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

Thu Jun 12 06:35:36 MDT 2025

Holley makes a pickup attachment called Hydramat that will suck fuel from
anywhere it touches making the one pickup style fuel cells even better than
adding a second pickup. We use it in the ChampCar. Before we added one we
found that we would have fuel pickup issues with a couple of gallons of
fuel in the cell. The strategy we use on our 15 gallon tank is to start
full, run 2 hours, add 10 gallons at each stop and before the Hydramat we
had drivers coming in early  for a "miss", throwing off the whole plan. The
only drawback is that you can completely run out of fuel. It'll miss and
then stop pretty quickly!

www.holley.com/products/fuel_systems/hydramat/

On Thu, Jun 12, 2025 at 2:12 AM rocky spitfire4.com via Fot <
fot at autox.team.net> wrote:

> For years I just had the stock metal line in my full-race Spitfire, which
> ran under the floorboard. Eventually it got pinched. The system I installed
> was an ATL cell in the trunk, with a duckfoot pickup in each back corner,
> two Holley red fuel pumps leading to a T-fitting – all in the trunk – then
> a single line through the passenger compartment just under the door (as far
> from me as possible) to a regulator under the hood mounted on the firewall,
> then to the carbs. Regulator has a gauge installed where I can see it. I
> don’t really refer to it while driving (although I can), primarily I use it
> when setting fuel pressure to the carbs. For the Spitfire 2½ pounds of fuel
> pressure was wholly sufficient (the Holleys would deliver 7). For the TR6
> maybe something else. Oh, and ALL lines braided since they were all
> vulnerable.
>
>
>
> I ordered my fuel cell direct from ATL and specified the two pickups.
> Roundy-round guys usually only have one, in the right-rear corner, because
> they only turn left. We go both ways. I also ordered the cell with a
> dipstick to know the fuel level. And then [image: 😆] discovered that
> while the cell had the place to put the dipstick in, the foam inside did
> not! I had to take the top off, pull the foam out, figure out where the
> hole needed to be and cut the hole in the foam. Then the first time I
> filled the cell, I filled it one gallon at a time and marked the dipstick.
> It’s worked great ever since. I also learned not to fill the cell full to
> the top because it would splash out of the overflow and corners got all
> excited that I was spilling gas. Filling it a gallon short got me through
> all races. For autocrossing (with the two pickups) 3 gallons worked fine.
>
>
>
> --Rocky Entriken
>
>
>
> *From:* Fot <fot-bounces at autox.team.net> *On Behalf Of *Jason Ostrowski
> via Fot
> *Sent:* Wednesday, June 11, 2025 11:08 PM
> *To:* Mark Cook <mecook at mindspring.com>
> *Cc:* Friends of Triumph Group Email <fot at autox.team.net>
> *Subject:* Re: [Fot] TR6 race car re-build - Fuel line questions
>
>
>
> 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>
>
>
>
> <image005.jpg>
>
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>
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