Prevention is Better than Failure

[portzi]

Discopotatoes said:

portzi said:

Matthew Poxon said:

portzi said:

Hi Matthew,

with the braided hose is there any way to tell if the ethanol has degraded the fuel hose from within the braiding, you would have to strip the braiding off fist to inspect the outer fuel hose?

Hello Mark, I am not an expert on the matter but from what I understand, braided rubber is a bad idea as like you say you cannot inspect it for degradation. Plastic hoses such as PTFE are pretty much immune from the typical rubber perishing and or hardening due to the fuel, pressure, and heat. I would probably still change then every 10 years to be on the safe side however. I understand the braiding is to protect the hoses from damage.

Thanks for the explanation Matthew, so the PTFE coated hose is the best option. I too am no SME on this but is the coating just on the outside?

The PTFE is a liner on the inside of the hose to stop fuel smell from leaching through the rubber, manly used when fuel hose goes inside the vehicle

So the high concentration of Ethanol will not rot the PTFE liner?

[Discopotatoes]

No

[Matthew Poxon]

portzi said:

So the high concentration of Ethanol will not rot the PTFE liner?

From what I understand, and please accept that this is only what I have learned by researching on tinternet; that PTFE is suitable for up to E85 fuel (85% Ethanol) so will be a future proof solution as far a E10 and E15 goes. I am going to do some more research but will more than likely go down this route myself if it all checks out.

MORE TECHNICAL DETAILS ABOUT PTFE MATERIAL:
PTFE, or Polytetrafluoroethylene, comprises long-chain molecules of carbon atoms, each linked to two fluorine atoms.
The fluorine atoms provide a helical spiral which surrounds the carbon chain and protects it.
It is this structure which creates the unique properties for which PTFE is well-known.

Excellent Chemical Resistance
PTFE is renowned as the most chemically resistant material known. Only a very few, very unusual substances and conditions can affect it, like Fluorine gas at high temperature and pressure and liquid, boiling sodium metal. PTFE lined hoses can therefore be used for a wider variety of chemicals than any other hose type, making it the ideal choice for very corrosive chemical applications and multiproduct applications.

Source:
https://www.viperperformance.co.uk/plainpage.php?p...

Also note you need the correct PTFE fittings.

https://www.viperperformance.co.uk/45_fuel-hose-fi...

[portzi]

Matthew Poxon said:

portzi said:

So the high concentration of Ethanol will not rot the PTFE liner?

From what I understand, and please accept that this is only what I have learned by researching on tinternet; that PTFE is suitable for up to E85 fuel (85% Ethanol) so will be a future proof solution as far a E10 and E15 goes. I am going to do some more research but will more than likely go down this route myself if it all checks out.

MORE TECHNICAL DETAILS ABOUT PTFE MATERIAL:
PTFE, or Polytetrafluoroethylene, comprises long-chain molecules of carbon atoms, each linked to two fluorine atoms.
The fluorine atoms provide a helical spiral which surrounds the carbon chain and protects it.
It is this structure which creates the unique properties for which PTFE is well-known.

Excellent Chemical Resistance
PTFE is renowned as the most chemically resistant material known. Only a very few, very unusual substances and conditions can affect it, like Fluorine gas at high temperature and pressure and liquid, boiling sodium metal. PTFE lined hoses can therefore be used for a wider variety of chemicals than any other hose type, making it the ideal choice for very corrosive chemical applications and multiproduct applications.

Source:
https://www.viperperformance.co.uk/plainpage.php?p...

Also note you need the correct PTFE fittings.

https://www.viperperformance.co.uk/45_fuel-hose-fi...

Richard & Matthew, thank you for clearing up some points with fuel hoses, as we all immediately presume these fires are caused directly from an unserviceable hose, but there are alot of places where a fire can start from on a TVR

[Discopotatoes]

portzi said:

Matthew Poxon said:

portzi said:

So the high concentration of Ethanol will not rot the PTFE liner?

From what I understand, and please accept that this is only what I have learned by researching on tinternet; that PTFE is suitable for up to E85 fuel (85% Ethanol) so will be a future proof solution as far a E10 and E15 goes. I am going to do some more research but will more than likely go down this route myself if it all checks out.

MORE TECHNICAL DETAILS ABOUT PTFE MATERIAL:
PTFE, or Polytetrafluoroethylene, comprises long-chain molecules of carbon atoms, each linked to two fluorine atoms.
The fluorine atoms provide a helical spiral which surrounds the carbon chain and protects it.
It is this structure which creates the unique properties for which PTFE is well-known.

Excellent Chemical Resistance
PTFE is renowned as the most chemically resistant material known. Only a very few, very unusual substances and conditions can affect it, like Fluorine gas at high temperature and pressure and liquid, boiling sodium metal. PTFE lined hoses can therefore be used for a wider variety of chemicals than any other hose type, making it the ideal choice for very corrosive chemical applications and multiproduct applications.

Source:
https://www.viperperformance.co.uk/plainpage.php?p...

Also note you need the correct PTFE fittings.

https://www.viperperformance.co.uk/45_fuel-hose-fi...

Richard & Matthew, thank you for clearing up some points with fuel hoses, as we all immediately presume these fires are caused directly from an unserviceable hose, but there are alot of places where a fire can start from on a TVR

very true, just posted this in general, regards the Cerb fire,
http://kojaycat.co.uk/Tinned-Cube-Fuse-Battery-Ter...
the main battery terminal to starter is completely unprotected against chaffing this put a stop to that

Edited by Discopotatoes on Sunday 19th February 21:27