John,
I had a similiar problem several months ago. Same result.
Jim
70B
69C
>From: John Di Fede <difejo@optonline.net>
>Reply-To: John Di Fede <difejo@optonline.net>
>To: MG Mail List <mgs@autox.team.net>
>Subject: SU Fuel Pump Tip
>Date: Mon, 12 Jul 2004 11:03:56 -0700
>
>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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