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Old 07-15-2010, 10:18 PM
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loeweb loeweb is offline
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Join Date: Sep 2004
Boat: 1988 Prostar 190
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I need closure

and help
Currently I am having some fuel delivery system issues and am awaiting a water separator filter and a fuel filter from SKIDIM.
While doing endless searches on here I have noticed one thing staring me right in the face. When someone with similar symptoms starts a thread looking for answers, the answer is given several times throughout the thread by several people way smarter than me, but the solution for each problem is never ever given by the person that started the thread. Meaning that the people with problems are the only ones who know what worked for them not passing it on to the rest of us.

Here is my problem:
When pulling a skier or just cruising above 32 MPH for more than 30-45 seconds the boat cuts out and its almost like the throttle is pulled back to neutral. It has gotten progressively worse as of late, and has even died a couple of times if the throttle isn't played with accordingly. it always starts right back up and again runs fine below 3200rpms or so. I have it narrowed down to someplace behind the drivers seat, and suspect it is
1. bad fuel pump not keeping up with increased fuel demands
2. bad gas that has plugged up the water separator filter
3. clogged tank pickup/ check valve
4. something over my head in the carbereutor

Thanks to all in advance, and I promise I will complete this thread by giving the solution or solutions when it is found and solved.

So I guess what I am asking for is anyone that has had similar problems or exact problems chime in and help a guy out.
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Old 07-16-2010, 12:39 AM
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oldairboater oldairboater is offline
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Boat: Mastercraft, Prostar, 1992, 351 Ford
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Year? Carb or FI? Which carb if carbed. Only happens when pulling a skier? Does it happen at wot? What have you done so far besides order parts? I have been working on boats over forty years. Seen lots of different problems and learned how to isolate problems. The more information you post the easier it is to help. There are so wise people that frequent this site with MC specific information.

Last edited by oldairboater; 07-16-2010 at 12:43 AM.
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Old 07-16-2010, 03:18 PM
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loeweb loeweb is offline
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Boat: 1988 Prostar 190
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SORRY. 1988 190 with 351 4160 carb. It happens at WOT as well as with a skier. So far I have changed plug wires checked plugs (all appear to be good) changed cap and rotor this season. That is pretty much it.
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Old 07-16-2010, 03:41 PM
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Kyle Kyle is offline
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Replace the water separater, and check quality of the fuel in the tank. I doubt it is the pick up in the tank that would be clogged. You also have a manual fuel pump. It may have a bad diaphram in it or the spring is worn out.
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Old 07-16-2010, 04:01 PM
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Luv2Ski Luv2Ski is offline
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Boat: 1988, ProStar 190, 351w
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If your water separator was in the condition mine was when I purchased the boat, plan to remove it and give it a really good cleaning. There are steel parts in it that rust when the water builds up and make a big mess plus clog the filter fast. Don't forget to replace the second filter that is in the fuel pump itself, in my case both were filthy from all the rust particles. Finally, take a look at the screen that is at the fuel inlet of the carb.

If the problem persists after all that, it might be worth putting a fuel pressure gauge inline for diagnostics.

If you suspect a restricted fuel line, you can also bypass all of the downstream fuel lines by running a temporary line directly from the pump to a fuel can and take a couple of runs.

Last edited by Luv2Ski; 07-16-2010 at 04:04 PM.
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  #6  
Old 07-16-2010, 06:10 PM
LakeLemon
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Similar Problem

I am having similar problems with my 1997 ProStar 190. I have throttle body fuel injectors. We were out sking and lost power at high RPM's (above 2500). I replaced the fuel filter, just because it was the cheapest and easiest on my list of possible problems. Didn't help. Now I can barely get above an idle. The recommendations I am getting from these threads is to clean my water separator. Any other thoughts?
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Old 07-16-2010, 08:19 PM
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loeweb loeweb is offline
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how hard is it to ckeck the fuel perssure after the pump. Metal line makes it difficult doesn't it? Thanks to all so far.
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Old 07-16-2010, 10:02 PM
Nvrgvup Nvrgvup is offline
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I would say it is a fuel issue. Engine is starving. Had a snow blower that did the same thing. Ended up being crap in the carb float seat restricting fuel into the carb. Replace or clean all the filters and water separator then move into the pump, carb or injectors. Fuel pressure gage is a good idea.

Hey the way I look at it is when you finally figure it out you will have learned a little more about your boat and the next time trouble springs up.

The previous owner on my boat removed the water separator. I have it. Don't know if I should put it back on. Where does it go?
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Old 07-16-2010, 10:06 PM
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I had a similar problem with my 87 190, the carb needed rebuilt. I would think around 32 is when the four barrel starts to open and the problem may lay there.
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Old 07-16-2010, 10:20 PM
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oldairboater oldairboater is offline
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I wonder if you went in the wrong direction first changing plugs, cap and rotor. Never hurts to tune up a boat but that might not have been your problem. Remember you are working with gas. I can not stress enough that anytime you work with or around the fuel system--fire and explosion are a real threat. Start at the fuel. Pull a sample down stream from the fuel tank through the fuel system. Replace the fuel/water filter. Look at it the old one. Make sure your carb doesn't have stone filters or screens at the bowls. I don't know if that Holley does or not. You can hook a gas line past the fuel pump and turn the engine over and look at the stroke volume but that is a subjective non-scientific measurement. Several things could fail with mechanical fuels pumps but in my past either they pumped gas or not while leaking gas or not leaking gas. Not knowing the difference between auto and marine--in the past if the diaphragm was bad they leaked gas through the weep hole while they still pumped gas everywhere. Base gasket good? Next on the list would be the carb. It is a Holley and they sometimes need a professional to rebuild. If I was getting good fuel to that carb and I suspect you are then I would really be looking at your carb. I suspect your secondaries or secondary needle valve and float. Just a shade tree educated guess. If that boat runs good below 3200 rpm and around 32 mph but runs like crap past that sound like fuel starvation.
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