I have been guilty of tightening too much. Always paranoid of engine dumping its load from either fuel or oil hoses
Me too; I’ve used worm drive fuel line clips for high pressure applications and fuel injection for many years.
Incidentally, this is what can happen when a hose clip is overtightened: http://thelatebay.com/index.php?thr...clips-on-fuel-pipes-especially-plastic.39912/ Note what was done when the leak was found – the clip was tightened further causing more distortion and the leak worsened. The worm drive clip was blamed but exactly the same would happen if a nut and bolt clip were overtightened.
I use Jubilee clips holding my oil lines on and the pressure there is up to 85 PSI with cold oil or around 45 PSI with hot oil. OK I double clip but it does not leak. Fuel injection in busses is only 45PSI or so and even when I let my FI pump run into a closed valve it only hit 200PSI and the Jubilee clips I was using on the mock-up still held. The main thing is whatever clip you use exerts even pressure around the hose. A correct sized Jubilee clip has the same inside curvature as the clamp type when it is tightened so will grip the same. The main difference is it is harder to overtighten a clamp type clip or fit it to wrong sized hose (although I must admit to finding a longer screw sometimes for low pressure stuff like fuel hoses.) , while smaller jubilee clips can be really overtightened. The other thing I note in that plastic crushing with a Jubilee clip is the mention that some fuel hoses go soft like calamari when they have been exposed to fuel for a few days - they soften up a lot and then pop off if you do not get them correctly tightened.
