[rebel-builders] fuel line...
Posted: Sun Feb 19, 2012 5:07 pm
Hi Jean
If you put aluminum tubing inside the sidewall like the manual shows, I
think guys just run it through the bulkheads with rubber grommets. Don't
put any rubber tubing inside the wall though as sooner or later you will
need to replace that. The door post holes are too thick for rubber
grommets but you can always put a piece of 1/2" od, 3/8" id plastic
tubing through those to act as a grommet. Aircraft Spruce and Spaenaur
also sell hard plastic inserts that can be snapped in or glued into
bulkheads.
With EFI, my lines run up the left side inside the fuselage just below
the aileron push pull tube so no protection is needed. (My right tank
routes under the floor over to a header tank on the left sidewall).
Jim mentioned today that he took the right fuel line from the tank
rearward a couple of feet and then across the cabin roof. Joined it with
the left tank and ran it forward under the door. He got a constant
downward slope.
Lots of different ideas out there but I think it is a bad idea to run
the lines from the tank outlet forward and uphill. I'd be scared of
trapping air up there when the tanks are almost empty. Air bubbles will
restrict flow. Probably best to stick with the manual which does suggest
a general routing for the lines with a downward slope all the way to
the gascolator.
Ken
jean.poirier@oxyportneuf.com wrote:
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If you put aluminum tubing inside the sidewall like the manual shows, I
think guys just run it through the bulkheads with rubber grommets. Don't
put any rubber tubing inside the wall though as sooner or later you will
need to replace that. The door post holes are too thick for rubber
grommets but you can always put a piece of 1/2" od, 3/8" id plastic
tubing through those to act as a grommet. Aircraft Spruce and Spaenaur
also sell hard plastic inserts that can be snapped in or glued into
bulkheads.
With EFI, my lines run up the left side inside the fuselage just below
the aileron push pull tube so no protection is needed. (My right tank
routes under the floor over to a header tank on the left sidewall).
Jim mentioned today that he took the right fuel line from the tank
rearward a couple of feet and then across the cabin roof. Joined it with
the left tank and ran it forward under the door. He got a constant
downward slope.
Lots of different ideas out there but I think it is a bad idea to run
the lines from the tank outlet forward and uphill. I'd be scared of
trapping air up there when the tanks are almost empty. Air bubbles will
restrict flow. Probably best to stick with the manual which does suggest
a general routing for the lines with a downward slope all the way to
the gascolator.
Ken
jean.poirier@oxyportneuf.com wrote:
If I run fuel line under the door sill, what should I do to protect the fuel line (alum. tube) when going across the fus 2/fus 4 ???
In some archives, Bob P. talked about fuel line running on top... Someone have a picture? I am really not sure of what I should do ...
Why there is no clear instruction in the manual... isn't a important work?
a bad day..!
Jean
Rebel 747R
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