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Converting 1985 VRO 140 to Pre-Mix

H

HBRon

New member
Good afternoon forum members. I own a 1985 Evinrude VRO 140 (l've been told it is a looper). After going through the engine, seems last problem is the VRO pump needs to be replaced. My thoughts are to just go to pre-mix. Can anyone point me in the right direction as to how to best make the change, and the best fuel pump to use? I read a couple threads elsewhere that suggested some of the fuel pumps out there do not supply enough fuel at the top end. Thanks to anyone who can help. Happy boating!
 
Another member will need to answer the question about changing to the proper and original small type fuel pump, however, the following may be of use to you.

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(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.

********************
 
joereeves said:
Another member will need to answer the question about changing to the proper and original small type fuel pump, however, the following may be of use to you.

********************
(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.

********************

Thanks Joe. Greatly appreciated! Great info.

Oops, I should have mentioned that the VRO Pump is leaking gas when charged, so needs to be rebuilt, or replaced. If I cannot fix it, I want to just remove it, and install a pure fuel pump. Would you know what I need to do this? Process?

Thanks Joe. Ron.
Click to expand...
 
Joe, all, I believe I found the solution.
1) Replace the VRO Fuel/Oil pump (5007423) with an EMP 1399-07359. This is for 90 degree Evinrude/Johnson VRO's 90 to 250 HP.
2) Remove the oil tank and lines (oil and 12V).
3) Add oil to fuel tank to get it to 50:1. Pump fuel lines clear of non-mixed gasoline until mixed is flowing through.
4) Test heat warning system.
 
HBRon said:
Joe, all, I believe I found the solution.
1) Replace the VRO Fuel/Oil pump (5007423) with an EMP 1399-07359. This is for 90 degree Evinrude/Johnson VRO's 90 to 250 HP.
2) Remove the oil tank and lines (oil and 12V).
3) Add oil to fuel tank to get it to 50:1. Pump fuel lines clear of non-mixed gasoline until mixed is flowing through.
4) Test heat warning system.
Click to expand...
Is your pump actually bad because if not just convert it to pre-mix and go. If you need a different pump get the one off of a 1980 v4 and use that.
 
All, I bought the EMP 1399-07359 fuel pump, removed the VRO, installed the EMP (three lines, In, Out, Pulse), added oil to my gas to spec. When I turn over the engine, NOTHING. I pumped the primer bulb between the tank and fuel pump until hard, and gas clearer seen in fuel filter chamber. Turned it over. NOTHING. I spoke to a mechanic I hired (prepaid, but not responsive). He said the fuel pump needs to be primed and that he would have to help me (I guess next freaking season or life). Anyhow, I digress, and vent. Does anyone know how to prime one of these fuel pumps?
 
No special procedure at all.----You operate the primer bulb on the hose to fill the carburetors.-----Turn key and push in the key while cranking.------Then roar down the lake.-----Fuel pump itself does NOT need to be primed.----Not sure where the mechanic came up with that statement !!
 
Thanks Joe and RacerOne.

Yeah, I know. I got suckered. There are only three hoses on the pump, Fuel In, Pulse, Fuel Out. There is no power to it. I think I have everything hooked up right. Does using starter fluid cause harm to the engine?
 
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