Reply With QuoteHave you wound multiple turns into the solid fuel line at the flex point to allow movement?
Aaron
TopicToaster
Hello All,
Do I need to put a flexible break in a new length of metal fuel line that goes from the carburettor to the fire wall to allow for it to be able to flex?
The flexible break could be formed by cutting the metal pipe and fitting a short length of rubber fuel line with two adjustable hose clamps.
Kind Regards
Lionel
Wizard
Have you wound multiple turns into the solid fuel line at the flex point to allow movement?
Aaron
TopicToaster
Hello Aaron,Originally Posted by Aaron IIA
Thank you for the reply. That is a good point!
No, I have not bent the fuel line up as yet. How many coils around would it need?
Kind Regards
Lionel
Wizard
If I were doing it, I would probably use about four turns, with about a four inch diameter. That said, flexible rubber fuel line is now easily and cheaply available. If using rubber fuel line without proper hose barbs, I would probably slightly flare the ends of the solid line to aid in retention of the flexible line.
Does your car have a carburettor of EFI system?
Are you using copper pipe or brake line for the solid fuel line?
Aaron
TopicToaster
Hello Aaron,
It is a carburettor for a HQ Holden 202 cubic inches pre-pollution motor in a Series III. The fuel line is painted/coated steel pipe.
I have used proper barbed fittings to connect the pipe to the original type of solid state cylindrical fuel pump. It has the black plastic fuel lines running from the petrol tank and then along the chassis rails to the engine bay.
Anyway, Aaron you have answered my question about needing some feature to allow for flexibility and movement between the engine and the firewall.
Kind Regards
Lionel
Wizard
Reasons for my questions. Copper is more likely to work harden and develop a fatigue crack. Steel is better. EFI fuel pumps operate at a higher pressure, so need a higher specification flexible fuel line. Seeing as you have a SU fuel pump (which incidentally is not solid state) that only develops around 1-3psi, ordinary, but rated, flexible fuel hose will be your best option.
Aaron
RoverLord
Since the early days of motoring, it has been known that some way of allowing flexible movement in the fuel line between the engine and chassis or body was needed. Traditionally, copper was used, because it was easy to work with, and a spiral of several turns was used.
Some time around WW2, synthetic rubbers resistant to petrol were developed, and these were used to make properly terminated flexible hoses to accommodate the movement, as on Series 1 and 2 Landrovers. During Series 2a production these were replaced by the use of semi-rigid nylon pipes instead of steel, and no special flexible section was needed. Initially these had proper screwed terminations, but later were simply joined with rubber hose.
I would not use coiled rigid pipe on any Landrover.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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