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

[atweditor at aol.com]

 Eric,
Nice driving.

This may be too obvious, but how about collapsing fuel lines?

Jay Donoghue

 72 MGB-GT
66 Mustang






-----Original Message-----
From: Eric Erickson <eric at erickson.on.net>
To: MGList List <mgs at autox.team.net>
Sent: Wed, Apr 7, 2010 2:10 pm
Subject: [Mgs] Back on track (Part 2 - fuel starvation)


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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