In my yoof I used to buy microbore copper tubing to make hard fuel line, and relied on pushing enough hose on and using two clips to ensure a decent seal...probably not ideal, but worked none the less. Anyway, I'm about to do some more, and thought I'd put it out to TLB for opinions: First idea is to flare the end of the pipe, with a flaring tool, but instead of double flaring (so you end up with a wine glass shape), you do a single flare, so it's more like a tulip.... Second idea is to use olives from a compression fitting, 10mm in from each end....it'd mean sacrificing the nut from the fitting as you'd have to saw it off (or leave it rattling) once both ends have been done... of the two, which would provide the better sealing?
I'm fitting an eleccy pump, which fits nicely just below the top gearbox mount, so it's suspended on hose from the tank outlet to the rear tinware (LHS). I was going to run flexi all the way to the carb (centre mount), but decided it's too close to 2 & 4 manifold for comfort...I don't want a fuel joint in the engine bay apart from the carb, so I'm planning on hard line from more or less the carb inlet, down behind the inlet manifold, along the shroud, round the corner and back thru the rear tin by about 4 inches... from what I remember stock 1600 had something similar, but I'mm using 8mm fittings
I assume you will connect the hard line to a flexy line for the final connection? In that case the olive is only there to provide a nub to help prevent the pipe pulling out of the flexy? If the ID/OD s of flexy & hard are matched, it'll be the clip that provides the final seal anyway. I've just had to replace all the flexy line on the boat with line to ISO 7840-2004 to satisfy the Boat Safety Scheme examination for fire resistant hose. Some was on barbs on banjo fittings, some went to hard pipe with olives , some went onto normal hard pipe. All sealed diesel tight with the correct hose clips....
My other option is to use stainless braided hose tbh, it's the nature of the beast.....the best route is as above, but rather than stick the flexi in heat shield where it passes the manifold, I'd prefer to use hard line...it's also smaller OD so fits better
Flaring it a bit then using jubilee clip is the way i'm planning on doing mine. Not sure whether copper or kunifer is better with petrol, but i'm also not sure there's a difference Edit: NOT jubilee but correct fuel line clamp, but you get the gist
Yeah the olive or flare is just to give the hose clip something to pinch on behind it....it's low pressure anyway, but I've seen flexi fuel hose slide straight off hard line even when clamped (albeit badly)
think either is fine....copper's pretty inert...kunifer has nickel in so is supposedly less prone to corrosion....can't remember the last time I saw a copper pipe rust....
