Kinsler_Handbook_#32 December 2017

Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. www.Kinsler.com Phone (248) 362-1145 Fax (248) 362-1032 112 PREFERRED PLUMBING SCHEMATIC FOR CONSTANT FLOW This Preferred Plumbing Schematic will give the same results as the “Old” style plumbing schematic we recommended in the past, but this Preferred Schematic will supply filtered fuel to main, secondary, and high speed bypass. Unfiltered fuel may stick the poppets in the main and secondary, and it clogs up the high speed bypass. Placing the fuel shutoff valve at the barrel valve has an advantage. When the engine is shut off, the fuel in the filter and hoses picks up heat and expands. By having the shutoff at the barrel valve, this expanding fuel is forced back toward the fuel tank rather than into the engine. Never plumb any of the bypass valves back to the fuel pump inlet. When they blow off, they make some vapor, which we don’t want going back through the system. To obtain good fuel supply to the pump, locate it as low as possible, and the fuel tank as high as possible, but don’t locate the top of the tank above the level of the nozzles. See FUEL TANK CONSTRUCTION AND LOCATION on Page #177. © 2017 • For pump inlet hose size, see MECHANICAL PUMPS on Page #98. • The proper coarse screen filter maybe added on the fuel pump inlet hose to protect the pump, see FUEL FILTERS on Pages #161 and #163. • To protect the fuel pump, strain all the fuel as the fuel tank is filled, use a filter funnel, see FITTINGS AND BUNGS on Page #179. • Do not use paint strainer or rags to strain the fuel as they give off lint, which plugs the nozzles. • If you place a shutoff valve in the pump inlet line, you must not shut it off above an idle or you may damage the pump... the fuel flow lubricates the gears. We strongly prefer the fuel shutoff at the barrel valve. • For tank vent size see FUEL TANK CONSTRUCTION AND LOCATION on Page #177. NEVER use a “drilled block of metal” type angle fitting on ANY pump inlet... where the drilled holes intersect there is a razor sharp edge that promotes pump inlet cavitation. The best solution is to make gentle bends with the hoses. If you have a really tight place, use a bent tube type hose end fitting. The secondary and high speed bypass valves may be teed together on their outlet sides so that they share a common return hose, or the two valves may be plumbed on separate return hoses.

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