Before the ethanol and biodiesel issues the main problem with FRP fuel tanks and mogas was the manganese content of that fuel which attacked some epoxy resins. There was a service bulletin from Diamond Aircraft which described the resin as going rubber like and then blocking filters. Limbach have always advised against mixing leaded with unleaded fuel. At least there is some quality control with avgas.
Apart from ethanol absorbing water it also is more prone to vaporising. Biofuels are great cleaners so change filters after your first tank full. Regards John Callahan ----- Original Message ----- From: Ashford To: 'Discussion of issues relating to Soaring in Australia.' Sent: Sunday, April 01, 2007 9:08 AM Subject: RE: [Aus-soaring] Unleaded with Ethanol and glass fuel tanks I can tell you that the content of petrol for cars could have anything in it. Of course the old lead compound used to be an octane enhancer and I know that Toluene is also used as an octane enhancer but despite how it comes from the refinery the lack of controls means that there is significant incentive for operators to add other substances to fuel and pocket the 45 cent excise. regards John Ashford 07 3822 4264 0409679867
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