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MG MGA - how do SU electronic fuel pumps fail?

I reinstalled an electronic SU fuel pump that was working about 7 years ago on the car. It did not tick when I turned on the ignition to test the new wiring harness, using a 6-8 amp battery charger. I do have power to the pump, verified by a test light. When putting the charger leads directly on the pos and neg posts of the pump, all I hear is a slight high pitch sound with the charger drawing 1 amp. Any ideas as to a fix, or should I just replace it?

Thanks!
George
George G.

I'd put a points pump back in, but that's just my opinion. Electronic pumps usually fail suddenly and without warning.
Steve Simmons

George, the charger may be putting out a considerable DC ripple voltage, if the smoothing capacitors are gone or inadequate. Try the battery.
Art Pearse

Thanks Art, I'll try the battery on the fuel pump.
George G.

How do they fail? As Steve said.............suddenly. Mine just decided to literally "melt down". Fortunately I have a Facet wired in and could easily switch over. Despite it being 5 years old, Berlin weren't interested.
Allan Reeling

This thread was discussed between 14/07/2018 and 15/07/2018

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This thread is from the archive. The Live MG MGA BBS is active now.