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Old 06-23-2014, 11:03 AM
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sheyski sheyski is offline
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1994 LT-1 Loses Power Under Load - Sometimes

We have a 1994 Prostar 205 with LT-1 engine. Every so often, our boat decides to play games with us. It's been doing this for several years. It happened before we replaced our fuel pump 2 or 3 years ago, (which was also causing other issues) and it continues sporadically today. We can go weeks without an issue, then this problem will happen once, then we go for weeks with no issue again.

I will be idling in the water for a minute or two, waiting for the skier to get ready. I put the boat in gear, then they yell "go boat" and I push down on the throttle. It starts to take off for about a second, then cuts out like it went into limp mode - the power just cuts out. I can put it back into neutral, try again....same problem. So I either shut the motor off or leave it running and wait 30 seconds, try again and everything is fine. Once the skier is up, no issues with it running. It's only at take off. The boat ran just fine on Memorial day weekend for our show, so not sure why it pulled this on Saturday.

A few years ago, we found what looked like a large bug floating in our gas tank, so we dumped all the gas, removed the bug and things seem to work ok for quite some time.

I have had this problem pulling a pyramid off the dock (they are never happy when THAT happens...imagine 8 skiers/climbers all falling instantly). It happened once this weekend while pulling a sit skier and 2 side skiers. A few years ago, it happened while pulling a wakeboarder. He fell, I went back to pull him again and the boat wouldn't take off. It took a few attempts and finally I was able to take off.

Any tips to resolve this pesky little issue?

Thanks!
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Old 06-23-2014, 11:15 AM
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BTW...did you fix your cooling issues. I would put on new fuel filter, ( the one on the rail), check to see if you have an in line filter on top of tank and replace that, check for clog in primary fuel pump inlet screen. After that maybe run some sea foam in tank. Maybe check fuel pressure at rail. Basically I would eliminate it being a fuel issue and then move to spark issues.
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Old 06-23-2014, 11:20 AM
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Quote:
Originally Posted by mgs96ps View Post
BTW...did you fix your cooling issues. I would put on new fuel filter, ( the one on the rail), check to see if you have an in line filter on top of tank and replace that, check for clog in primary fuel pump inlet screen. After that maybe run some sea foam in tank. Maybe check fuel pressure at rail. Basically I would eliminate it being a fuel issue and then move to spark issues.
Cooling issue is something we will be working on this week. We brought the boat home after our clinic this weekend so we can work on trailer and boat. He's anxious to reroute the hoses according to Mastercraft fix, and see if that helps. We'll also look at the hoses to make sure none are collapsing from the inside.

How do we determine the fuel pressure? That is not something my hubs knows how to do.

What does "the rail" mean? "I would put on new fuel filter (the one on the rail)?"

Shey
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Old 06-23-2014, 11:21 AM
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My first guess would be the pump again. Do you have another inline filter at the gas tank, too? The first "filter" from the tank to the pump is the screen at bottom of pump. You might add an in-line filter at the tank and then pull the pump out and clean the intake screen.
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Old 06-23-2014, 11:28 AM
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Quote:
Originally Posted by sheyski View Post
Cooling issue is something we will be working on this week. We brought the boat home after our clinic this weekend so we can work on trailer and boat. He's anxious to reroute the hoses according to Mastercraft fix, and see if that helps. We'll also look at the hoses to make sure none are collapsing from the inside.

How do we determine the fuel pressure? That is not something my hubs knows how to do.

What does "the rail" mean? "I would put on new fuel filter (the one on the rail)?"

Shey
The "rail" filter is on the back of the engine area, just past your fuel pump. After the filter, it goes into the fuel rail on each side. There is a shrader cap where you could tie in a fuel pressure gauge.
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Old 06-23-2014, 11:30 AM
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Have u ever cleaned the fuel pump inlet screen?


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...A bad day water skiing still beats a good day at work...1995 Pro Star 205....
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Old 06-23-2014, 11:31 AM
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See picture.

Last edited by mgs96ps; 10-20-2014 at 12:58 AM.
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Old 06-23-2014, 11:36 AM
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Cool

Quote:
Originally Posted by Ski-me View Post
My first guess would be the pump again. Do you have another inline filter at the gas tank, too? The first "filter" from the tank to the pump is the screen at bottom of pump. You might add an in-line filter at the tank and then pull the pump out and clean the intake screen.
I know we have the first filter you mentioned. I'm not sure about an inline filter. Are you suggesting there might be a filter at the top of the tank on the same assembly?

Any pictures on this might be helpful so we can compare (if anyone has one).
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Old 06-23-2014, 11:37 AM
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sheyski sheyski is offline
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Quote:
Originally Posted by mikeg205 View Post
Have u ever cleaned the fuel pump inlet screen?
Probably not this year, but I think he did that in the past. I'll check and find out.
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1994 Prostar 205
http://www.TheWaterSkier.com
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Old 06-23-2014, 11:38 AM
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sheyski sheyski is offline
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Quote:
Originally Posted by mgs96ps View Post
See picture.
Thanks for the image! That is always helpful
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http://www.TheWaterSkier.com
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