Kinsler_Handbook_#32 December 2017

180 Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. www.Kinsler.com Phone (248) 362-1145 Fax (248) 362-1032 FUEL TANK CONSTRUCTION AND LOCATION OUTLET OF THE TANK The outlet of the tank or cell should be at the lowest point on the tank/cell. It is best if the main feed hose to the fuel pump runs down from the tank to the pump, NOT UP. Fuel pumps are not designed to draw fuel, they are meant to be gravity fed. Pumps will pull fuel because of the fuel siphon due to displacement. FITTING FOR OUTLET OF THE TANK Bore the inside diameter (I.D.) of the tank outlet and pump inlet fittings as large as possible without unduly weakening the fitting. Chamfer the fitting on the tank outlet as shown at the right. Kinsler hard-anodized fittings are designed like this, see FITTINGS on Page #183. NEVER use a “drilled block of metal” type angle fitting on ANY pump inlet hose... where the drills intersect there is a razor sharp edge that promotes pump inlet cavitation. The best solu- tion is to make gentle bends with the hoses. However, if there is a really tight place, use a bent tube type hose end fitting. VENT SIZES The tank MUST have a vent. Large amounts of fuel volume are being removed from the tank. This volume must be replaced or a vacuum may be formed inside the tank, causing the fuel to be ‘locked’ inside. Scenario - a straw in a drinking glass: put a finger on the end of the straw and lift it out of the liquid; the straw retains the liquid until the finger is removed and allows air in. NOTICE : Fuel tank and cell manufacturers may NOT offer a tank that is properly configured for your application. Too large of a vent will not hurt anything, too small may cause the pump to cavitate, resulting in an inconsistent fuel supply or damaged engine parts. Remember when altering a vent by adding length (hose), installing a roll-over valve, or a filter, the vent may require a larger inside diameter (see ORIFICE THEORY on Pages #202-203). For pump sizes of -00 up to -1 3/8” (.375”) inside diameter or bigger MINIMUM ALLOWABLE TANK VENT SIZES: For pump sizes of -2 up to -4 1/2” (.500”) inside diameter or bigger. For pump sizes of -5 or bigger 3/4” (.750”) inside diameter or bigger. Please consult your rule book/sanctioning body for additional requirements. NOTE: When running multiple pump systems multiply the area of the above vent sizes by the quantity of fuel pumps. LIQUID BOILING VERSUS BAROMETER AND TEMPERATURE This subject is very complex, we are only going to discuss it in very general terms. There are many chemistry books, scientific papers, and web sites that can help further the understanding of this topic. The boiling point of a liquid is affected by temperature and absolute pressure. Absolute pressure takes into consideration altitude. The temperature at which the vapor pressure of the liquid exceeds the pressure around the liquid is the boiling point. At temperatures below the boiling point, evaporation takes place only from the surface of the liquid; during boiling, vapor forms within the body of the liquid. As the vapor bubbles rise through the liquid, they cause the turbulence and the conditions that are associated with boiling. When the pressure against a liquid is increased, the boiling point goes up. When the pressure on a liquid is reduced, the boiling point goes down. The lowest boiling point is that of helium, -452 0 F (-268.9 0 C). The highest is probably that of tungsten, about 10,650 0 F (5900 0 C). Water is generally 212 0 F at one standard atmosphere pressure (29.92” Hg). © 2017 See also KINSLER VAPOR SEPARATOR TANK SYSTEM / PRESSURIZED PUMP INLET SYSTEM on Pages #115-118.

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