Re: [Fot] SU HS6 problems during hard braking

["van.mulders.marcel--- via Fot" <fot@autox.team.net>]

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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@autox.team.net> 
Aan: "Jason Sukey" <jsukey@gmail.com> 
Cc: "fot" <fot@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@icloud.com | 
gblake58tr3@icloud.com ] > wrote: 

BQ_BEGIN

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@autox.team.net 
| fot@autox.team.net ] > wrote: 


BQ_BEGIN

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@aol.com | 
vfracing@aol.com ] > wrote: 

BQ_BEGIN
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@autox.team.net | fot@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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> 





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<html><body><div style=3D"font-family: Verdana, Arial, Helvetica, sans-seri=
f; font-size: 10pt; color: #000000"><div><br></div><div>Jason, I once had a=
 similar problem. I swore it was flooding, but in the end it was a loose co=
upling 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. Anot=
her possibility : the fuel line can be crushed somewhere i.e. by the engine=
 when it is moving forward under braking.</div><div>Marcel.</div><hr id=3D"=
zwchr" data-marker=3D"__DIVIDER__"><div data-marker=3D"__HEADERS__"><b>Van:=
 </b>"fot" &lt;fot@autox.team.net&gt;<br><b>Aan: </b>"Jason Sukey" &lt;jsuk=
ey@gmail.com&gt;<br><b>Cc: </b>"fot" &lt;fot@autox.team.net&gt;<br><b>Verzo=
nden: </b>Zondag 14 juli 2019 05:09:16<br><b>Onderwerp: </b>Re: [Fot] SU HS=
6 problems during hard braking<br></div><br><div data-marker=3D"__QUOTED_TE=
XT__"><p>We experienced this, but getting the pivots in the orientation
      you have them was the fix for us (in a TR-4).&nbsp; You can try a
      different top orientation though, assuming you have the float
      bowls with the 3 screws.&nbsp; The front carb is likely the problem -
      under braking the fuel goes to the front so the float drops.&nbsp; As
      soon as you stop braking the float bowl is overfull.</p>
    <p>Regards, Tony<br>
    </p>
    <div class=3D"moz-cite-prefix">On 7/13/2019 8:37 PM, Jason Sukey via
      Fot wrote:<br>
    </div>
    <blockquote cite=3D"mid:CAMmo4o_jpRJoTD-5=3Dq-Mc692usJfsDjQtGBV9igraR-L=
6MtHCg@mail.gmail.com">
     =20
      <div dir=3D"auto">The floats pivot so the swing front to back.&nbsp; =
&nbsp;On
        the rear carb the pivot pin is nearest the firewall, on the
        front carb the pivot pin is nearest the radiator.
        <div dir=3D"auto"><br>
        </div>
        <div dir=3D"auto">Thanks,</div>
        <div dir=3D"auto">Jason</div>
      </div>
      <br>
      <div class=3D"gmail_quote">
        <div dir=3D"ltr" class=3D"gmail_attr">On Sat, Jul 13, 2019, 9:29 PM
          Greg Blake &lt;<a href=3D"mailto:gblake58tr3@icloud.com"; target=
=3D"_blank">gblake58tr3@icloud.com</a>&gt; wrote:<br>
        </div>
        <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0
          .8ex;border-left:1px #ccc solid;padding-left:1ex">
          <div dir=3D"auto">What is the orientation of the pivot on the
            floats? &nbsp;<br>
            <br>
            <div id=3D"m_-3378539813793621208AppleMailSignature" dir=3D"ltr=
">Sent
              from my iPhone</div>
            <div dir=3D"ltr"><br>
              On Jul 13, 2019, at 8:17 PM, Jason Sukey via Fot &lt;<a href=
=3D"mailto:fot@autox.team.net"; target=3D"_blank" rel=3D"noreferrer">fot@aut=
ox.team.net</a>&gt;
              wrote:<br>
              <br>
            </div>
            <blockquote>
              <div dir=3D"ltr">
                <div dir=3D"auto">Phil, I'm running 2 psi.&nbsp; My fuel
                  pressure gauge stays consistent during the entire run.
                  <div dir=3D"auto"><br>
                  </div>
                  <div dir=3D"auto">Thanks,</div>
                  <div dir=3D"auto">Jason</div>
                </div>
                <br>
                <div class=3D"gmail_quote">
                  <div dir=3D"ltr" class=3D"gmail_attr">On Sat, Jul 13,
                    2019, 9:15 PM Phil Gott &lt;<a href=3D"mailto:vfracing@=
aol.com" target=3D"_blank" rel=3D"noreferrer">vfracing@aol.com</a>&gt;
                    wrote:<br>
                  </div>
                  <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0
                    .8ex;border-left:1px #ccc solid;padding-left:1ex">Jason=
;<br>
                    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.<br>
                    Phil Gott<br>
                    <br>
                    Sent from my iPhone<br>
                    <br>
                    &gt; On Jul 13, 2019, at 8:57 PM, Jason Sukey via
                    Fot &lt;<a href=3D"mailto:fot@autox.team.net"; rel=3D"no=
referrer noreferrer" target=3D"_blank">fot@autox.team.net</a>&gt;
                    wrote:<br>
                    &gt; <br>
                    &gt; Hello FOT,<br>
                    &gt;&nbsp; &nbsp; &nbsp; Running my GT6 at the PVGP his=
torics this
                    weekend.&nbsp; I've sorted the braking system and
                    installed new tires since the last time out.&nbsp; 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...<br>
                    &gt; <br>
                    &gt; During and immediately after a hard braking
                    zone, the engine goes completely "off" and I can
                    smell raw fuel.&nbsp; 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.<br>
                    &gt; <br>
                    &gt; Original fuel level in the floats was about
                    1/8" below the top of the jet.&nbsp; By reducing the fu=
el
                    level in the bowls from there, the problem has
                    somewhat improved, but it's still significant.&nbsp;
                    Every session I adjust them a little further, but
                    I'm not sure this is the right fix...maybe a band
                    aid.<br>
                    &gt; <br>
                    &gt; Has anyone experienced this with the HS carbs?&nbs=
p;
                    <br>
                    &gt; <br>
                    &gt; Jason Sukey<br>
                    &gt; <br>
                    &gt; <br>
                    &gt; _______________________________________________<br=
>
                    &gt; <a href=3D"mailto:fot@autox.team.net"; rel=3D"noref=
errer noreferrer" target=3D"_blank">fot@autox.team.net</a><br>
                    &gt; <br>
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