Last year we bought this Johnson and fixed it up. It was in quite good shape and has not been used much over the years. We installed new coils, rebuilt the carbs and put a new impeller in it. It truly runs like new, starts first pull every time. Still has original pressurized tank. We had the boat out a few times this year, ran great every time.
So my son and I wanted to install a fuel pump and get away from the pressurized tank, mainly to satisfy Mom/Wife. I followed this websites procedure. http://www.outboard-boat-motor-repai...on/default.htm
Got a Mukini fuel pump. Removed the flapper valve under the intake manifold and plugged one side using a vacuum hose cap. Bought a new 3 gallon tank. Bought a new fuel line, with squeeze ball. Installed everything.
The motor ran decent in the barrel, but seemed to struggle going from full throttle to idle and it stalled several times. Was hard to start. But we worked with it and we seemed to have it running decent, so we took it to the lake today. Very disappointing.
Engine would start after a few pulls and idled OK, at full throttle it seemed to have less power and seemed to be fuel starved and would stall after a minute or so, we would have to pump with the squeeze ball to keep the engine going. i.e. we were supplementing the new fuel pump. The tank was vented. We actually tried not venting to see if it helped, didn't seem to make a difference, I assume it should be vented.
We pulled the line from the inlet to the fuel pump off (coming from the new tank and purged any air to be sure. No help.
With the engine running we removed the hose that is supposed to provide the "pulse" to the fuel pump and it seemed to be doing that. I am stumped.
I have decided to order a new "screen filter" that is in the carb, it is the only thing else I can think of, maybe the fuel pump is a slightly lower pressure and the filter is too clogged for the pump even know it works fine for the pressurized tank???
You guys have any suggestions?
So my son and I wanted to install a fuel pump and get away from the pressurized tank, mainly to satisfy Mom/Wife. I followed this websites procedure. http://www.outboard-boat-motor-repai...on/default.htm
Got a Mukini fuel pump. Removed the flapper valve under the intake manifold and plugged one side using a vacuum hose cap. Bought a new 3 gallon tank. Bought a new fuel line, with squeeze ball. Installed everything.
The motor ran decent in the barrel, but seemed to struggle going from full throttle to idle and it stalled several times. Was hard to start. But we worked with it and we seemed to have it running decent, so we took it to the lake today. Very disappointing.
Engine would start after a few pulls and idled OK, at full throttle it seemed to have less power and seemed to be fuel starved and would stall after a minute or so, we would have to pump with the squeeze ball to keep the engine going. i.e. we were supplementing the new fuel pump. The tank was vented. We actually tried not venting to see if it helped, didn't seem to make a difference, I assume it should be vented.
We pulled the line from the inlet to the fuel pump off (coming from the new tank and purged any air to be sure. No help.
With the engine running we removed the hose that is supposed to provide the "pulse" to the fuel pump and it seemed to be doing that. I am stumped.
I have decided to order a new "screen filter" that is in the carb, it is the only thing else I can think of, maybe the fuel pump is a slightly lower pressure and the filter is too clogged for the pump even know it works fine for the pressurized tank???
You guys have any suggestions?