Hello, I recently did a complete rebuild (pistons, ring, bored cylinders .20 over, upper/lower bearings, voltage regulator/ primer/plugs/wires/impeller/new carb kits/thermostates/you name it I replaced it with new) on a 1987 OMC 140 HP outboard. I pulled the VRO pump and replaced with two new fuel pumps that are used on engines up to 115 hp. I teed off the pulse line to run both fuel pumps, teed off the fuel from the boat so each pump had a line going to it, then I ran both outlet lines from the pumps into a tee to consolodate to one line that runs to the large tee that feeds the carbs. The motor starts and idles beautifully, but will not get on plane or run high rpms without pushing in the primer button. Oh yeah, I also replaced all fuel lines from the tank to the carbs, new primer bulb, new fuel filters. I am assuming the issue has to be before the carbs as I rebuilt them, all jets are clean (soaked in Evinrude engine tuner for 24 hours and blown out with air, visually inspected), needles hold under pressure and floats are set in accordance with specs, plus the motor runs right when you push in the primer so I'm thinking it isn't the carbs. The only solution I can think is maybe the fuel pumps running in parallel aren't pushing enough fuel, do you think if I run them is series it would help. Any ideas or help would be greatly appreciated!!!!!!!!! Oh, yeah I know I have to mix my fuel now, since I pulled the VRO pump, it is currently 23:1 for break in, then I will go to 50:1 XD30 oil only. I pulled the VRO pump because I turned wrench at a marina for 3 years and 95% of the engines I rebuilt were because OMC's VRO pumps are overpriced garbage, same reason I had to rebuilt my new boats motor, got a good deal though, will mix gas till the day I die. Thank you again for any help!!!!!!!!!!!
|