For 90° bends in my fuel hoses that go to the carb, I take a piece of 5/16" steel tubing and bend a 90° with a tubing bender, then work it into the fuel hose where I want a 90° bend so the line doesn't pinch/collapse on turns etc... The steel tubing lining the hose will keep it from collapsing... It can take a bit to get the tubing where you want it, but you have to work it a little at a time...
If you put some most of the way or close to where you need just hose alone for the flexibility, then end the tube lining just before that...
