Are you saying that the warning horn starts to sound the instant you turn the key to the run position (not running), just simply turning the key to the RUN position?
If this is the case, while the horn is sounding, remove the TAN wire from the warning horn. If the beeping continues, the horn is faulty.... if the beeping stops immediately, either the TAN iwre is grounding out somewhere OR (and most likely) one of the sensors at the engine has failed... (2 Overheat Sensors, Fuel Restriction Vacuum Valve, VRO Circuitry).
Reverting to pre-mix is done as follows.
(
VRO Pump Conversion To Straight Fuel Pump)
(J. Reeves)
You can convert the VRO pump into a straight fuel pump, eliminating the oil tank and VRO pump warning system, but retain the overheat warning setup (and fuel restriction warning if so equipped) by doing the following:
1 - Cut and plug the oil line at the engine so that the oil side of the VRO pump will not draw air into its system. Trace the wires from the back of the VRO to its rubber plug (electrical plug) and disconnect it.
2 - Trace the two wires from the oil tank to the engine, disconnect those two wires, then remove them and the oil tank.
3 - Mix the 50/1 oil in the proper amount with whatever quantity fuel you have. Disconnect the fuel line at the engine.
Pump the fuel primer bulb until fuel exits that hose with the tint of whatever oil you used. Reconnect the fuel hose.
That's it. If you want to test the heat warning system to ease your mind, have the key in the on position, then ground out the tan heat sensor wire that you'll find protruding from the cylinder head. The warning horn should sound off.
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