FUEL SYSTEM - N.14Fig. N.19Unscrewing Vent Plug on lop of Filter Cover.pipe is square to the unions at each end as describedpreviously, no force will be needed to make a good joint.Use only a standard open ended 5/8 in A.F. spanner.If the union is tightened excessively the olive maycollapse and split. The same danger exists if the pipe isnot square to and central with the union.When changing an atomiser always remove the pipeentirely. Never disconnect one end only, leaving theother end tight. Never bend the pipe.PRIMING THE FUEL SYSTEMThe air must be vented from the fuel systemwhenever any part of the system between the fuel linkand injection pump has been disconnected for anyreason, or when the system has been emptied of fuel.Fig. N.20.Slackening Vent Valve on Hydraulic Head LockingScrew.Fig. N.21.Slackening Air Vent Valve on Governor Control Cover.No attempt must be made to start the engine untilthe injection pump has been filled and primed as seriousdamage can be caused to the pump due to lack oflubrication.The method of priming detailed below, ensures thatonly fuel which has passed through the paper filterelement can reach the interior of the pump.To bleed the system, proceed as follows:—1.Unscrew by two or three turns, the vent plugon top of the fuel filter cover (not the returnpipe to the tank). See Fig. N.1). Later typefuel filters are self venting and do not have avent plug. Air vent the fuel filter by removingFig. N.22.Operating the Hand Priming Leveron the Fuel Lift Pump.
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