Mark, I had the same problem with one of my Healeys. It was caused by a
cheap after market filler cap.
On Mon, Jun 30, 2014 at 6:03 AM, Mark J Bradakis <mark@bradakis.com> wrote:
> I worked on a car a while back that was exhibiting similar symptoms, but
> it was a late rubber bumper
> MGB with various emissions stuff on it. There was one particular hill
> where it alwayshad problems.
> I had been over everything I could think of, and could not figure it out.
> So after trying something
> I took it for a road test and as usual had problems getting up this
> particular hill. I pulled off to
> the side, parked, and got out, walking around the car, thinking. On one
> trip around the back of the
> car I took the gas cap off, and as I was doing so a HUGE rush of air went
> into the tank.
>
> The main problem was a blocked vent line, so the sealed fuel system could
> only let out so much gas
> before the vacuum was more than the pump could handle. It ran better, but
> it was still a dog ;-)
>
> mjb.
>
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