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Rob's REBVAIR Project
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Date:  7-1-2015
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Fuel line to carb

The first image shows my first iteration of running the fuel line from the gascolator to the carb (fuel line is actually an-6 stainless steel braided hose, but it is covered in firesleeve in these photos). When I first considered the placement of the gascolator and the fuel line firewall pass-through (and the box that encloses), I wanted them on the left side of the aircraft because the MA-3SPA carb had its intake on the left, and I wanted the shortest possible 'run' of fuel line between the two.

Well, it turns out that there is such a thing as 'too short' a run. Image 1 shows the two blue fittings...I essentially need to get from one to the other, but they are so close that the braided hose we use for these installations is not flexible enough to make this connection directly. So Image one represents the first path the braided hose could take to come out of the gascolator (exit through the box on th elower left of the image).

The problem with this routing was that it circled around one of the exhaust pipes, effectively negating the whole intent of the design. After thinking about it further, I came up with the iteration in Image 2 and 3. A 90 degree fitting coming out of the box redirects the hose straight forward, and it then does a 270 degree turn to a straight-in approach to the carb.

This routing is short but has enough flexibility to absorb the engine start vibration (in my estimation...this isn't specified anywhere). More importantly, it keeps the hose away from the exhaust pipe (Image 3) save for one area where I fabricated a heat shield to minimize exposure of the fuel line to the incredibly hot (1400 degrees) surface. I see now also, that I could soften the turn with a slightly longer section of hose, so I will need to re-do this one last time.
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First configuration

First configuration

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final orientation

final orientation

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exhaust heat shield

exhaust heat shield

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