[Fot] Fuel Pressure

[Tony Drews]

Rod, SU's without grose jets (don't use those) should be fine at 3 psi 
in my experience.  We were able to run them up to 6 or 7 psi when pushed.

If the regulator works fine for you, no issues.  A problem we ran into 
years ago was fuel shutting off at the end of long straights (like at 
Road America - 3 1/2 mile long straights).  Eventually we figured out 
the regulator was getting deadlocked - the differential between the 
input and output pressure wasn't enough to keep it cycling so we had to 
go to a higher pressure fuel pump.  There's actually a regulator in the 
pump as well and that can fight the downstream one apparently.  If it 
aint broke, don't fix it - but if you run into issues with fuel 
starvation after long pulls it's something to look into.

No input on the spark plugs.

Regards, Tony Drews

On 3/10/2023 11:22 AM, Rod Pierce via Fot wrote:
> I recently acquired a fuel pressure checking kit so I decided to check 
> the fuel pressure going into and coming out of the regulator on my 
> Spitfire.   I had about 6 psi going in and 3 psi coming out.  Just as 
> it should be, or at least that is what I have heard.  I have dual SUs.
>
> I'm looking for confirmation or thoughts about the fuel pressure.
>
> Also, what spark plugs to use with my newly rebuilt 1300 with a shaved 
> head and forged pistons.  I'm running 110 octane.  I don't doubt this 
> discussion has been had already so if somebody can direct me to a 
> thread that would be great.
>
> Thanks
>
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