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Weight of diesel fuel5/28/2023 ![]() Fill one bottle with the diesel fuel you are measuring about 3/4 fullģ. I used plastic water bottles of about 12 oz.ġ. Find the API corresponding to the SG at 60 F Normalize the measurement to 60 F temperature using a chartĮ. Calculate the specific gravity (SG) of the fuel using these measurementsĭ. Measure the temperature of the fuel when you weigh itĬ. Measure the weight of equal volumes of water and your diesel fuelī. Here are the steps to make the measurement for freeĪ. ![]() You can buy an API tester ($100+), which is similar in operation to the old style hydrometer battery tester, or you can run the test and calculation yourself. In order to do the injector return test, you must measure the API of the fuel you are using and use that value to determine what the correct pass/fail threshold is for the test.Īs far as I can tell, the API value for your diesel fuel is based on its specific gravity (measure of density) at a particular temperature.Īll of the measurements and calculations are done relative to 60 degrees F.
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