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78 ski nautique issue

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    Posted: April-17-2017 at 8:55pm
I'm having a problem with my 78 ski nautique after it warms up. When I first put it in the water it's fine until 45 mins to an hr then it starts studderings. I can back off the throttle and it clears up but if I give it gas again it starts studding again. It acts almost like it's running out of fuel like maybe a vapor locking issue. I don't think my problem is vapor lock since it's not overheating or anything. If it was a carb issue it looks like to me it would be doing it even when it was cold since I have my choke unhooked. It's acts more like a fuel issue than a ignition issue since I can back off the throttle and it quits. Do any of you guys have an idea? Or give me an idea on where to start?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: April-17-2017 at 11:04pm
Check your anti siphon valve for debris.
T a pressure gauge into the fuel line between the pump and carb.
Loosen your fuel tank fill cap to make sure you are getting enough air into the tank.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: April-17-2017 at 11:16pm
Interesting article just ignore the voltage they are talking. I would check your voltage at your coil and check to see if you have a ballast resistor. Have you changed coils lately?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: April-17-2017 at 11:20pm
Check the items Pete suggested above. You want to find out if it's fuel or ignition causing the problem, could be either. Since you can smooth it out by throttling back, and assuming you can repeat the process, I'd lean toward fuel being the issue. You could have an older fuel line that is collapsing a bit under suction, the fuel gauge would indicate that.

While you are at it I'd pull spark plugs and see what they look like as well.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dustyb Quote  Post ReplyReply Direct Link To This Post Posted: April-18-2017 at 2:05pm
I'm thinking it's more of a fuel issue. I just put new plugs and wires on it, I'll install a fuel pressure gauge and see what it reads and go from there.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SN2001_1984 Quote  Post ReplyReply Direct Link To This Post Posted: April-18-2017 at 4:11pm
x2 on Pete's comment - had the same issue with my '84 and the 90 degree fitting/valve on the top of the tank were loaded full of junk.   Another trick is to run a line from the fuel pump to a 5 gallon container of gas and run it, see if eliminates the issue. that way you know its in the tank or the line or filter.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dustyb Quote  Post ReplyReply Direct Link To This Post Posted: April-18-2017 at 6:01pm
Well one thing that makes me think it's not the anti siphon is my fuel filter stays full of fuel. If the valve was stopped up I wouldn't be getting fuel to the filter. I pulled the filter out going into the carb and see trash in it. I'm going to clean it out and go from there.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: April-18-2017 at 6:50pm
Originally posted by dustyb dustyb wrote:

Well one thing that makes me think it's not the anti siphon is my fuel filter stays full of fuel. If the valve was stopped up I wouldn't be getting fuel to the filter. I pulled the filter out going into the carb and see trash in it. I'm going to clean it out and go from there.

Dusty,
I'd say the filter looks full because you aren't sucking air! Get that gauge installed. BTW, what filter are you talking about? Hopefully it's not one of those inline filters designed for outboards. Post a picture so we can check it out. We sure don't want you driving a bomb around the lake!!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote dustyb Quote  Post ReplyReply Direct Link To This Post Posted: April-18-2017 at 8:04pm
I forgot to mention I did check the fuel pressure and it was 5lbs and never changed even when it started spuddering.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PKB1023 Quote  Post ReplyReply Direct Link To This Post Posted: April-18-2017 at 8:37pm
I had the same problem with a car back in the late 70s. The condenser would act up after it got warm. Ran great when it was cool. Hope this helps.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dustyb Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 5:27pm
Ok I was wrong about the fuel pressure. It's good until I start giving it gas. At full throttle I have zero fuEl pressure and it dies but can let off and it'll pick back up. Haven't che ked the valve yet, I'm going to do that and if it's clear it must be the fuel pump
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 5:42pm
That's good news, means you've found the problem! If the anti-siphon valve ends up being ok, don't rule out a collapsing fuel line. Before replacing the fuel pump I'd run it on a short length of fuel line into a gas can like Denny (SN2001_1984) said above. That would tell you if your fuel pump is ok and it's the fuel line or valve causing the problem.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 7:44pm
Dusty,
Yes, it's good news you are narrowing down on the problem. I'm glad you got that gauge installed.

What about that filter. I wasn't joking about the ones designed for outboards.
Originally posted by 8122pbrainard 8122pbrainard wrote:

what filter are you talking about? Hopefully it's not one of those inline filters designed for outboards. Post a picture so we can check it out. We sure don't want you driving a bomb around the lake!!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote quinner Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 7:48pm
The anti siphon is pretty easy to get to and check, my 77' way back when had the same exact symptoms and it was a clogged anti siphon. Betting that will be your answer.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dustyb Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 8:50pm
It was the valve
Got it cleaned up and running good. I have a slight hesitation from dead stop to full throttle I'd like to get out. I adjusted the air screws on my carb using a vaccum gauge so it should be set pretty dang close on that part. What else should I check to get that hesitation out? As far as the filer it was just an automotive in line filter but I took it off when I put the gauge on, I'm going to just run a new line from the pump to the carb with no filter.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 9:10pm
Might be accelerator pumps. Look down the bores (not running) and see if they are squirting evenly.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dustyb Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 9:19pm
Yes they are squirting like they should. I adjusted the linkage on the accelerator pump where there was no play and it wasn't pressing down like it's supposed to be. Should the pump cam be in the number 1 or 2 hole? I tried both and seemed to be better in the 2nd hole
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bwinn Quote  Post ReplyReply Direct Link To This Post Posted: April-20-2017 at 9:30pm
Originally posted by dustyb dustyb wrote:

Yes they are squirting like they should. I tried both and seemed to be better in the 2nd hole
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