[T3] Mechanical Fuel pump kit

[Joe Plowick III]

The issue appears to be the diaphragm getting stiff.  The pump had worked
beautifully before, but then I hadn't ran the engine for a few months.
When I tried it again, it wasn't pumping fuel.  I removed the top cover and
the diaphragm wasn't very flexible.  I sprayed everything out with carb
cleaner and flexed the diaphragm which freed it up. After that, it started
working again.  The rest of the pump inside looked brand new.  I just
haven't come across a replacement that matches.  I have a Pierburg pump as
well that didn't work for me last time I tried, and probably needs a
rebuild as well.  I may have to dig that one out and see if it's got a
different design and better parts availability.

Joe P.


On Thu, Dec 14, 2023 at 12:03 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 14 Dec 2023 at 9:16, Joe Plowick III wrote:
>
> > I have a T3 mechanical fuel pump that I would like to get a new diaphragm
> > for.  It's a Brosol pump with a 4 screw top cover.  Do they make kits for
> > these?  The pump is in good shape and works, but the diaphragm is
> starting
> > to stiffen up after sitting and won't push fuel any more.  Taking it
> apart
> > and moving it a little usually gets it working again.
> >
> > https://ibb.co/8cZsTnz
>
> It's possible that the problem is not with the diaphram, but with the
> check
> valves. Clean any dried gas residue off them, or they can stick and not
> work.
>
> I don't know much about the mechanical fuel pumps, but, in general, old
> rubber parts that were in contact with gasoline for a long time tend to
> get
> quite stiff if they are allowed to dry out. The first thing I would try
> would be to
> let the diaphram soak in gasoline for a few days, to see if that helps.
>
> If that works, reassemble the pump with some grease on the non-gasoline
> side, to help keep some petroleum oil in contact with that side of the
> rubber.
>
> I don't recommend just flexing the rubber to soften it up; that's more
> likely to
> break it.
>
> I don't know if a kit for a different maker would fit. And those kits are
> getting
> scarce. You might have to resort to buying a new pump.
>
> I have some silicone diaphram material if you'd like to try making your
> own.
> This came from Russ, years ago, and should be quite good, but you'd have
> to cut and punch it to shape, and do the rivet in the center.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
> _______________________________________________
> VWType3.Org mailing list - type3 at vwtype3.org
> To unsubscribe or change subscription options, visit:
> http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org
> If you need more help, contact: gregm at vwtype3.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.vwtype3.org/pipermail/type3-vwtype3.org/attachments/20231214/76f0c8f2/attachment.htm>