Webra fuel pressure regulator Order No. 3712 - RC Universe

2. The recommended method of mounting thepressure regulator is to use the mountingplate supplied (Fig. 4), which can be securedon top of one motor lug using the standard retainingscrews. The example illustrates onepossible option for which there is space inmost model helicopters. This method ofmounting ensures that the pressure regulatoris located in the immediate vicinity of the carburettor.The shorter the link to the carburettor,the more reliable the system! The pressureregulator itself is attached to the mountingplate by fitting the pressure regulator nozzlethrough the slot, and tightening the retainingnut over the shakeproof washer. Place thepressure regulator housing in the desired positionbefore tightening the nut fully. The outletnipple on the pressure regulator (marked“OUT”) can now be connected to the carburettorfeed nipple by means of a length of fueltubing.Fig. 4Mounting plate3. Connect the fueltank to the inlet nipple on thepressure regulator (marked “IN”) (Fig. 4). Wealways recommend that you use a fuel filter; ifyou prefer to install one outside the pressurefueltank, then it should be fitted in this fuelline.4. The next step is to connect the pressure regulatorto the silencer using another length offuel tubing. The nipple for this is located onthe rear face of the pressure regulator; connectthis to the pressure outlet nipple on thesilencer or tuned pipe (Fig. 5). The pressureline should be as short as possible; do notmake it any longer than physically necessaryto complete the connection.Fig. 5For the pressure and fuel feed lines it is important to use silicone fuel tubing with an internal diameter of2 mm or larger. Once you have completed all the connections, please check each one and ensure that it issecured properly. It is a good idea to secure the pressure lines on the nipples using hose clips.Do check that the fueltank does not leak, i.e. is completely sealed. The system can only work effectively ifthe tank and the filler valve are effectively sealed.Starting the motorPressure needs to be built up before you start the motor. This is done by sealing the outlet of the silencer ortuned pipe with a finger for a few moments while you fire up the motor. Release the outlet pipe immediatelythe motor starts. When the motor is running, you will find that the carburettor needs to be adjusted; this isinevitable due to the change in fuel supply conditions.2