10Ft should do nicely as the Filter to "T"Splitter takes about 6.5Ft 

& the remaining 3.5Ft should cover the Splitter to Rails runs ~ There is

no need to route the Feed Hose through the Old FireWall Fitting Hole so

that saves a little on length needed ~ Also, When routing the FeedHose

through the Frame CrossMember just ahead of the Eng'Bay I choose to

use the Smaller of the 2 Holes so the FuelHose gets separated from the

Heater Hoses & also Do Not ZipTie the FuelHose to Heat or Rad'Hoses ~

        I have never experienced the need to replace the Return Hose so

can't speak to Its Length but that run Doesn't require the High Priced

High Pressure Hose so any Good Quality Fuel Hose will do ~

                                                        ORR ~ DeanB

On 26 Aug , 2019, at 4:26 AM, Steven Shelton wrote:

> How many feet do you buy to replace all the lines?
> 
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> On Mon, Aug 26, 2019 at 12:26 AM OlRivrRat <OlRivrRat@comcast.net> wrote:
> 
>> On 25 Aug , 2019, at 9:15 AM, Steve Williams wrote:
>> 
>>> AND the plastic fuel lines from the fuel tank to the firewall: Shall I
>>> replace them with good quality continuous rubber fuel lines all the way
>>> to the engine compartment?
>> 
>>        IMHO > Absolutely YES ~ 1 Continuous Length of High Pressure
>> (225PSI)
>> 
>> Fuel Injection Hose is My Weapon Of Choice ~ Cuts the number of Hose Clamps
>> 
>> & Potential Leak Points to 2 (@ Filter & @ Splitter in Eng'Bay) & those
>> are then
>> 
>> Rubber, Hose Clamped to Metal Nipple rather than Rubber to Crushable
>> Plastic ~
>> 
>> Here in ABQ, Advance Auto has Gates 4219BF Barricade 5/16"/7.9mm FI Hose
>> 
>> for $3.60/Ft >>> Way Cheaper than an Engine Fire ~
>> 
>>                                                        ORR ~ DeanB
>>