[Mgs] Back on track (Part 2 - fuel starvation)

[Paul Root]

What is the head configuration and carbs?

Even with better breathing, I don't think the pump would run out of fuel for 1
1/2" carbs.
If you have a DCOE, then maybe.

On Apr 7, 2010, at 1:10 PM, Eric Erickson wrote:

> Following on from my previous post, this video shows me up against a
slightly
> more modern, more powerful MG -  and not doing such a bad job (although
> modifying my lines like I thought I could outgun him out of the corners was
> not real smart).
>
> BUT my biggest issue that day came with the engine running out of fuel at
> critical moments.  Stuttering and stumbling (yes, I have annotated the
video
> to point out the obvious) in both third and fourth gear after a couple of
> laps.
>
> When I got off the track and popped the bonnet I immediately saw that the
> fuel-filter was empty.  I pulled off the fuel line and started up the
pump...
> and it pumped fuel.  There was plenty of fuel in the tank (in fact, thinking
I
> was low on fuel, I slightly over-filled it and it did exactly the same
> thing).
>
> There were two possibilities that came to mind (you may have others).
>
> 1.  It was hot day (made worse by humidity) at 33C/91F+ - so I was thinking
> vapourisation/vapour-lock, but I have run in hotter weather and never
suffered
> this issue before.
>
> 2.  This engine is bigger than it has ever been at 1950cc with the same SU
> fuel pump as when she was 1840cc - could I need a higher capacity fuel
pump?
>
> Any thoughts?  How should I be measuring fuel flow at 5000+ revs (which is
> when she stuttered and stumbled)?
>
> And the video.....
>
> http://www.youtube.com/watch?v=L5w47B6QN4Q
>
>
> Thoughts?
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