[Fot] TR6 race car re-build - Fuel line questions

[Scott Janzen]

I agree with Jason on the location of the regulator. My Holly regulator is mounted on the firewall bulkhead, with a tap for the fuel pressure gauge on the dash right off the regulator.
My GT6 runs triple webers, 6 AN line from the rear. The pump is a facet 40–105, puts out plenty of fuel flow. It’s rated at one to four psi. My regulator is set for a three psi discharge. Webers don’t like to see any more than that.. Fuel filter in the rear upstream of the pump. It’s a fram canister filter.
As a sidenote, I think having the fuel pressure gauge visible is handy so you have a confirmation that the fuel pump is working fine. That said, those facets seem to run forever, and I just replaced my first one after 15 years.
One thing I think you’ll find with the webers, which are great, is that they have big float bowls. When you shut off the car, shut off the fuel pump first, and let it run a couple minutes to drain down the fuel bowls. That way you don’t have hot fuel from the exhaust manifold heat when you try to start the car again.
Seems to work much better! I’m usually killing the fuel pump as I roll off the track into the pits.

Sent from my iPhone

> On Jun 12, 2025, at 12:27 AM, Jason Ostrowski via Fot <fot at autox.team.net> wrote:
> 
> Lots of questions there. 
> I’m not a TR6 guy but I’d like the fuel pressure regulator to be in the engine compartment. For Tuning and regulating purposes; close to where you are at when you’re watching the motor and gauges.
> Jason Ostrowski
> Friendly Ghost Racing 
> 1969 Triumph GT6+ racecars
> 
> Sent from my iPhone
> 
>>> On Jun 11, 2025, at 10:17 AM, Mark Cook via Fot <fot at autox.team.net> wrote:
>>> 
>> 
>> All,
>>  
>> So, I have gutted and stripped the #55 ‘69 TR6 race car first purchased, having a proper roll cage installed and painted, and will be installing a newly built engine with triple Weber 45 DCOEs.  Will be ordering some parts while cage is installed and body painted.
>>  
>> Brings me to my questions.   What size fuel lines – 5/16” (-5) or 3/8” (-6)?  Also, thoughts on 100% steel braided PTFE, or combination of metal fuel line (front to back) with braided to connect to the fuel cell and Webers?  Fuel pump, filter and pressure regulator will be in the trunk with the fuel cell.   Return line?  The 6 previously had fuel injection and a fuel return line.  Not sure it is necessary for the Webers.
>>  
>> Thanks!
>>  
>> Mark Cook
>>  
>> During Chuck Arnold’s ownership (pre-2018)                             Prior Owner 2018-2023                                                                          Now (coffee table stage)                                                                                                                                                                                                                 
>>  
>> <image003.png>
>>   
>> <image004.jpg>
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