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“What about flexible lines?  Do I make them and then firesleeve, or does
the firesleeve have to be on before the fitting goes on?”

The firesleeve goes on after you make the line. Firesleeve (typically a
fiberglass woven fabric) has a hi-temp silicone coating. The ends of the
firesleeve should be dipped in liquid silicone but you can get by with just
a little hi-temp (normally red) silicone applied to the cut end. This is to
prevent the fabric from acting like a wick and absorbing oil etc. After the
hose is made, the firesleeve (cut to length and the ends sealed) is slid
over the hose and then secured in place at each end with stainless steel
bands (like ty-wraps). You can also substitute a few wraps of safety wire.

The other option is to get your hoses made by a hose shop. They'll come
professionaly finished and pressure tested. You specify the size, length,
and fittings. This is what I do when I install a new engine.

"Do I have to worry about fireproofing the metal bulkhead fittings for the
fuel lines where it penetrates the firewall?  (I wouldn't think so.)"

I can’t say I’ve ever seen firesleeve on bulkhead fittings, HOWEVER
firesleeve does serve a second and important purpose ......... it acts to
insulate the fuel in the line from the high heat of the engine compartment
which helps to eliminate vaporization in the fuel lines.

Ted Stanley
A&P-IA
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Please send your photos and drawings to marvkaye@olsusa.com.
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