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Re: Diesel leak at tank connection
There is a yellow coloured teflon tape that is for gas fittings, I've used that.
Edit: here's something about thread tape types, from the wiki:
"Thread seal tape used in plumbing applications is most commonly white, but it is also available in various colors. White PTFE is single density, yellow is double and pink is triple . It is often used to correspond to color coded pipelines (US, Canada, Australia and New Zealand: yellow for natural gas, green for oxygen, etc.). These color-codes for thread sealing tape were introduced by Bill Bentley of Unasco Pty Ltd in the 1970s. In the UK, tape is used from coloured reels, e.g. yellow reels for gas, green for potable water.
White – used on NPT threads up to 3/8 inch
Yellow – used on NPT threads 1/2 inch to 2 inch, often labeled "gas tape"
Pink – used on NPT threads 1/2 inch to 2 inch
Green – oil-free PTFE used on oxygen lines and some specific medical gasses
Gray – contains nickel, anti-seizing, anti-gailling and anti-corrosion, used for stainless pipes
Copper – contains copper granules and is certified as a thread lubricant but not a sealer
In Europe the BSI standard BS-7786:2006 specifies various grades and quality standards of PTFE thread sealing tape. "