Re: 1993 50 HP 2 cyl Evinrude stalls, runs at idle when pumping gas
(You) - I have the VRO-pump, and have just ordered a standard fuel pump. There seems to be a fitting for this on the port side behind the starter. There is 3 threaded holes, the middle hole has a bolt with a gasket in it. I guess this is the pressure/vacuum source for the standard pump?
(Me) - Yes, that is the pressure/vaccum source for the regular fuel pump, as you suspect.
(You) - When I remove the VRO-pump, can I use this bolt to plug the pulse-line hole after removing the plastic fitting that is connected to the engine? Or should I leave the pulse line hose and plug it?
(Me) - Check to make sure that the threads are compatible first. Normally a brass fitting with a pipe thread is used to plug that VRO pressure/vaccum source hole. You could simply plug the line but it's best to install the fitting.
(You) - Also, when i plugged the oil side of the VRO-pump, I realised that it was water instead of oil. I pumped out about 0.5 litres of water before any oil came from the tank. I then removed the oiltank, and tried running on premix. The engine smokes a lot more, but sounds better with 2% oil instead of 2% water, but it still stalls after about half a minute on idle.
(Me) - That water problem entry into the oil tank has existed since day one back in 1984. You would think the engineers would have corrected it by now. One cannot leave that oil tank exposed to the elements without having rain or water spray enter it... and obviously to a great amount. Notice to all reading this.... Make sure that your oil tank is securely covered, out of the way of the elements (rain, spray, etc).... Keep the garden hose away from it when washing the rig down!
(You) - Question is, is it possible that water in the carburetors (from the oil tank) is causing the stall, instead of a faulty VRO-pump? Will the water be flushed out when running the engine, or do I need to drain the carburetors?
(Me) - Drain the carburetors to be on the safe side and pump a little fuel mixture thru them just to be sure that no water is lurking anywhere. It's unlikely that any water is there now BUT it's best to leave nothing to chance.
Your problem sounds like the VRO has been damaged by the water problem which is understandable and common, and you are on the right track to doing away with it.
I would add.... Check the compression to make sure that the water hasn't resulted in any internal damage such as piston scoring. Let us know what the PSI readings are on the individual cylinders.
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