[Fot] SU HS6 problems during hard braking

Sun Jul 14 09:10:39 MDT 2019

Jason, I once had a similar problem. I swore it was flooding, but in the end it was a loose coupling of the fuel line onto the tank : at every braking zone, the line was forced forward and thus air was sucked in the line and into the fuel pump. Every time,it took a few seconds for the pump to make pressure again. Another possibility : the fuel line can be crushed somewhere i.e. by the engine when it is moving forward under braking. 
Marcel. 

Van: "fot" <fot at autox.team.net> 
Aan: "Jason Sukey" <jsukey at gmail.com> 
Cc: "fot" <fot at autox.team.net> 
Verzonden: Zondag 14 juli 2019 05:09:16 
Onderwerp: Re: [Fot] SU HS6 problems during hard braking 

We experienced this, but getting the pivots in the orientation you have them was the fix for us (in a TR-4). You can try a different top orientation though, assuming you have the float bowls with the 3 screws. The front carb is likely the problem - under braking the fuel goes to the front so the float drops. As soon as you stop braking the float bowl is overfull. 

Regards, Tony 
On 7/13/2019 8:37 PM, Jason Sukey via Fot wrote: 

The floats pivot so the swing front to back. On the rear carb the pivot pin is nearest the firewall, on the front carb the pivot pin is nearest the radiator. 

Thanks, 
Jason 

On Sat, Jul 13, 2019, 9:29 PM Greg Blake < [ mailto:gblake58tr3 at icloud.com | gblake58tr3 at icloud.com ] > wrote: 

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What is the orientation of the pivot on the floats? 

Sent from my iPhone 

On Jul 13, 2019, at 8:17 PM, Jason Sukey via Fot < [ mailto:fot at autox.team.net | fot at autox.team.net ] > wrote: 

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Phil, I'm running 2 psi. My fuel pressure gauge stays consistent during the entire run. 

Thanks, 
Jason 

On Sat, Jul 13, 2019, 9:15 PM Phil Gott < [ mailto:vfracing at aol.com | vfracing at aol.com ] > wrote: 

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Jason; 
What sort of Fuel pressure are you running? Should be 1 1/2 to 3 psi, although a Spitfire driver and I run 6 with no apparent ill effect. More than that could be causing you some of this problem. 
Phil Gott 

Sent from my iPhone 

> On Jul 13, 2019, at 8:57 PM, Jason Sukey via Fot < [ mailto:fot at autox.team.net | fot at autox.team.net ] > wrote: 
> 
> Hello FOT, 
> Running my GT6 at the PVGP historics this weekend. I've sorted the braking system and installed new tires since the last time out. Now that I'm actually able to brake hard, I'm suffering from what seems to be fuel flooding, possible sloshing in the float bowls and dumping out the jet into the intake... 
> 
> During and immediately after a hard braking zone, the engine goes completely "off" and I can smell raw fuel. After a few seconds it clears out and runs strong in all other conditions, no indication of over rich or starving for fuel. Starts normally, no issues idling. 
> 
> Original fuel level in the floats was about 1/8" below the top of the jet. By reducing the fuel level in the bowls from there, the problem has somewhat improved, but it's still significant. Every session I adjust them a little further, but I'm not sure this is the right fix...maybe a band aid. 
> 
> Has anyone experienced this with the HS carbs? 
> 
> Jason Sukey 
> 
> 
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