could this issue be the fuel pump

[sutor623]

Re: could this issue be the fuel pump

Yea if not message me your phone # and ill give you a heads up. Cdi troubleshooting can be daunting until you do it yourself. Once you do it, you'll never feel underqualified to find electrical issues in a 2 stroke motor.

 

[submariner1980]

Re: could this issue be the fuel pump

1. Put spark wire in a coil, inside the coil kinda screw so you need to rotate wire clockwise few revolution. Check end of the wire before yuo put it in. If its no metal wire exposed at the end cut 1/8 inch of insulation till metal exposes.
2. Start her on muffs if she idles good leave electronic alone.
3. Try on the big water you did before with WOT, when she starts die hit a choke for moment. I f she starts running repeat carbs cleaning all over

 

[sutor623]

Re: could this issue be the fuel pump

2. Start her on muffs if she idles good leave electronic alone.

What is this a joke? The motor draws way more current at higher Rpms and if the electrical system isn't producing it, it will not run properly at WOT. Plus running on muffs at idle will not always get the components hot enough to show their faults. Most on here agree that a motor that has dropped a cylinder, it will often "hide" while idling in the driveway, and reveal itself under load with a lack of power and/or a misfire.

 

[sutor623]

Re: could this issue be the fuel pump

And by the way, choking the motor will not alway reveal a fuel restriction, especially if the restriction is only on one cylinder. Actually many times it will bog the motor down to a halt.

 

[rpatton]

Re: could this issue be the fuel pump

Easy guys! Submariner to answer you questions she idles good while on muffs or at the dock trouble starts after im at wot for a minute or two and choke does not seem to make a change
Sutor if you think its an electric hot condition will it show testing at the dock or trailer. I was going to send a pm wwith my # but never did that on this site maybe you can help me there to. As you can tell i need a lot of help here. Thanks

 

[sutor623]

Re: could this issue be the fuel pump

For PM, click on my name in the top left of any post, and click send message. You have to duplicate the issue in order to spot it with the volt meter and DVA meter. You need to either make or buy a DVA meter to do an electrical system diagnosis. You may need to take it for a quick spin, and then keep it idling when you get back to the dock before you start running tests. Otherwise, rev her up to 1500-2000rpms while on muffs for 10 minutes or so until the problem starts to come up. Some boat docks will allow you to run the motor in gear while on the trailer for some tests. Just make sure its okay because it is frowned upon at many marinas. If it is not misfiring, you will more than likely not find the issue with your volt meter.

 

[rpatton]

Re: could this issue be the fuel pump

That kinda what i thought and no my marina will not allow. i do habe a good mechanical backround but am lost on electrical so what is a dva meter. I will send my # feel free to call if you want or not. Just trying not to throw parts atit

 

[rpatton]

Re: could this issue be the fuel pump

Sutor guess i cant send a pm from my phone since there is no send message button

 

[fireman57]

Re: could this issue be the fuel pump

It still sounds like an overheating problem to me. When it surges and shuts down do you still have a steady stream of water out of your telltale? Oops, i don't remember if that year had a telltale yet. If you have one feel how hot the water is coming out of it. You may have a restriction somewhere that allows it to be cool enough at idle but not WFO. You can also put your finger on the top of the heads when it does this, if you can't hold them on there for a fairly long count of 5 you are running hot.

 

[rpatton]

Re: could this issue be the fuel pump

Yes i do have a telltail i did the conversion. I also have a new pump. The water comilg out does get hot and steamy but seems to cool down when the t stat opens then i can keep my hand in it.

 

[fireman57]

Re: could this issue be the fuel pump

even after running at WFO and it messes up? It shouldn't really be steamy if it is working properly.

 

[rpatton]

Re: could this issue be the fuel pump

It seems to be pumping fine. I would not know where a blockage would be

 

[fireman57]

Re: could this issue be the fuel pump

It could be in one of your cooling passages or on the exhaust side of the engine. If you think that it might be too hot after you put your fingers under there after running it hard and it messing up then I would buy a new head gasket and take the old head off. It's not hard to do. Try to flush out all the water jackets around the cylinders, even take a stiff piece of wire and run it through them. If they are clear then you need to take the exhaust side off. Tougher job but do the same with the water jackets there. Anything small could have gotten sucked up in there. I have had to do this to two engines in the last two years and I am not a certified mech, just backyard, but so some work on the side for people I know. You can also use the finger test on the head when the problem happens. Easy check and free too.

 

[submariner1980]

Re: could this issue be the fuel pump

Next advise will be - replace lover unit

I have same Evi 70673D. Got her 1 year ago for free from old man with diagnosis from marine mechanic to replace stator, ignition unit and something else. PO told me.
Motor was sitting in barn many years.
I have replaced fuel lines, fuel pump diaphragm, lover unit seals, impeller and carb work. When got her on the water she did absolutely same. Remedy is carburetors cleaning. I did it more then 5 times.
Notice - I didn't replace stator or coils or spark plugs or ignition unit. Why? Coz I'm not a certified marine mechanic, just 40 years experience in electronics.
Good luck to all.

 

[rpatton]

Re: could this issue be the fuel pump

Thanks for your input submariner i was going to clean them again just for piece of mind along with checking electronics and temp. I still think it feels like fuel but my experinence is in diesels not these 2 strokes so im taking all the advice i can get and checking things so i just do not throw parts at it. Thanks again

 

[sutor623]

Re: could this issue be the fuel pump

He already did an entire fuel system overhaul. And these rude carbs are simple as there is no adjustment needed, there is no reason that one shouldn't be able to get it right the first time.

 

[sutor623]

Re: could this issue be the fuel pump

Sub he already did an entire fuel system overhaul. And these rude carbs are simple as there is no adjustment needed, there is no reason that one shouldn't be able to get it right the first time.

 

[rpatton]

Re: could this issue be the fuel pump

Sutor , i dont know maybe i missed something ?

 

[submariner1980]

Re: could this issue be the fuel pump

Long time sitting is the factor. In my case carbs were almost shiny. Just some gummed oil in bowls and green varnish on jets. I have used carbcleaner, acetone, seafoam, airblower, copper wire to remove green s**t. And finally took off all plugs to get all passages cleaned.
Would mention about one problem have discovered at this time. After replacing bowl gaskets she starts work slightly rough, on 2 cylinders.
I opened drain plugs on the front of carbs and in lower was no fuel. Primer bulb was hard like you have it. Was confused for more then week.
When carb in my hands float is working properly, after assembling fuel is in all 3 bowls, after few minutes run lower carb is dry
Reason was in bowl gasket. Gasket was slightly extended in to the bowl and retain float in upper position so needle restricted fuel flow. Gasket material is brown rubber/plastic extends if soaked in gas and shrinks if carb disassembled. Simple cut small piece of gasket and she is murrrrrrrrrrllllin :joyous:

 

[rpatton]

Re: could this issue be the fuel pump

Something to check. My list is getting longer. The puzzling thing to me is that it ran great for two and a half weekends right up and untill i parked itin its slip for the night. Next morning put two fresh fuel cells in and made it about 100 yds and thats when it started with the surging