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At Wit’s End with GT-40 |
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1998Nautique 
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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 Topic: At Wit’s End with GT-40Posted: May-28-2007 at 4:00pm |
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My GT-40 EFI. is still giving me grief. Here is a list of what I have done. New plugs and wires, cap and rotor, 2 new relays. New Fuel water seperator filter. Cleaned all the screens on the fuel system. Used fuel injector cleaner. Any ideas from anyone. I'm getting ready to maybe sell it. Fuel pressure is a bit low. Should I change the low or high pressure pump? Any help is appreciate.
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GottaSki
Grand Poobah 
Joined: April-21-2005 Location: NE CT Status: Offline Points: 3365 |
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Posted: May-28-2007 at 4:22pm |
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any symptom beside grief?
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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1998Nautique
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Posted: May-28-2007 at 4:33pm |
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Sorry, the boat hesitates infrequently. Usually it happens when accelerating, or running close to wide out. Its very unpredictable when it will happen.
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bbrech1
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Joined: November-11-2005 Status: Offline Points: 32 |
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Posted: May-28-2007 at 9:36pm |
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Are you on the origional tank of gas from when it was winterized?
Brad |
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1998Nautique
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Posted: May-28-2007 at 9:43pm |
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It did it all last season also. I may try changing the low pressure pump. Will this help?
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advsouthwind
Groupie 
Joined: April-27-2006 Location: United States Status: Offline Points: 82 |
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Posted: May-28-2007 at 10:16pm |
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Before spending anymore money try to break it down to fuel or ignition. See if you can get your hand on a fuel pressure guage then get the specs from cc.Go run with the guage attached and watch your pressures.If everything seems ok on the fuel delivery side then jump on the ignition side of the system. Do your diagnostic tree as recommended in the cc service manual and try to pinpiont. Your may need a good DVOM or lab scope or find a good mechanic that is knowledgable in fuel injection.You will probably find it is something pretty minor.Fuel injection is a nice system after it is understood. Good Luck
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gave up sea ray life for a 77 southwind 20 project just livin the dream
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M3Fan
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Joined: October-22-2005 Location: United States Status: Offline Points: 3185 |
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Posted: May-28-2007 at 10:21pm |
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The engine is fed from the high pressure pump which feeds from the pint or so of gas in the FCC, which in turn is fed by the low pressure pump. Could it be the low pressure pump not keeping up in filling that FCC cannister? For a hundred bucks, you should have a spare LP pump anyway. Very common failure point.
Where in the fuel system are you seeing your low fuel pressure? |
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2000 SN GT40 w/99 Graphics/Gel
2016 SN 200 OB 5.3L DI https://forum.fifteenoff.com |
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1998Nautique
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Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Posted: May-28-2007 at 10:21pm |
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Fuel pressure is about 5 psi low.
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79nautique
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Posted: May-29-2007 at 8:44am |
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clean the vent/check ball on the gas tank.
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boat dr
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Joined: June-27-2004 Location: United States Status: Offline Points: 4245 |
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Posted: May-29-2007 at 8:57am |
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Chris , don't tell him that,too easy. How many times do we fail proper trouble shooting ,after all else and we have run out of parts.
Vent only a couple of times,that anti-siphon vave[check valve] has gotten me several times,ruined a day and cost me a lot of greif............boat dr |
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1998Nautique
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Posted: May-29-2007 at 9:05am |
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Where is the check valve located?
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boat dr
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Posted: May-29-2007 at 9:18am |
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98, it is located at the fuel pick-up tube. That is the pipe that is inserted downward into your tank. there should be a 90 elbow then the anti-siphon[check valve]. they are some times S/S but most are alum,it will look like a hose barb fitting.
Remove the rubber hose unsrew the A/S and look for debris on the back side........boat dr |
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todicus
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Joined: July-10-2006 Location: Napa, Ca Status: Offline Points: 493 |
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Posted: May-30-2007 at 12:19am |
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I feel your pain..... New coil ( dealer recommendation ) on mine after all the other possible replacement parts possible to cure the exact same issue. Taking it out this weekend to see if it has been cured.
If not, then tank pick-up and fuel pumps are next.... I refuse to give up. When the boat is running good, nothing can touch it. Like a dang Ferrarri on the water. 
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1998Nautique
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Posted: May-30-2007 at 10:05pm |
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where does the coil go?
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1998Nautique
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Posted: May-30-2007 at 10:36pm |
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Anyone have a part number from Ski Dim.
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todicus
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Posted: May-31-2007 at 11:56am |
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SkiDim part No. R0117008 PCM Coil
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