I had a problem the other day with my 66 MGB/GT that I can't figure out.
It has been convereted to negative ground, and has a newish SU fuel pump
that has electronics controlling it rather than points.
We live in Flagstaff, AZ, elevation 7000 ft. The nights are getting into
the 20's F, and I suspect that the gas we are using this time of year is
the winter formulation.
We drove down to Sedona, which is at 5000 ft, and you drive a beautiful
two lane road through Oak Creek Canyon to get there. It was 95F when we
got there. On the way down, after driving for about 45 minutes, the car
started stumbling a little. I stopped to make sure the connections in the
ignition circuit were tight (they were), and continued on. On the way
back up, the stumbling returned, and finally the car quit. After opening
the hood, scratching my head, looking for anything obviously wrong for a
few minutes, I started it up again. When I turned the key to run, the
fuel pump went crazy for a few seconds, like it does when the float bowls
are empty after rebuilding the carbs. So, we drove up the road, when it
started stumbling again. I was thinking vapor lock, so we stopped for
lunch for an hour. After that hour, we had no further problems on the way
back to Flagstaff.
I am thinking this was vapor lock. My Dad, who owned a then new 67 BGT in
Colorado, says he never had a vapor lock problem with it. So, he thinks
it is the fuel pump. I think that gasoline is a lot different now than it
was in 1967, and the winter gas in hot weather could cause this problem.
I was wondering, what do you all think?
Thanks,
James Howard
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