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What is the material used in fuel pump diaphragm ?
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twinfalls
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PostPosted: Sat Jul 16, 2005 4:59 pm    Post subject: What is the material used in fuel pump diaphragm ? Reply with quote

FEP ? PTFE ? Buna-N ?
May be it's more complex with layers of different materials.
Is there a commercial name ?
Where and who to ask that has the know how in this technology ?
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steponmebbbboom
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PostPosted: Sat Jul 16, 2005 7:06 pm    Post subject: Reply with quote

Why are you going this route again? Does the original diaphragm not have some plate riveted to it anyway?
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Blaubus
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PostPosted: Sat Jul 16, 2005 7:44 pm    Post subject: Reply with quote

my understanding is that viton is the only gas proof material, and there might be some synthetic reinforcement imbedded into the rubber material. riveting that metal plate couldnt be easy, but i am beginning to believe it is best to learn how to improvise- or else find a company that already does this and arrange a small production run. beats the hell out of 160 for a new pump
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steponmebbbboom
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PostPosted: Sat Jul 16, 2005 7:53 pm    Post subject: Reply with quote

I think neoprene is also a safe bet... Viton has almost the consistency of nylon. You couldnt make a diaphragm with that stuff.
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ratwell
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PostPosted: Sat Jul 16, 2005 8:55 pm    Post subject: Reply with quote

steponmebbbboom wrote:
I think neoprene is also a safe bet... Viton has almost the consistency of nylon. You couldnt make a diaphragm with that stuff.

It's good for push rod tube o-rings. What am I missing?

A lot of engine rubber seals are made from nitrile. If you look at most fuel German hoses they will be marked NBR (which is also called nitrile, Buna N). I'd use that.

I'd like to see how you make out on this project.
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twinfalls
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PostPosted: Sun Jul 17, 2005 2:04 am    Post subject: Reply with quote

steponmebbbboom wrote:
Why are you going this route again? Does the original diaphragm not have some plate riveted to it anyway?

Because there is no repair kit for the 1800's pump.
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PostPosted: Sun Jul 17, 2005 10:18 am    Post subject: Reply with quote

hmm... my OG pump is rebuildable as well... I dont like the sealed ones.
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PostPosted: Sat Jan 22, 2022 12:43 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

Anyone have a clue on the following kit?

https://www.ebay.com/itm/121215514863?hash=item1c3901f8ef:g:k9QAAOSwOnVgT9F7

States...

"Now SUPPLIED WITH Radke Services Efuel Safe / Alcohol Resistant, Heavy Duty Extended Life Replacement Accelerator Pump Diaphragm for Weber 40-44 &48 IDF carburetors as well as EMPI HPMX 40&44's.

Both Early spring loaded and Late included.

Not just an excellent replacement for any regular grade of gasoline, This will stand up to the various ethanol mix fuels around the country as well as High Octane race fuels 110 + ."
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PostPosted: Sat Jan 22, 2022 2:39 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

ask Bill at Sparxwerks where he buys his kits. His webpage says "OEM Effbe rebuild kits."
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PostPosted: Sun Jan 23, 2022 2:14 am    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

Just ship it up Bill. It’s better to support someone doing this for others, even when you can do it, so that he is there for those who can’t.
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PostPosted: Sun Jan 23, 2022 11:46 am    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

To the original question from about a century ago.....yes....Viton (but which viton?) is one of the best for gasoline and Buna-N is second best (and which formulation of Buna-N).

In reality any of the fluoroinated rubbers will do well with gasoline. Very little else will.....and Neoprene will not work with gasoline.

With the addition of ethanol (which is said by SOME not a problem with viton).....and by other sources under the term ethyl alcohol.....to not be good for viton....and a few other chemicals like toluene which is poor for viton....diaphragm materials like this are typically multi-layer to increase burn though time across a wider range of fuels.

Its a gamble these days. Ray
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PostPosted: Sun Jan 23, 2022 7:56 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

Yes, Bill at Sparxfarts is your guy. Not only does his work exemplify the best quality available but his communication is outstanding and he ships fast. I’ve dealt with him many times and he is a good guy
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PostPosted: Sun Jan 23, 2022 8:38 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

Thanks for the nice words everyone. Very Happy

Yes, I only install brand new Ethanol rated Effbe diaphragms on the dome top and square top type 1,2,3 and 4 fuel pumps.

I only rebuild the original Pierburg diaphragm assemblies after not being satisfied with any of the current reproduction fuel pump kits.

Effbe is the original diaphragm material supplier to Pierburg. They are still the best diaphragm material manufacturer today.

In the past few years, I rebuilt two different customers square top fuel pumps that were the original pumps on their 50 year old VW's. Both were the original owners of the VW's. Both fuel pumps still worked. They only had them rebuilt because they felt they got their money's worth after 50 years. Pretty impressive part for an economy car.
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PostPosted: Sun Jan 23, 2022 9:12 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

OP is in France
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PostPosted: Sun Jan 23, 2022 9:47 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

I won’t hold that against him
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PostPosted: Mon Jan 24, 2022 1:47 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

I am using one of these .. built in Europe by SSP.

https://www.heritagepartscentre.com/uk/113127025f-fuel-pump-for-100mm-pushrod-alternator-type.html

I checked the pressure- its 3.5psi.

It helps I live in the UK.

It is somewhat too tall for a progressive carburettor intake manifold - I had to Dremel away the manifold and then re-seal it with a JB weld/fibre glass cloth composite structure. (cleaned around hole, smeared JB Weld, put layer of epoxy compatible woven fibre glass cloth on top, more JB Weld and then a piece of plastic bag on top, put fuel pump in place ... ) Protrudes maybe 1/16" into airway, and moulded perfectly round pump top..
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PostPosted: Tue Jan 25, 2022 3:20 am    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

The diaphragms available for purchase?
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PostPosted: Thu Jan 27, 2022 3:44 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

Wolfsburg West is making the Effbe diaphragm kits. You can see Effbe in one of the pictures in their ads.

https://www.wolfsburgwest.com/cart/DetailsList.cfm?ID=111198553
https://www.wolfsburgwest.com/cart/DetailsList.cfm?ID=111198555
https://www.wolfsburgwest.com/cart/DetailsList.cfm?ID=113127141WW
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PostPosted: Thu Jan 27, 2022 3:53 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

SGKent wrote:
OP is in France

The "OP" posted this 16 years ago. Maybe he's moved since then Wink
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PostPosted: Thu Jan 27, 2022 5:07 pm    Post subject: Re: What is the material used in fuel pump diaphragm ? Reply with quote

Glenn wrote:
SGKent wrote:
OP is in France

The "OP" posted this 16 years ago. Maybe he's moved since then Wink


Effbe is in France.

https://www.effbe-diaphragm.com/en/contact/
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