If you've been/were experiencing a 'stumble at cruise'
I'll bet you'll start noticing it again shortly. The flaky points
can and will be the cause of many cars stopping with
the driver having no clue as to the problem, but I'll lay
odds of dollars to donuts, the pump was/is not the
only problem causing an oscillation at cruise. btdt.
http://www.teglerizer.com/mgstuff/a_stumble_at_cruise.htm
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
From: "John Di Fede" <difejo@optonline.net>
To: "MG Mail List" <mgs@autox.team.net>
Sent: Monday, July 12, 2004 2:03 PM
Subject: SU Fuel Pump Tip
> To all;
>
> I normally lurk on this list.
>
> I recently uncovered a problem with the SU fuel pump on my 1973 MGB. This
tip may be helpful to someone experiencing a similar problem.
>
> My MGB would lose power and stumble between 3500-4500 rpms. I tried new
plugs and wires, ignition timing, carb tuning and checked for an intake
manifold leak. All with no success.
>
> I tested my fuel pump by disconnecting the fuel hose to the carbs, and the
pump conformed to the test specs I had. It was able to pump 1 pint in 15
seconds.
>
> So, I am out on a drive and all of a sudden my car dies, and I realize
that I cannot hear the SU pump tic, tic, tic. I rapped the pump and it
started working and I was able to get home.
>
> Once home, I removed the pump and discovered the points were in bad shape.
Replaced the points, and my loss of power problem disappeared.
>
> So my conclusions are that a pump can test ok, but not be able to keep up
adequate fuel pressure as RPM's increase, and that from now on I will be
replacing the fuel pump points as a matter of routine maintenance.
>
> BTW, this was a SU pump about 8 years old with 17k miles of use and always
garaged.
>
> I hope this tip helps.
>
>
> John Di Fede
> Hopewell Junction, NY 12533
> difejo@optonline.net
>
> 1973 MGB
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