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MG MGB Technical - SU fuel pump life revisited, Thanks to David DuBoi

A little while ago we had a thread going about SU fuel pumps. I�m glad I saw it, and want to thank David DuBois for his input.

When I left Eureka, California for Louisville, KY, I got only about 130 miles south (just turned to CA hwy 1 off of 101 at Leggett for those who know the area) when the car quit. I ran sandpaper between the pump points to get it going again, but lost some confidence in the pump as a result.

Thanks to David�s comments and link, I had the part numbers for a replacement, as well as the knowledge that I could keep both pumps onboard.

I bought a spare pump before leaving Calif. as insurance, and sure enough, the car quit again about 50 miles west of Oklahoma City. Cleaning the points this time didn�t resurrect the SU, so I installed the new pump. Turns out that the problem weak ground line, and probably was all along, but I was testing with a test light instead of a VOM meter so I didn�t see the problem. After fixing the ground, both pumps worked, so now I have the double pump set up. It would have taken me a lot longer diagnose and fix the problem without David�s info, and time on the side of the Interstate does seem different. The peace of mind in the dead of winter from carrying and extra pump that you know will work; priceless.

So, thanks for the help David. I still have roadside wiring on the car, but it�s back in Kentucky now and I�ll add the deluxe wiring soon.

Charley
C R Huff

Charley - Good to hear that my articles and comments were a help. Cheers - Dave
David DuBois

So the 2 pumps need independant grounds then.
David Witham

David W,

Yes, both pumps need a ground, and both need a hot line. At the moment, to switch pumps, I would have to remove the wires from the SU and put them on the new pump. With some extra wiring and an on/on/off switch I could change over at the flick of a switch.

Charley
C R Huff

This thread was discussed on 26/01/2008

MG MGB Technical index

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