You might try to install a fuel pressure guage. That way you could look at
the guage when the situation occurs and see if you have fuel pressure. To
state the obvious, if pressure falls at speed, look at the pump, pickup,
lines, etc. If the pressure is good at the failure point, look at the
carb(s).
Mike
Michael Singleton
Sportscars Ltd
10170 Croydon Way
Suite M
Sacramento, CA 95826
(916)366-0330
mike@sportscarslimited.net
-----Original Message-----
From: mgs-bounces@autox.team.net [mailto:mgs-bounces@autox.team.net] On
Behalf Of Eric Erickson
Sent: Wednesday, April 07, 2010 11:11 AM
To: MGList List
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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