Converting VRO Pump to Standard Fuel pump on 90HP Johnson
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.