1957 Evinrude Fleetwin Carb Problem

[nwcove]

Re: 1957 Evinrude Fleetwin Carb Problem

I watched this tutorial and for the most part followed this tutorial exactly. http://m.youtube.com/watch?v=FtG4M7ye1N8

if you notice, in the first 3 seconds of that vid, it says for the 5.5hp motors. not that it wont work on the 7.5, its just the hard way to go about it!

 

[yesizmatt]

Re: 1957 Evinrude Fleetwin Carb Problem

Here are some pictures of the fuel pump and how I have it setup.

 

[nwcove]

Re: 1957 Evinrude Fleetwin Carb Problem

ok, you are not tapped into one of the bypass covers as shown in the pic i posted, but your pulse line is LONG . its quite important to keep that pulse line as short as possible. i would try a temporarily/permanently moving the pump to a closer location. and plz do relocate the line that runs between the spark plugs....in the event of an impeller failure, the head will get very hot, very quick!

 

[yesizmatt]

Re: 1957 Evinrude Fleetwin Carb Problem

could that be why it is not running very good? I also took out the high speed knob when the motor died, and only a tiny bit of fuel drained out from the carb bowl, way less than normal. Does this mean it is not getting enough gas when I twist the throttle to make it go faster?

 

[bonzoscott]

Re: 1957 Evinrude Fleetwin Carb Problem

Just a thought - I have an old plastic lawnmower tank an four foot of fuel line attached. I use it to rule out the pump by hooking the line directly to the carb and place the tank higher than the motor, gravity feed the carb. But sounds like it is your pump that is the problem.

 

[nwcove]

Re: 1957 Evinrude Fleetwin Carb Problem

jmo, but you need to get back to basics! a proper compression test first, then move onto a proper spark test. as mentioned, you can easily bypass the fuel pump and run the motor .

 

[HighTrim]

Re: 1957 Evinrude Fleetwin Carb Problem

I agree with above here, always follow the steps for troubleshooting.

It sure does sound like your motor is running out of fuel.

1. That pulse line is TOO long for a 7.5hp motor
2. Put the intake manifold back together as it was. Stick a 4" or so piece of fuel line on the barb coming off the intake manifold you have now running as your pulse line and block it with a bolt. Drill/tap the bypass cover, after removing it from the motor, install a barb and get your pulse from there. Now your pulse line will be very short, as it should be.
3. Run your IN line under the carb over to the pump.

At least you did not use epoxy to block one of the passages in the intake manifold. I see this method used frequently on here, seems to give a lot of issues, I do not like it. Have seen this MANY times on here over the years. Use the bypass cover for your pulse as nwcove did in his pics, and your issues will go away if all else is ok.

 

[yesizmatt]

Re: 1957 Evinrude Fleetwin Carb Problem

2. Put the intake manifold back together as it was. Stick a 4" or so piece of fuel line on the barb coming off the intake manifold you have now running as your pulse line and block it with a bolt. Drill/tap the bypass cover, after removing it from the motor, install a barb and get your pulse from there. Now your pulse line will be very short, as it should be.

So are you saying here that I have to block off the place the vacuum line went into from when it was hooked up to a pressure tank?

 

[HighTrim]

Re: 1957 Evinrude Fleetwin Carb Problem

Well, it was a pressure line, but yeah, the line you have now running to your pump pulse fitting, from underneath the carb. Cut that off and plug it. Undo what you did in the intake manifold. Put it all back to normal. Then where you have your pump mounted now, those 2 removable covers are called bypass covers. Take one of them off, don't matter which one, and install a barb in it, then run a line from that barb to your fuel pump pulse barb.

 

[oldboat1]

Re: 1957 Evinrude Fleetwin Carb Problem

How many holes have you drilled in that motor so far? With any luck, you haven’t done any drilling yet – have removed the pressure line, and in effect rerouted the hose. Also screwed a fuel pump up to a bypass cover, maybe using one of the existing holes from the cover to bolt up the pump. No drilling yet, maybe. If so, think it would be good to take a breath and figure out where you are. Not too late to go back to the pressure tank if things aren’t too jiggered up yet, even if temporarily -- know from earlier posts you had the motor running some earlier. Once you have done the normal checks and repairs you started before, you could to a fuel pump conversion on a working motor (potentially). Compression, spark, carb – some done, some not (compression?), some may need tweaking (carb). Just a thought.

 

[yesizmatt]

Re: 1957 Evinrude Fleetwin Carb Problem

Okay I have undone the mod to the intake manifold and installed a barb to the bypass cover. It is snug and doesn't seem to leak any air, and now it pumps way more fuel out when I turn the flywheel. When we tested it out, it starts first pull almost every time and idles down very good, but it will not go fast at all when the throttle turns. Do you know why this could be? Just the other day it could get high rpms, should I put back in the newer float and needle pin inside the carb? I also would like to add that I disconnected the gas tank, and then right before it ran out of gas it would speed up really fast (like it was suppose to because I had throttle on fast).

 

[HighTrim]

Re: 1957 Evinrude Fleetwin Carb Problem

They always do that just before running out of fuel.

What is the high speed needle set at? Ill assume you have tried setting the needles first?

 

[yesizmatt]

Re: 1957 Evinrude Fleetwin Carb Problem

Okay the motor has been running a bit better I took it out on the water and their is a small problem. The motor will go pretty slow maybe 1/4 the speed it should on full throttle, and the motor doesn't react to the high speed control. Then, it will start to speed up after a bit and run good. Something must be wrong with the high speed knob although it doesn't look like its bent or anything at the tip.