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7.4.1 Fuel System Priming
This section explains how to prime the metering pump.
Use a backup wrench
when removing or installing the flare fittings, plugs or caps to ensure that you do not turn
threaded fittings or the preheater cap and create a leak.
1. Make sure the used oil storage tank has adequate oil, with oil level above the low fuel
cut off float switch (if equipped).
2. Ensure the fire-stop valve (if equipped), all hand valves, and the preheater valve are
open. (refer to figure)
3. Fill the Fuel Filter with fuel (pre-filtered used oil or non-synthetic, new ATF) to speed the
priming process and to reduce amount of air in system. Hand-tighten the filter (apply
thin film of oil to gasket).
4. Switch on the main power to the boiler, and make sure that the burner and preheater
are plugged in.
5. Have oil absorbing rags handy to catch oil.
6. Using a 7/16
” wrench, disconnect the outlet end of the small fuel tubing at the preheater
outlet (refer to figure).
7. Loosen the inlet fitting of the small fuel tubing and pivot it so that it is pointed down.
Then, re-tighten the fitting to seal during priming.
8. Place a container under the open end to catch oil coming out of the preheater.
Fuel tubing
Solenoid valve.
EL-200B
EL-375B / EL-500B
Fire stop valve open
Fire stop valve closed
Preheater valve
open
