1950's Evinrude 15HP "Lighting Power"

[wiseguy55]

Re: 1950's Evinrude 15HP "Lighting Power"

Hold on a minute, here, everyone. The OP said that the engine would continue to run as long as he squeezed the bulb on that strange tank. That would seem to indicate to me that his carb is at least functional.

The problem here seems to be fuel delivery, clearly.

While that external fuel pump is a wierd setup, to be sure, if the engine is delivering both in and out pulses, it ought to work. And...if it is doing that, the old two-line tank wouldn't work.

What I'd do here is disconnect the pressure line at the fuel pump, and keep the fuel line connected. Pump the bulb to deliver a float bowl of fuel to the engine, then run it. At the tank end of the pressure hose, check to see what pulses are arriving. A flap of paper should be enough to tell if both pulses are there. If they are, then it's time to look at the pump. If only the positive pulse is there, then the thing's not set up right at the engine.

I suspect that the previous owner was trying this system out, found it did not work, and sold the engine. I'm betting that the old pressure tank isn't holding pressure any longer and needs to be rebuilt.

OTOH, the OP could alter the engine to send both pulses and use this oddball setup OK, if it's only sending pressure pulses and not the suction pulses.

Odd dilemma, but I sure don't want the OP to rebuild the carburetor, then still find the thing not working. A little more investigation is in order.

Great suggestion CATransplant! I think this is the first step that I should do to determine which fuel tank is the engine setup for. I can almost bet that your suspections of the previous owner are correct, and indeed might only need to rebuild the tank. I'll check for the pulses as you advised when I get home later today.

 

[tallcar]

Re: 1950's Evinrude 15HP "Lighting Power"

I have the exact same model motor, unless converted to use fuel pump, you must use pressure tanks. There has been many discussions about those pressure tanks. When functioning properly they are extremely tough to beat.

If you wish to rebuild that pressure tank, it is a simple process, parts are available from this location.:

http://www.vintageoutboard.com/

Look for this link Johnson/Evinrude parts then fuel system repair parts.

I have ordered the same kit from them on more than one occassion as I have 6 of those tanks.

Also if I may add, while you are rebuilding that tanks pressure system might as well have the tank itself blasted and repainted. Local shop should not charge more than $25 to blast it and you can prime and paint yourself. Well worth the effort.

Regards

Richard

 

[wiseguy55]

Re: 1950's Evinrude 15HP "Whispering Power"

Re: 1950's Evinrude 15HP "Whispering Power"

I have ordered both the carb kit and tank kit from www.vintageoutboard.com I was also planning on repainting the tank.

Question: Does anyone have the repair manual or parts manual for this motor in a .pdf file they can email me? Would appreciate it.

 

[wbeaton]

Re: 1950's Evinrude 15HP "Whispering Power"

Re: 1950's Evinrude 15HP "Whispering Power"

I have the parts manual on pdf. Shoot me your email address in a PM.

I don't have the service manual in soft copy. You can get it online at kencook, eBay or from an ad on the AOMCI website.

 

[wiseguy55]

Re: 1950's Evinrude 15HP "Lighting Power"

Ok, I finally got around to rebuilding the pressure tank. The problem still remains, it seems like it ran for longer than a minute before accelerating itself and then shutting off on it's own. So, my next step it to rebuild the carb, right? I had already ordered the carb rebuild kit from vintageoutboard.com when I ordered the tank kit just in case.

 

[Chinewalker]

Re: 1950's Evinrude 15HP "Lighting Power"

Did you determine that the pressure feed line is indeed feeding pressure and not pulsing? As asked earlier, with the in-line pump that was used previously, the flapper valve that makes the pressure feed one way may have been removed to make it a two-way (as needed for a fuel pump). If you don't have that flapper valve, then the pressure tank will not work. The flapper valve is located under the intake manifold behind the carburetor.
- Scott

 

[wiseguy55]

Re: 1950's Evinrude 15HP "Lighting Power"

I will take a closer look today and find out. I was looking at the parts list for the carb and part #15 is the "Air Line Check Valve" is this the one your talking about?