It doesn't make sense to claim that a field placed on the fuel line would thin gas/diesel. The hydrocarbons in oil are not polar molecules so they are not affected by fields. One of the first steps that happen when refining raw crude oil is to pass it through a vessel with a large electric field. The purpose is to filter out some of the contaminates (disolved salts, etc.) from the oil. The contaminates are drawn to one side of the field where they can be diverted out of the flow while the crude oil passes through the vessel.
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It doesn't make sense to claim that a field placed on the fuel line would thin gas/diesel. The hydrocarbons in oil are not polar molecules so they are not affected by fields. One of the first steps that happen when refining raw crude oil is to pass it through a vessel with a large electric field. The purpose is to filter out some of the contaminates (disolved salts, etc.) from the oil. The contaminates are drawn to one side of the field where they can be diverted out of the flow while the crude oil passes through the vessel.