Lotus Elan

E10 fuel and fuel pump diaphragm

PostPost by: quaybook » Wed Sep 15, 2021 7:14 pm

With the introduction of E10 fuel in the UK, should I be concerned about the diaphragm in the standard Ford mechanical fuel pump? If the diaphragm perforates it can leak petrol into the sump, contaminating the oil. If the leak is small and pump pressure still adequate this could continue for some time unnoticed with the potential to cause excessive wear?
I have been using Ethanolmate additive in my fuel since the introduction of E5 petrol but, as I understand it, this additive only protects against corrosion and assists fuel stability, it does not help with so called 'material incompatibilities'.
I am also concerned about the gasket to sender in the fuel tank. I replaced my tank a few years ago and recall that the replacement alloy tank had a cork gasket and cork is most certainly incompatible with Ethanol.
Any thoughts?

Vernon
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PostPost by: HCA » Thu Sep 16, 2021 5:34 am

I doubt there are many, if any, synthetic rubber chemists on the forum to answer your question. I would suggest the question is directed to the manufacturer of the products on which you have concerns....
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PostPost by: rgh0 » Fri Sep 17, 2021 12:08 pm

I used to manage a synthetic rubber manufacturing plant :) does that qualify :lol:

You just need to find out what the diaphram is made of and then determining ethanol resistance is easy. Most of the likely candidates have good resistance so I would not worry to much

see link below
https://mykin.com/rubber-chemical-resistance-chart-3

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PostPost by: quaybook » Fri Sep 17, 2021 1:32 pm

Rohan, you are a gem! Thanks so much for both the assurance and the invaluable link. What would we do without you on this forum.

Vernon
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PostPost by: rgh0 » Fri Sep 17, 2021 10:06 pm

quaybook wrote:With the introduction of E10 fuel in the UK, should I be concerned about the diaphragm in the standard Ford mechanical fuel pump? If the diaphragm perforates it can leak petrol into the sump, contaminating the oil. If the leak is small and pump pressure still adequate this could continue for some time unnoticed with the potential to cause excessive wear?
I have been using Ethanolmate additive in my fuel since the introduction of E5 petrol but, as I understand it, this additive only protects against corrosion and assists fuel stability, it does not help with so called 'material incompatibilities'.
I am also concerned about the gasket to sender in the fuel tank. I replaced my tank a few years ago and recall that the replacement alloy tank had a cork gasket and cork is most certainly incompatible with Ethanol.
Any thoughts?

Vernon



I would not worry about cork and ethanol either --- at least it seems OK in my wine bottles with 14% ethanol and brandy with around 40% :D

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PostPost by: quaybook » Sat Sep 18, 2021 10:32 am

Like I said Rohan, you are a gem :lol:

I can only say Cheers!

Vernon
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PostPost by: Witofthestaircase » Sat Sep 18, 2021 4:23 pm

If not omnipresent, at least of infinite wisdom!
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