No Spark

[Fed]

Is it part #24 here's one off a 70.

 

[Allensr6]

The battery is brand new and stays on a battery tender. I took the carbs off and they looked completely fine and clean I know looks can be deceiving! Blew them out anyways with a air compressor. Soo I press the bulb and I hear the fuel going into the carbs. Remember I took the fuel line off of the carbs and crank the motor and had a constant stream big as a pencil. For some reason the fuel isn't leaving the carbs? I'm assuming this because after I crank it time after time the plugs look perfectly clean and dry as the picture I sent you.

 

[Allensr6]

Yep part 24.

 

[Fed]

After it has stopped on you undo the carburetor drain plugs and see if they have any fuel in them?
I'd try & catch the fuel from each one to compare them.

 

[Fed]

Part #24 won't be causing your problems but you should replace the hose so it doesn't suck in crap.
It goes from the motor to a nipple on the back of the air silencer.

 

[Allensr6]

Well after it wouldn't run for a while today when I pulled the carbs the bowls was full of fuel. Tomorrow when I get back too it I'm sure it'll run first try for a few seconds and the when it quits is that when u want me too drain the bowls? I wanted too ask this,,,I took the fuel line from the carb as I said earlier and crank the motor and there was a stream big as a pencil. Could it be that when those line are hooked back too the carbs that a weak fuel pump may not be doing its job when the pump has a load on it?

 

[Fed]

There's probably not much point if the bowls were full the last time it stopped on you or wouldn't start for you.

I need to ask are you 'new' to outboards in general and how often have you used this boat previously?

There's a little skill to start old tech carbie motors unlike a computer controlled fuel injected car that key starts in an instant.

Oh, also did you notice the mention of quickstart in the link I put up?

 

[Allensr6]

Yep I've read all u sent too me. Well I'm pretty good with small motors and such but not much experience with boat motors. I bought the boat last yr and have had it on the water prolly every other weekend since this past April. I also own a 20 bay liner ocean boat so I'm not new too boating. Although plumbing has nothing too do with it but I am a master plumber and work for myself so pretty good with figuring things out. I try to explain what's going on the best I can. I guess the main point is I'm getting fire, I'm getting fuel too the carbs, and I have completely dry spark plugs. Those are the 3 facts of all this I know. And every evening after sitting all night it will run for approx 30 seconds and quit. Then won't run again till the next day no matter what I do.

 

[Fed]

The only other thing I know nothing about is the quickstart system, not even sure if your motor has it.

Do you have a model number for the outboard?

Full carbies, proper spark, primer solenoid working and you at the wheel it should go.
But wait is does go once or twice a day but only for 30 seconds...?

When it does run does it sound normal or is it running roughly on the edge of cutting out?

 

[Allensr6]

When it does run it sounds normal and water is flowing through it. If there was a way I could send a video I would show you because I guarantee if I was too go crank it now after not messing with it all night it would run.

 

[Fed]

At this point I wouldn't hesitate to rebuild both carbies, removing every jet & orifice and a complete clean out.
Don't forget the idle air bleed.
Your call but that's what I'd do.

 

[Allensr6]

Sorry the site wouldn't load for me all weekend. I'm removing the vro pump this week and installing a regular fuel pump and mixing the oil and fuel myself. I will let you know how that turns out!

 

[lmuss53]

Just something else to look at, using a spark tester that lets you see a 7/16 gap test the spark as soon as it quits. You could have an intermittent issue with the CDI that is killing the spark after a few minutes.

Do you have a back up tank, or can you borrow one? I would want to run this motor on a completely seperate fuel tank and hose set up to eliminate your boat tank, vents and hoses.

Don't rush to pull the VRO off yet, when it is running for you pump the ball up and see if it continues to run, if it does then go ahead with your fuel pump swap, If it still quits it isn't the pump. If you have to swap the pump, look for the fuel pump for the same year 48SPL, that was the non-VRO model for that year.

Do you have the newer hoses that are able to stand up to the alcohol in today's gasoline? The new hoses are typically gray and are marked as ethanol safe. I have seen the the old black hoses deteriorate internally and find their way into carbs, even ones that have been recently cleaned. When you had the carbs off did you try to blow through the inlet port to see if you had free flow into the bowl?

Check your onboard tank for a mud daubber nest in the vent hole, it's that time of year and that would cause problems like you are expereincing. Try running the motor with the fuel cap off so you know the tank is vented.

 

[oldboat1]

long thread, and maybe covered -- but might try to rule out fuel contamination (water can be a culprit in permanent tanks, along with other contamination). Running briefly then shutting down can be a symptom (along with not restarting). Try running off a portable tank with fresh fuel, and see if the motor operates properly. If it's water, have to clear the carbs and fuel in the pump/lines/etc.