Ah-ha. If this is a points type pump a couple years old, I have some
detailed information that may explain this mode of failure
(maybe). A friend ran into this probelm with a Moss supplied points
type fuel pump almost two years ago. With the electrical end open on
the bench it was easy enough to see why it was going whacky, and
customer credit was proffered for the defective part.
Until now this was a single isolated incident, no other reports of
similar failure, so no way to know if it was a single bad part or
possible a bad production batch. As last known Burlen was ignoring
the issue, and distributors would continue to sell the parts as-is
unless there would be more complaints (and significant returns of
course). See here:
http://mgaguru.com/mgtech/faulty/ft037.htm
You will have to open the electrical end of the pump (remove cover
for inspection). Do tell if you may find the same fault here.
Barney Gaylord
1958 MGA with an attitude
http://MGAguru.com
At 04:12 PM 1/10/2010 -0800, Max Heim wrote:
>My MGB has been suffering from what seems to be fuel delivery problems, so I
>just attempted this test. I attached a length of spare hose to the exit of
>the fuel filter and ran it onto an open container (a measuring cup from the
>kitchen). It was only a US pint container, so I didn't expect to be able to
>run for a full minute.
>
>When switched on, it started off fast, filling about 2/3 cup in less than 15
>seconds. But then it stopped all by itself, so I switched off after 30
>seconds.
>
>If this is what it has been doing in operation, it would completely explain
>the symptoms. After driving at freeway or expressway speed for a few miles,
>the engine would sputter and lose power. After pulling over, I would hear
>the fuel pump kick back in, and after a minute, I could accelerate away
>smartly. In city traffic, it never had a problem, presumably because sitting
>at idle at traffic lights would give the pump a chance to catch up.
>
>This is a replacement SU pump from Moss that I only installed in late 2006.
>Its predecessor failed in a similar manner, but only after at least 25 and
>possibly 40 years.
>....
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