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Old 07-04-2012, 01:10 AM
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katsjp katsjp is offline
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Join Date: May 2012
Boat: 1994 MasterCraft ProStar 190
Location: St. John, IN
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'94 PS 190 - Not Accelerating at Top End

I have a 1994 ProStart 190 EFI. During the weekend I took the boat out and accelerated great out of the hole (has powerslot) and gets up to 28mph or 31 very well. However when I am cruising at 31mph and want to go to 36, I expect that it would instantly respond and jump to the speed immediately. Instead it gets to 34 and acts like that is everything it has, I then put the throttle down more and it actually slows down! Then when I pull the throttle back a touch, the boat will accelerate by 1 or 2mph tops.

I have a OJ 4 blade, but I should be able to do 36 or 38 or even 40 with no problem. i don't care about top speed, however I should be able to get to 36mph from 32 without a problem.

Thoughts? Suggestions? Didn't see a thread out there, but point me in the direction.
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Old 07-04-2012, 06:56 AM
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Boat: Prostar 190, 1994, 350 TBI 308hp.
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On the bottom of the fuel pump you will find ANOTHER screen inside. Pull the pump, clean this out, change your fuel filter at the same time and your top speed will return. I had the same problems about 2 years ago, thanks to Andre, this cured mine, hope it does for yours. I bet you find small amount of paper wadding inside - most likely cause is ethanol breaking down the fuel filter media.
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Old 07-04-2012, 10:37 AM
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h2oskifreak h2oskifreak is offline
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Boat: 1994 PS 190 TBI
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Don't forget there are 2 fuel filters on this model.
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Old 07-07-2012, 05:34 AM
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bret bret is offline
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Boat: Prostar 190, 1994, 350 TBI 308hp.
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Where is the second one, mine only has one and I've replaced the line all the back to the valve on the tank.
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1994 ProStar 190 Red/White, 350 Alan Tehan special
"PORSCHE, there is no substitute - except for my ProStar"
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Old 07-07-2012, 11:48 AM
wtrskr wtrskr is offline
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Boat: '94 prostar 190
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Do you have the corvette engine or the throttle body? Not sure of this, but I beleive the corvette engine has two but the tbi does not.
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  #6  
Old 07-09-2012, 10:49 AM
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katsjp katsjp is offline
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Boat: 1994 MasterCraft ProStar 190
Location: St. John, IN
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I just have the standard throttle body engine. I talked to my dealer and the suggested I pull the filter out and bring it to them to order the fuel filter to be sure I get the correct one.
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Old 07-09-2012, 03:33 PM
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André André is offline
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Boat: Prostar 190 1994
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Quote:
Originally Posted by katsjp View Post
I just have the standard throttle body engine. I talked to my dealer and the suggested I pull the filter out and bring it to them to order the fuel filter to be sure I get the correct one.
Did you check the screen at the inlet side of the pump under the brass barb fitting as Bret mentionned? Mine gets block with dog hairs and carpet fibers and other debris every 2 years .It's a 15 minutes job,very easy,no cost!!!ALWAYS be careful working with gas!!!
Unplug battery.
Close manual shut off valve on top of tank.
Remove electric connector from pump.
Remove hoses and tubing from pump.Use wrags or small container for whatever will drop.
Remove the brass fitting,inlet side.
Clean the screen.
Check that!
Take your filter to any car parts dealer for an instant replacement...
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Old 07-14-2012, 05:58 AM
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Boat: Prostar 190, 1994, 350 TBI 308hp.
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well...? Fixed or not?
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1994 ProStar 190 Red/White, 350 Alan Tehan special
"PORSCHE, there is no substitute - except for my ProStar"
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Old 07-10-2013, 03:36 PM
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katsjp katsjp is offline
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Boat: 1994 MasterCraft ProStar 190
Location: St. John, IN
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Was able to get to the bottom of it, ending up replacing the fuel filter and that did it. Also changed oil, checked the fuel tank, related screens, replaced spark plugs and is now running very strong!!
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