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silicon and fuel

Posted: Mon Jan 25, 2016 9:50 am
by whisper
When installing the fuel level sender unit in one of IFH's lower tanks recently I elected to use red RTV type silicon as a sealant on the gasket. BIG MISTAKE :twisted:

When screwing in one of the mounting screws a small "sausage" of silicon fell into the tank. This then morphed into something many times the size and finally lodged itself in the fuel transfer pump.

A small piece also made its way into the main tank. Fortunately that has a finger filter at the outlet so the engine was never starved of fuel.

Lessons learnt
1) Never use a silicon based sealant anywhere near fuel....ever!
2) Use finger filters at all tank outlets (even ferry tanks)
3) Install a filter on the line between the ferry tank and main tank

Pics show the difference in size between the same blob of silicon before and after being immersed in fuel.

Re: silicon and fuel

Posted: Sun Jan 31, 2016 8:20 pm
by Johan Nortje
The same happened to me in 2006 when I use silicone to seal the sensor on the main tank. In my case the result was an engin out while still close to the airfield. I could glide back and land safely. After inspection the silicone block the fuel filter.