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Please update us on what you find. Silicone tubing deteriorates differently than rubber, and the grades of silicone rubbers vary a lot.
I used an 'automotive' silicone tubing on a non-SAAB to connect a PCV valve, and it swelled with oil. It allowed enough of the lighter combustion byproducts to permeate it so that the engine compartment constantly smelled as if I had an oil leak. Changing to a 1/4" ID fuel line and using just a couple of inches of the silicone to adapt the fuel line to the extra-small nipple got rid of the smell.
I have re-plumbed my two daughters' 9-5's with silicone vacuum hoses, so with your input here, I will inspect those next chance I get. SAAB used a lot of hard pipes, and it may be that all the places they used rubber hose will be kind to the silicone tubing.
Mark in Marine
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