Fuel pipe and fittings

[jdc]

I'll try to answer, but there are others more expert than I, and I'm not sure I'm completely right.

Thanks JDC.
Not sure how the 2 photos relate though. The 90 degree elbow, olive and tube are clearly common but the top photo shows the hose swaged (?) to the copper tube and the lower one some kind of fitting with a nut.

The swaged hoses and hose tails are different in that the black ones are those made up by the boat builder, whereas the yellow one was made up by ASAP to a standard length which I have in my spares kit. The yellow one does not have a swage but a terminal which seems to have been screwed and possibly glued in place - not what I expected when I ordered it, but it came with a test certificate saying it had been tested to 3000 psi, so I guess it's pretty robust. The colour of the hoses isn't relevant as the ID is the same and they are made to the same ISO standard.

Is the swaged hose just straight onto tube? or is the tube flared in any way? can the swage be made with just a hand tool?

The tube into the hose isn't flared but has corrugations on it. I don't know what tool was used for the swage, it might be a hand tool but I've only seen industrial ones which are hydraulic. The yellow hose doesn't have a swage at all but is more like a high pressure gas or air hose; the corrugations are sharp and the tail seems to have been screwed into the hose (which, I'm guessing, is why it has a hexagonal bit). Possibly it's glued as well but I'm not 100% sure of this.

How do you get the elbow to be a tight seal and 'point' at the right angle?

Using thread sealant from Loctite, which is one reason that they aren't undone that often.

Is there not an elbow with a hose tail so you can just fit the elbow direct to the hose thus saving one connection element?

I've not seen them - EDIT: just found one

But looks a bu££er to swage and still has the 'torque' relief problem I alluded to.

 

[pcatterall]

JDC many thanks for your time answering all those questions. I only hope that others with similar questions are sharing the advice or can find it when they may need to.
Taking a sort of middle road on the elbow question I think I may be inclined to 'go for' the elbow with the tail and use loktite to secure at the right angle then( regarding torque) fit the pipe with a good quality clamp. I have found that I can assemble the hose onto the tail but slightly loose then tighten the fitting into the filter allowing the hose to turn on the tail, finally tighten the clamp to the tail.
Many thanks again.