Need assistance. 1984 Evinrude 90 VRO V4

[1987sylvanoffshore]

Model e90mlcr
Seria# 0445840
I’m purchasing a boat with twin 90’s. One motor is missing the VRO pump completely and the other motor is complete. I would ultimately like to bypass both VRO pumps and mix my gas and oil. Can I buy the “cheap” Amazon VRO pump and just not hook up the electronics so the fuel still goes through? I’ve also seen the Amazon VRO delete pumps and can’t wrap my head around exactly what I need. I think I’ve also seen people do 2 fuels pumps per motor instead of 1 fuel pump and 1 VRO. Thanks In advance Im hopeful an Evinrude guru will get me going in the correct direction to order the correct parts.

 

[wayno01]

I wouldn’t order a cheap pump. If you don’t mind pre mixing max rules sells a good pump and won’t cost near what a good VRO pump would cost.

 

[racerone]

There is a spot on the intake manifold near the starter motor. .----You put the 1983 model fuel pump there.----It mounts directly over the pulse port ( remove the plug first ) with a gasket and 2 screws ( 10-24 thread ) , then re-arrange hoses.----Plug VRO pulse port.

 

[1987sylvanoffshore]

Ok boat is finally in my possession now from purchasing it. If there are no wires on the bottom of the VRO pump it’s already the mix gas/oil in the fuel tank pump right? I’m trying to see what I need to do to match the port side engine with the starboard side engine. Thanks

 

[James R]

I hope this will clarify for you. I replace VRO with the standard type fuel pumps for 50:1 regularly. Purchase a suitable pump the 83 model mentioned will do the job and should come with the gasket. No Chinese rubbish please. The mounting is by the starter motor and the port is plugged with a screw and seal. The mounting screws needed are #20 stainless. Remove the VRO and the connector in the crankcase which feeds impulse power to the VRO. The hose to the plastic manifold will probably be fastened with a plastic tie. Cut the tie with diagonal cutters. Great care is needed in removing the hose from the plastic manifold. If necessary use a sharp knife along the hose too free it. Care should be taken to avoid cutting into the manifold. You will need a 1/8 NPT brass plug and some fuel resistant sealant for the threads, to plug the pulse line hole in the crank case where the connector came from. Do not use PTFE tape. Big no no.
The output from the new pump will need to be connected to the plastic manifold in place of the feed from the VRO. You may need to disconnect the manifold completely and turn it upside down. Your choice. Try to use a formed piece of fuel line in preference to a straight piece. The straight line will fold in time and cut off the fuel supply. Connect the fuel input line to the fuel pump.
I recommend hose clamps for the fuel pump connections and a marine tie for the plastic manifold connection.
The use of WD40 on the hose ends will greatly assist in assembly
When complete pump the primer bulb to check for leaks.

 

[racerone]

Well---10-24 screws would fit better.