Who knows about GT40 engines? |
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Posted: March-25-2013 at 12:02pm |
Hey guys, getting a checklist ready for the season of things to do. My '99 needs a little tuning. Last year I bought it with about 425 hours and I put about 15 +/- hours on it. I brought it to MacCallum's Boathouse for a little work. My buddy Jeff also did a little work to the engine. It got new plugs, wires, cap, rotor, fuel filter, impeller and steering cable. I also put some fuel injection cleaner in the tank. Every once in a while after skiing the course, the engine sounds like the RPMs are dropping too low after being put into gear. So much so it feels like it could stall but doesn't. I had the idle adjustment tuned by MacCallum's. Also sometimes after idling and then pulling a skier, it hestitates slightly. I read about a low pressure fuel pump part for about $160 that could be the issue. Is this something anyone else has heard of? Also, are there any fuel screens or parts that could be clogged? I'm hoping I can fix this minor issue myself. Thanks in advance for advice.
Thanks, Ken |
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M3Fan
Grand Poobah Joined: October-22-2005 Location: United States Status: Offline Points: 3185 |
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You want to find out if it's fuel pressure first. There is a great thread out there about checking fuel pressure for hesitations/lumpy idle issues- I believe Lewy2001 knows a ton as do a couple others. I'd purchase or borrow a high pressure fuel gauge and contact Lewy!
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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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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Thanks, Joel. I'll track down Lewy. The issue is minor and intermittent. I wonder how hard it is to chase. Other than that the engine is strong!
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Ken an old thread you may want to have a look through.
GT40 Fuel Supply Issues Joel hope I dont get the blame for this one.
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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Tim D
Grand Poobah Joined: August-23-2004 Location: United States Status: Offline Points: 2641 |
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The very first thing to check is to see if the short fuel line is cracked inside the fuel cell.
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Tim D
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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What does the short fuel line look like? Do I need to access where the fuel filter is for that? Thanks for all the info.
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Ken it is the hose from the high pressure pump to the outlet on top of FCC. The hose is known to crack and create fuel pressure problems. This is the FCC with the casing removed to access fuel filter. Have you changed the fuel filter inside if not order one and the hose and do at the same time.
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Thank you, Lewy. I found the same write-up on PN. Looks like this is a common issue with the GT40. Where do I get this exact hose? I truly appreciate your help. This will hopefully save my from towing it to my Nautique dealer!!
Gt-40 Check the black three inch fuel line connected to the low pressure fuel pump inside the fuel water seperator. Big failure item on these motors. I had mine fail last year. It is a cheap part that will render your boat useless. I was told correct craft should have recalled it but for whatever reason did not. |
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Yes, I have changed the fuel filter and that didn't help the hesitation issue. It sounds like it's starving for gas momentarily and then it kicks in.
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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That pump you see is actually the high pressure pump. Skidim sell the a Hose Kit for a couple of dollars but it is just ordinary fuel line that you could buy locally at any reputable auto shop. If you order from Skidim get a couple of the GT40 Relays to make the freight worth while. They are a common failure item also. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Thanks for all your help, Lewy. As soon as the weather warms up, I'll get those parts installed and let you know. Where is the fuel relay located on the engine? Looks like an easy install.
Ken |
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Ken, There are two relays (small back cubes) at the back of the engine next to the ECM (Computer) on the same metal plate as the three circuit breakers. I have a picture some where but cannot find it at the moment it must be in my old Photobucket account. About to go to bed will find it in the morning for you.
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Thank you, Lewy. Have a good night!
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Ken, the position of the relays in the below picture can easily be reversed as the wiring will fit to either relay.
The EEC relay supplies the power to activate the fuel pump relay when the ignition is turned on. The ECM (computer) supplies the earth to operate the fuel pump relay and start the pumps. A good diagnostic tool is listening for the initial fuel pump prime while turning the ignition switch on. The pumps will run for a few seconds to make sure this is adequate pressure to the fuel injection rail. You can easily tell which relay is the fuel pump relay by the green/yellow wire. This is the 12V supply to both fuel pumps. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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storm34
Grand Poobah Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Great info. I never took pics but its less daunting seeing what you're getting into.
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Wow, thanks, Lewy. That makes life so much easier. I'm going to see if N3 Boatworks stocks these parts. I see a nice 10% CCF discount applies. Will let you guys know how I make out.
Chris, this was what you were telling me about at Tim's last year. You guys both seem to think it's that small hose. Ken |
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storm34
Grand Poobah Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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For under $5.00 I would certainly start there! Throw in a filter to eliminate that piece as well.
Zach at N3 should be able to get you the parts. I got the hose from SkiDim last year and they knew what I was dealing with right away. |
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storm34
Grand Poobah Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Ps- how's busted up wheel doing since I saw ya at Tim's? Out of the boot yet?
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Nautique2001
Grand Poobah Joined: June-14-2004 Location: Massachusetts Status: Offline Points: 2832 |
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Chris, I just had ankle surgery, so I went from a boot to a cast. They put a hefty looking deck screw through my ankle bone to heal it. Lesson learned, stand up when you know you have no chance of making a buoy! Thanks for asking.
Just ordered the fuel hose and two relays from SKIDIM. I'm told that both relays are identical. Funny how they do two different things but they're the same. Got a new oil filter, just need to find out what oil the GT40 drinks. Lastly my winch strap that the Ramlin keeps putting holes in. Good to go for now. Will let you guys know how the fuel parts fix the momentary hesitation issue. Ken |
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whiz05403
Groupie Joined: January-21-2007 Location: Burlington VT Status: Offline Points: 48 |
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I think my GT40 relay just died. Cant locate relay, I have this same plate pictured but no two relays below. Where are my relays?? 1996 Sport Nautique GT40 |
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whiz05403
Groupie Joined: January-21-2007 Location: Burlington VT Status: Offline Points: 48 |
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OK, found them. Does anyone know the automotive equivalent so I can buy them locally?
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Any brand plus pin configurations are standardized. Just make sure you get one with a high amp contact rating. 20 or even some are higher. |
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whiz05403
Groupie Joined: January-21-2007 Location: Burlington VT Status: Offline Points: 48 |
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Just went out and bought two replacement relays, here are some automotive equivalents:
-BWD R4810 Advance Auto Parts $15.75 -Relays NAPA ECH AR174 -Hella 4RD 960 388-31. 1688314CI Unfortunately, the relays must not be the problem. Still no 2 second fuel pump noise with ignition turn on. Whats next? Fuel pump(s) I have replace the smaller pump a couple years ago, would be surprised if it broke already. Ideas? Thanks Mike |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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check for voltage at that fuel pump when you turn the key on
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whiz05403
Groupie Joined: January-21-2007 Location: Burlington VT Status: Offline Points: 48 |
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OK, will try that in the AM
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