Converting VRO Pump to Standard Fuel pump on 90HP Johnson

[Cady8special]

Morning guys,

I have a 1988 90HP Johnson with Disconnected VRO and Pre-mix. I've got a 1989 88 SPL that I use for parts, and I was going to install the 88 spl fuel pump on my 90 and get rid of that VRO system.

The VRO system has 4 ports - Gas in, Oil in, Pulse in, and Gas/Oil out. The pump for the 88 spl only uses 2 ports-- gas in and gas out. There is what looks to be another port on the back side of the pump though-- no nipple, just a hole. Is that where I would put the pulse if I made this conversion? Can I use this pump, or is there another style I would need to buy?

How does that fuel pump even work if there's no pulse on it? That's strange to me.

Any help would be greatly appreciated.

Thanks guys.

[Cady8special]

pulse.jpg

Here is the picture of what I think is a port on the back side. If anyone can confirm if this is the pulse port, that would be great.

[hidef]

The hole in the back is for the pulse port. I have included a link to maxrules where there is some good info on fuel pumps.

http://www.maxrules.com/fixomcvro.html

[Cady8special]

Thanks man- that's what I was hoping.

Any idea how I'm supposed to connect a hose to that port? Is it just a male/male nipple that goes in with just a friction fit?

[hidef]

On your 88 it just bolts on and seals with the gasket. You can buy a pump that has the pulse port down below and uses a hose just like the VRO pump. Check the maxrules site for the model number.