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MG MG Y Type - Brass fuel pump

Hello, I'm a visitor from the B forum but thought owners of older cars would best be able to help.

I bought a box of SU pumps for spares and restoration and have come across a base that is made of brass. It has the following numbers stamped on it

6D
68404

Can anyone tell me what it is from and more importantly, what sort of top goes with it. By that I mean one or two contact points, the style of top cap and any other info. I would like to restore this to it's former glory.

Thanks

Tony
Tony Oliver

I have equipped with SU fuel pump of the brass.
This SU pump was purchased from E-BAY around March, this year. The number of 9B103813 is on the body of brass. This pump was DC6V specification. I wound up the coil according to 12V voltage of Y-type, and restored SU pump. The enameled wire currently used for SU pump of 6V was 0.8mm. SU pump of brass is shining in the bonnet. I display a picture.

Thanks Masaaki



XPAG Masaaki Sakaguchi

Thanks Masaaki. That looks exactly like mine except I haven't got the screw on terminal at the top. Does yours have one or two contact points.

Thanks
Tony
Tony Oliver

Hi Tony

I am using 2 point-of-contact type.
Moreover, I am inserting the diode for contact protection.

I display a picture.

Masaaki

XPAG Masaaki Sakaguchi

Thanks again Masaaki. On one of my 12V pumps I have used the transistor method as designed by Dave DuBois. Now have no arcing at all. Very happy with the result.

Tony
Tony Oliver

Just for the record, all of the early low pressure pumps (by early, I am referring to pumps made prior to 1980 or there abouts) had single contact points sets. They also came without the adjustment tangs that are on the sets available today and were more difficult to adjust.

Massaki - Instead of a diode, if you use one of the newer, Transient Voltage Suppressors (part number P6KE18CA), the points will be protected as well as with a diode, but it won't be slowed as it is when using a diode. Additionally, the TVS is bi-directional so it doesn't make the pump polarity sensitive.

Tony - "I would love details of the optical system, things like that fascinate me."

As I described in my e-mail to you, that old design has its own problems, in that with no arcing at the points, the film that is developed is not burned off and will eventually cause the pump to fail. Massaki's method of using a diode (or a TVS), minimizes the arcing but still keeps the film burned off. Cheers - Dave





David DuBois

Hi David
Thank you very much.

It seems that TVS(Transient Voltage Suppressors)is being used for the latest new SU fuel pump.
TVS does not choose +-. It is easy to use it.

A diode feels my comment a little that arcing absorption is good compared with TVS.

However, a little arcing is still generated. Moreover, SU pump which has attached neither a diode or TVC becomes a defect of operation easily.

Thanks--Masaaki
XPAG Masaaki Sakaguchi

This thread was discussed between 01/06/2008 and 08/06/2008

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