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MG MGB Technical - Dead fuel pump

I have a NOS +ve earth SU pump type AZX 1318 ready to go onto my '67 GT.

Whilst just getting it ready to bolt on, I decided to try it out to save having any problems later on.

Basically, it's totaly dead. I have tried giving it a light tap with a rubber mallet to the body, flicking the points but there is no sign of life. (The electrical feed is fine) The car is standard +ve earth.

This unit literally came straight out of the box, so to say I'm a bit miffed is an understatement.....

Any ideas of where to start?

N Dring

How long did this NOS pump sit on the shelf before being pressed into service? My bet is that the points have filmed over to the extent that they will not make contact at all and just need to be well cleaned. To clean them properly requires that you do some careful disassembly of the top end of the pump as follows:
Remove the upper set of contacts from the pedestal by loosening the 5BA screw at the back end of the upper contact spring. slide the spring out and scrub the contacts on a fine sharpening stone or some 400 grit sand paper on a sheet of smooth metal or a sheet of glass until the contacts are bright and shiny, then wipe them off with a solvent soaked rag and reinstall them.

To clean the lower contacts, you will need to remove the two 2BA mounting screws that hold the pedestal to the top of the coil housing and carefully rotate the pedestal back around the swivel pin that holds the lower toggle to the pedestal. Once the pedestal has been rotated back, clear of the lower contacts, you can scrub the contacts with a fine sharpening stone or 400 grit sand paper folded over a piece of flat metal until they bright and shiny. Finish up by wiping the points with a solvent soaked rag. Reassembled the pedestal and test the pump for proper operation. Cheers - Dave
David DuBois

Dave:

Thanks for the comprehensive fix-it guide.

I followed the sequence last night and everything is 100% now.

Cheers,

Nick.
N Dring

My new SU pump came with an insert saying to do just that before returning it as faulty, and needed it.
PaulH Solihull

This thread was discussed between 05/09/2010 and 09/09/2010

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