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I believe the problem with the pipes going gooey and the seals in the petcocks swelling is caused more from the use of alcohol in the fuel than the lack of lead .Here in the midwest they are adding alcohol to the fuel .That attacks the adhesive holding the seal in place in the petcock. It will also attack fiberglass tanks and also soften floats and ruin some tank sealers causing them to peel .
Lutz
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