Economics
If you only have a few hoses, the savings are not that great...
As an example - a 24 inch, 3/8 fuel line hose with firesleeve. Straight end fittings.
Approx. prices from A/C Spruce
$14 - Hose - 24 inches
$16 - Firesleeve - 24 inches
$20 - Two fittings
$3 -- 2 end clamps
Totals $53 - and does not include $109 (...
...) for the fancy, certified end dip stuff. But most homebuilders either omit this step, or just smear red RTV here...
Also does not include a few bucks to the local shop for pressure testing, several hours saved (unless you have already done many), and the usual expense for band-aids, etc.....
Quote from PHT
24 inch certified Stratoflex 111 hose with firesleeve - $63.40
or a possible upgrade...
24 inch certified Teflon hose Stratoflex 124J hose with integral firesleeve - $84.49
We don't use many hoses in our RVs, so the cost increase is not that much, and the hoses come pretested.
I personally like the much smaller diameter integral firesleeve Teflon hoses, since they are easier to route in a crowded engine compartment.
However you go, these hoses need to be high reliability...
Small diameter hoses ( -3 size) for brakes, and engine sensors I think can be handled by the premade Teflon ones for Pegasus racing, and don't seem to need firesleeve.
gil in Tucson - just went through this with some Tiger oil hoses.
UPDATE
Vans prices...
Approx. prices from Vans (but are Aeroquip) - components only
$21 - Hose - 24 inches
$14 - Firesleeve - 24 inches
$41 - Two fittings
N/A -- 2 end clamps
Total - $76
At this price, the PHT integral Teflon hose is a really good deal...