I have a 2000 40hp johnson,Im not getting oil and cant run it ,how can i fix this , I was thinking about just mixing gas and oil is this a good idea.

You will mess up the timing and foul plugs if you mix it. Just bring it in the shop. Probably somehting simple like a clogged filter.

Premix it 50:1, disconnect/unplug the connector (4 or 5 wire) going to the VRO pump, disconnect the two wire connector going to the oil tank and dump the oil out of the tank so the alarms won't sound. If you want, you can disconnect the oil line and cap/plug it off but thats' not necessary. If you don't dump the tank or disconnect the oil line, it will double oil until the tank is empty if the VRO pump is pumping.

Let it idle several minutes to give the premix gas time to get into the carbs and engine and you are good to go. The VRO nor the oil mixture has any affect on timing. When Johnson upgraded the VRO pumps in 99 they changed them from VRO to CRO (constant ratio oil, which is 50:1) so there is nothing about premixing 50:1 that's going to harm your motor.

Now, are you getting a no oil alarm or a low oil alarm. The No Oil is from the VRO pump, the low oil is the sensor in the tank. It's very common for the tank sensor to go bad and say the tank is low when it's full.

When you price a new VRO pump, wear a chine strap, that way you jaw won't hit the floor when they tell you.

It has been common practice around here for shops to get rid of J/E vro stuff from 1990 on to the end of OMC.  Many of the engines blew up because of no oil.  Guys just mix them and go on.

thanx for all your help everyone