<div dir="ltr"><div dir="ltr"></div>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.<div><br></div><div>Joe P.<br><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 14, 2023 at 12:03 PM Jim Adney <<a href="mailto:jadney@vwtype3.org">jadney@vwtype3.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 14 Dec 2023 at 9:16, Joe Plowick III wrote:<br>
<br>
> I have a T3 mechanical fuel pump that I would like to get a new diaphragm<br>
> for. It's a Brosol pump with a 4 screw top cover. Do they make kits for<br>
> these? The pump is in good shape and works, but the diaphragm is starting<br>
> to stiffen up after sitting and won't push fuel any more. Taking it apart<br>
> and moving it a little usually gets it working again.<br>
> <br>
> <a href="https://ibb.co/8cZsTnz" rel="noreferrer" target="_blank">https://ibb.co/8cZsTnz</a><br>
<br>
It's possible that the problem is not with the diaphram, but with the check <br>
valves. Clean any dried gas residue off them, or they can stick and not work.<br>
<br>
I don't know much about the mechanical fuel pumps, but, in general, old <br>
rubber parts that were in contact with gasoline for a long time tend to get <br>
quite stiff if they are allowed to dry out. The first thing I would try would be to <br>
let the diaphram soak in gasoline for a few days, to see if that helps.<br>
<br>
If that works, reassemble the pump with some grease on the non-gasoline <br>
side, to help keep some petroleum oil in contact with that side of the rubber.<br>
<br>
I don't recommend just flexing the rubber to soften it up; that's more likely to <br>
break it. <br>
<br>
I don't know if a kit for a different maker would fit. And those kits are getting <br>
scarce. You might have to resort to buying a new pump.<br>
<br>
I have some silicone diaphram material if you'd like to try making your own. <br>
This came from Russ, years ago, and should be quite good, but you'd have <br>
to cut and punch it to shape, and do the rivet in the center.<br>
<br>
-- <br>
*******************************<br>
Jim Adney, <a href="mailto:jadney@vwtype3.org" target="_blank">jadney@vwtype3.org</a><br>
Madison, Wisconsin, USA<br>
*******************************<br>
<br>
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