Nice video!
Some guesses:
the fuel cap caused a vacuum in the tank - a neighbour had that once with
his 1976 golf GTI.
fuel pump intermediately malfunctioning - check electrical contacts
there also maybe either diode or capacitor inside the fuel pump with a lose
contact
if the pump is a traditional one (SU) it still may suffer of burnt contacts,
if so get these replaced or make them smooth again
dirt in the fuel line near the pump
Cheers,
Hans
71 BGT
----- Original Message -----
From: "Eric Erickson" <eric@erickson.on.net>
To: "MGList List" <mgs@autox.team.net>
Sent: Wednesday, April 07, 2010 8:10 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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