1959 Evinrude Fastwin 18 converted to fuel pump- not working.

[06z400rider]

Here's a video of the boat on the water. I just installed new points, condensers, spark plug wires, spark plugs, carburetor kit, etc. Coils are good. Firing on both cylinders now, but having a fuel problem. It was flooding before the carb kit and wasn't firing properly before points and condensers. Now it runs GREAT as long as there is gas in the bowl. Just installed fuel pump and used a vaccuum line cap to plug one of the holes after removing check valve assembly. PO has installed 3/16" fuel line instead of 1/4". I know it's smaller, but is that enough to keep it from getting necessary volume? Fuel pump only pumps when it coughs. (video) It's a mikuni pump made for Briggs and Stratton, sold by Oregon. It has 3 ports: one says, "P", and the other two were arrows showing inlet and outlet. I hooked crankcase pressure line that used to pressure tank, to "P". (Pressure?) and fuel line from old pressure tank to inlet arrow, outlet arrow straight to carb. As you can see in the video, it only pumps when it misses or coughs. Can I use that old tank? I saw something said I had to drill something for the pressure line, but I just used the old one. Will that work? Help?!?!

 

[06z400rider]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

I think I may have found the issue by reading here. What is the bypass cover plate? Where is it? I just used the old pressure line fitting. I guess I need to plug it, drill and tap 1/8" fitting into bypass cover plate??? I don't know what that is, though. Thanks

 

[Arctic 33]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

Are you trying to use the old pressure tank with your motor?

 

[boobie]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

The covers are on the stbd side of the mtr. One for each cyl.

 

[Arctic 33]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

This pic should help you with by pass cover.

 

[kfa4303]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

Great old motor. Here's a link that can walk you through a fuel pump conversion.


http://www.youtube.com/watch?v=FtG4M7ye1N8&feature=related

http://www.sschapterpsa.com/ramblings/Converting_dual_fuel_line.htm

 

[06z400rider]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

Are you trying to use the old pressure tank with your motor?

I am. I also tried sticking the hose down in a 2 gallon gas can while out there. I need to get a single line can, huh?

 

[06z400rider]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

Thanks, guys! I know exactly what they are now. I have pulled them to inspect piston, rings, etc. I will jump on this tomorrow and expect to see great results. I'm close now, thanks to all the help. I am no outboard guy. Learning as I go. I'll get that removed, drilled, tapped and fitted tomorrow some time and post back with another vid. It should work well. Thanks again!

 

[HighTrim]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

You have some plumbing issues there that are working against one another.

When using a fuel pump, the pressure tank is no longer needed. You switch it out to a single line tank. You then change the fitting on the motor. Plug the pressure line from the motor. Tap the bypass cover and run that line to the pump. Fuel line goes from tank to fitting, fitting to pump, pump to carb.

 

[kodibass]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

If you removed the intake and plugged one of the channel holes with a vac cap, you should not need to do any other mods to run on a single line tank, just replace old fuel connector to a single line connector and use a new single hose style tank. tapping the bypass is a second method of getting the same outcome as you have already done.

 

[bbstacker1]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

From what I have seen looking at different version of converting to a single line setup, I would have to agree with kodibass, tapping the bypass would not be required as you have already supplied your pulse point. From watching your video, and this may just be me, but it seems to me that something is wrong with how your motor is running, seems like you should idle down quite a bit more and that cough should not be there. I am thinking your low speed adjustment may not be right and I am also thinking that your vacuum line plug might be leaking where you plugged one of the ports (pumping only when it coughs), I think I would pull it back apart and also put a little sealer around the vacuum plug, to make sure it is not leaking, and check the adjustment on the low speed side of the carb you should be somewhere around 1 1/2 turns out to start and adjust from there.

 

[HighTrim]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

I have done a bunch am much happier with the results when plumbing into the bypass cover. I would only suggest modifying the intake manifold on the 5.5s where there is no bypass cover to tap into.

 

[06z400rider]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

I just went ahead and tapped the bypass cover today and the engine runs perfect. The only issue now is there is still that slight cough at idle. The low speed needle is about 1 1/2 turns out and I adjusted it slightly both ways. Seems to run a little better when I back out further on it. Backing out is richening it, correct? I've yet to get it on the water for testing, but it seems right this time. I ran it probably 10 minutes in a trash can, and it was pumping fuel fine. I now have a MUCH stronger pulse than at the old intake 1/8" port. Thanks for the help guys! Will post back tomorrow with a vid on the water and expect much better performance. Here's a video from yesterday before it was moved to bypass cover. Top speed was 5-6 MPH

 

[HighTrim]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

Glad she is pumping now.

Turning the needle out, or CCW, is richening it as you thought. Some need more than 1.5 turns out, if the lean sneeze goes away at 2 turns out, so be it.

Did you replace the packing for the low speed needle? How many did you use?

 

[06z400rider]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

Glad she is pumping now.

Turning the needle out, or CCW, is richening it as you thought. Some need more than 1.5 turns out, if the lean sneeze goes away at 2 turns out, so be it.

Did you replace the packing for the low speed needle? How many did you use?

I didn't replace it. I didn't know where it went or know if it needed it.

 

[HighTrim]

Re: 1959 Evinrude Fastwin 18 converted to fuel pump- not working.

That is your problem.

Pull the needle and packing nut off and you will see a stack of packing washers. They are a fiborous type washer. You will need to pick it out with a very small slotted screw driver or dental pick. Be careful not to let any get into the carb. Then pull out the bushing, it is likely clear and hard to see, but it is in there. I use a drywall screw to pull them out. Replace the bushing, put 2 new packing washers in, then goes the washer. That should solve your air leak issue.