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Fuel line length - how to locate the last connection/flare?

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Saville

Well-Known Member
Joined
Apr 28, 2014
Messages
521
Location
Boston Ma
Ok so I'm a newbie to the rigid fuel line business. So I'm sure everyone knows the answer to this except me:

I'm connecting a fuel selector to an existing line that runs to the engine. The line will have a 90 degree bend under the selector then runs forward and has to precisely meet the existing line.

I've flared one end and made the 90 degree bend under the selector, so now the tricky part (to me) is to mark, cut and flare the other end so that it meets the existing male flare fitting with no stress - neither pushing or pulling. At this point the tubing is overly long.

I can mark where the tip of the male fitting is on the new tube. But that's not where I should cut it.

I could take about 3" or so of some tubing, measure it's length precisely, then flare one end and measure it again. This will tell me how much longer the cut has to be to accomodate the flare. But there's more to it than that, yes?

Any hints as to how to accurately cut the other end so that it meets the fitting exactly would be appreciated.

Thanks
 
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