sports850 wrote:
Whatever you are going to use , if it doesn't say it's suitable for fuel tanks check with the manufacturer and keep the correspondence so you can abuse the #$@$#@ out of them if it's a problem in the future . I was talking to someone recently at a vintage car display who'd just had to replace the fuel lines , clean the tank and strip and clean the carb because some clown at an auto parts place told him a silicon type product was suitable to use to seal around the neck of the fuel filler , coated the internal surfaces of the fuel lines with crud to the point it reduced the diameter by half . You can imagine the carb after that as well .... Be careful what you use with fuel , also check if it will work with ethanol blends as it looks like the way things are headed ....
Even if you do check with the manufacturer, just to be safe, put some of the rust converter or sealant or whatever in a container, then fill it up with fuel, and leave it for a week or so and see what happens. That will give you a good indication of whether or not it will be safe in the fuel or not, or whether the fuel will dissolve it or soften it or anything. That is unless you use a product designed to seal fuel tanks
