| Author |  Topic  | |
melle
V4 Guru
United Kingdom
3833 Posts |  Posted - 26 Sep 2014 : 23:46:19  
| Where do I buy material to cut new membranes for fuel pumps and carburettors? I'm too thrifty to buy new Weber choke and power valve diaphragms whilst it's easy enough to replace the membranes.
Same for fuel pumps, why throw good pump bodies away instead of simply replacing the membrane? Seems to be a very uncommon idea these days...
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V |
|
dansp1
V4 Beginner
51 Posts | |
melle
V4 Guru
United Kingdom
3833 Posts | Posted - 27 Sep 2014 : 13:41:21
| That was in my eBay watch list already.  Thanks!
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V |  |
|
melle
V4 Guru
United Kingdom
3833 Posts | Posted - 27 Sep 2014 : 13:49:39
| Does anyone know what thickness I should buy for a fuel pump? I don't have one here to measure the membrane... 0.5mm should do for the carb diaphragms.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
|
melle
V4 Guru
United Kingdom
3833 Posts | Posted - 28 Sep 2014 : 14:38:03
| Hmm, the Weber membranes measure 0.1mm, so 0.5 Viton seems a bit too much. Might just try it though if I can't find thinner stuff. If it doesn't work I can always revert and buy new parts.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
|
melle
V4 Guru
United Kingdom
3833 Posts | Posted - 11 Jan 2015 : 18:59:36
| Result! Laser cut out of (imitation) Viton I bought off eBay:
The others are paper gaskets for a Weber 32/36 DGAV.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
|
beta
V4 Fanatic
Ireland
278 Posts | Posted - 11 Jan 2015 : 20:02:28
| Well done Melle !!
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Derek
V4 Guru
United Kingdom
2191 Posts | Posted - 11 Jan 2015 : 22:32:17
| | How are you going to fit them? Drill out and then use some sort of blind rivet? | |
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melle
V4 Guru
United Kingdom
3833 Posts | Posted - 12 Jan 2015 : 07:17:41
| I'm using an M2 bolt with a countersunk head.
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
|
Derek
V4 Guru
United Kingdom
2191 Posts | Posted - 12 Jan 2015 : 13:41:35
| | Accelerator pump diaphragm has an easy life but the fuel pump is bashing away continuously at a pretty high rate, more like a vibration, so I'd think that some very high lock Loctite, which can stand up to oil and petrol, would be a very good idea. | |
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beta
V4 Fanatic
Ireland
278 Posts | Posted - 12 Jan 2015 : 14:14:04
| Hi Melle
Did you make many of those intermediate plate gaskets - I could offer my car as a test bed for the first batch !!
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melle
V4 Guru
United Kingdom
3833 Posts | Posted - 12 Jan 2015 : 17:30:03
| Paul, I anticipated on your question, come pick some up at your nearest leisure.
Derek: the membranes you see in the photo are for the power valve and the choke of a Weber 32/36DGAV carb, those will be installed using an M2 bolt and medium strength thread lock. I haven't cut a fuel pump membrane yet, but you're absolutely right that this will be under significant stress during its life. Luckily I can use a bigger diameter and longer bolt there, now with a stronger type Loctite/ PermaBond. Using a blind rivet might be an even better alternative though, any opinions?
1970 96V4 "The Devil's Own V4"
1977 95V4 van conversion project
1988 900i 8V | |
|
| | Topic | |
Fuel pump/ carburettor membrane material
