Doug:
This is a common question.
Since the pump diaphragm is wanging in and out, dust tends to get sucked
into the coil and points areas. The later design pumps incorporated vents
that could be plumbed to areas of clean air. The later MGBs had short
lengths of windshield washer type tube that connected inside the trunk in a
tee, with the third leg allowing the pump to vent into the relatively clean
air in the trunk. It's easy to duplicate this setup, or just ignore the
vents.
The threaded bosses are for alternate mounting of the pump. In the MGB
application the pump is held by a ring mount around the body. This type of
pump can also be installed in cars like the MGA or Big Healey where the pump
is bolted to a rubber isolated mounting plate.
Kelvin.
> -----Original Message-----
> From: Douglas Gaither [mailto:dgaither@northeastassembly.org]
> Sent: Tuesday, April 01, 2003 9:17 AM
> To: mg list
> Subject: 'What's this on my fuel pump?'
>
>
> I have just purchased a new SU to replace the fuel pump I had
> previously.
> The previous fuel pump (although an SU) didn't match any
> diagrams in the
> manuals. Anyways, I have a '66B that I'm switching to
> negative ground. So
> this new SU has a little nub for a hose of some sort right at
> the bottom of
> the main body. It also has a little 'vent' on the top of the
> unit. There
> are also threaded bosses on the bottom of the unit. My questions are:
>
> 1) What do I do with those little nubs?
>
> 2) What are the threaded bosses for?
>
>
> TIA,
>
> Doug Gaither
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