Rich976usaf
Seaman
- Joined
- May 9, 2007
- Messages
- 61
Hey again guys. Im still having this problem. I just wanted some input before i go and buy a $$ expemsive fuel pump. I am restoring this 1985 evinrude 115 hp ob. I have rebuilt the lower unit, cleaned the carbs, water pump.
The problem im having is a cant get enough power to get up on plane. I idle fine and run about to 1/2 wot above that i bog down. But if i back off then i still run. I get small pulses of power sometimes. Or if i "hit it" it revs up nice then usually stalls. It might help some if i keep squeezing the primer bulb. I thought it was a problem with the tank, so i bought a new tank. I was getting goo from the tank in the filter. The problem still persists. I have changed all the fuel lines. Does this sound like a weak pump. I have pulled the VRO pump that I have converted to premix and closed off the oil lines. I ran it with the cover and air box off. I could see the fuel spraying into all four barrels. So how could it be the fuel pump. Am i not getting enough fuel, I cant tell? Could this problem be electrical?
Where is a cheap place to buy a fuel pump. Can i convert to a different style pump? What are my options. What do you guys think? Any advice is appretiated.
I pulled the pump and opened it up the diaphrams look good. there is a one way valve for the fuel in line built into the pump that works well. I checked it by blowing and sucking on the line. (mmm gas tasty) So then i checked the engine pressure part of the pump in the same mannor. I could pull air through it easily. but when there was pressure on that port i could blow through it with resistance. Like there is a leaky valve I cant see. Do you masters know if that is right or wrong.
I just dont want to buy a $200-250 pump if its not the problem.
The problem im having is a cant get enough power to get up on plane. I idle fine and run about to 1/2 wot above that i bog down. But if i back off then i still run. I get small pulses of power sometimes. Or if i "hit it" it revs up nice then usually stalls. It might help some if i keep squeezing the primer bulb. I thought it was a problem with the tank, so i bought a new tank. I was getting goo from the tank in the filter. The problem still persists. I have changed all the fuel lines. Does this sound like a weak pump. I have pulled the VRO pump that I have converted to premix and closed off the oil lines. I ran it with the cover and air box off. I could see the fuel spraying into all four barrels. So how could it be the fuel pump. Am i not getting enough fuel, I cant tell? Could this problem be electrical?
Where is a cheap place to buy a fuel pump. Can i convert to a different style pump? What are my options. What do you guys think? Any advice is appretiated.
I pulled the pump and opened it up the diaphrams look good. there is a one way valve for the fuel in line built into the pump that works well. I checked it by blowing and sucking on the line. (mmm gas tasty) So then i checked the engine pressure part of the pump in the same mannor. I could pull air through it easily. but when there was pressure on that port i could blow through it with resistance. Like there is a leaky valve I cant see. Do you masters know if that is right or wrong.
I just dont want to buy a $200-250 pump if its not the problem.
He said he changed part of the ignition that was holding back the rpm. He didnt know what it was. He siad it wasnt a coil or magneto. Is there like a computer or something that would restrict the rpm unless i open the primmer solenoid and flood the engine with gas. 