Parts made from Vamac® (AEM) compounds are used in under the hood applications where they are exposed to a combination of high and low temperatures and typically either engine oils or transmission fluids. Some AEM parts are also exposed to low levels of fuel and these parts perform well over the life of the car. Some end use requirements call for testing AEM compounds in (liquid) fuel. AEM compounds do poorly in fuel aging because of high volume swell and significant decreases in physicals. Aging AEM compounds in fuel does not reflect “real world” conditions. Some alternative testing procedures are discussed in this paper. AEM samples were aged in fuel using the “standard” liquid phase testing while other samples were aged in the vapor phase above the fuel. The AEM compounds aged in the vapor phase performed much better. In a separate study samples were aged in liquid fuel and then exposed to a dry out step. This step removed the volatile fuel absorbed by the compound during the fluid aging step. The dried-out samples had physical properties very close to the original properties which implies that the absorbed fuel did not do long term damage to the compound. The fuel aging studies in the lab were done at low temperatures. The actual end use temperatures are much higher and the fuel will be in the vapor phase. The “real world” operating conditions are difficult to simulate in the lab due to flammability concerns.