Tightening clamps will probably just cut into hose, plus on a hot day the clear tube will swell with 40 psi. Look at John Guest van plumbing fittings .............. push in connections .............. no clamps :Y:
https://www.rvpartsexpress.com.au/plumbing-bathroom/john-guest-plumbing-equipment.html
https://www.rvpartsexpress.com.au/plumbing-bathroom/john-guest-plumbing-equipment.html