Poor Man's GT40 Diagnosis

Bad gas results in No Start Condition as described here:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=36363&title=2000-pro-air-gt-40-not-running

Spreadsheet
https://docs.google.com/spreadsheets/d/17VemuIOaa9i8kEply-ZmFOSyjyzz8rd7B0WEuIT_6S0/edit?usp=sharing

Bad low pressure pump causes hot start immediate stall due to lack of pump prime.. Tougher to replace on V-drive Super Sport, but everything is in reach. I crawled into the adjacent storage area to make it easier on myself. Take a few pics when you do it so you can see how things go back together. Also...might want to buy the male end of the connector that comes with the replacement pump to splice into the circuit wires. I'm going to solder and heat shrink the wires.

Check your relays on back of motor. Sounds like your injectors aren't firing or not getting fuel.
If the relays don't fix the problem check to see if you have fuel pressure at the fuel rail.

Fixing Kill Switch Cures no start condition:
http://www.correctcraftfan.com/forum/forum_posts.asp?TID=36784&PID=476176񴐐

Updated Spreadsheet:
https://docs.google.com/spreadsheets/d/17VemuIOaa9i8kEply-ZmFOSyjyzz8rd7B0WEuIT_6S0/edit?usp=sharing

Thanks for the input Tim. I logged your 30 amp inline fuse fix in the spreadsheet under:

EDIT: Per Lewy's correction below
I have now added a new row to the spreadsheet and put the entry under:


Fused Line in Batt
Box for EEC Power


Updated spreadsheet:
https://docs.google.com/spreadsheets/d/17VemuIOaa9i8kEply-ZmFOSyjyzz8rd7B0WEuIT_6S0/edit?usp=sharing

Thanks Lewy,

I've heard of that retrofit before, but that was somehow the first time it's been documented on this thread.

I've corrected my post and the spreadsheet.

It was another relay issue. Apparently one of the "new" relays went bad.

Sorry, just getting back to my previous post. It turned out to be electrical. Replaced the distributor and spark plug wires. I still have a slight hesitation at 2k RPM, but it is running much better. Top end speed has gone down a few MPH too. Any ideas on remaining issues

New ignition switch solves mysterious starter engagement when shifting into neutral
On approach to dock.

Yes, spark advance was adjusted, which improved the performance. I am still left with a noticable hesistation and rough running at around 2k rpm. Cap and rotor were replaced. New spark plug wires too. Appreciate any thoughts on causes.

That's something I could do if people posted those cross referenced part numbers. I'd have to look at it closer, but I could either add a column to what I have, or maybe a new tab in the workbook, with a spreadsheet just for that.

Maybe pull one wire at a time at 2000 rpm to see if running changes at all. If you pull one and nothing changes that's a bad wire. Reply to EJNautique

If possible, please start a new thread to hash out the individual GT-40 issues. Include "GT-40" in the title of your new thread so people know to weigh in.

I'd like to keep this thread as a place to post the results and the links back to the full thread. Working out the individual problems here will ultimately make this thread too messy to read through.

Hi EJ - We have a '95 Nautique GT40 that experienced similar problems last summer.   Did you resolve your issues ?   Our boat starts and runs great under most conditions but we regularly see hesitation, missing, rough idle on hot days. We could pull a few skiers just fine but by the 3rd or 4th skier (or if the boat sat at dock for an hour after use) then we would regularly experience rough idle,missing and hesitation during the hole shot.

Any thoughts ?

Tim is correct, '95 Correct Crafts did not have a FCC. In talking to a PCM rep I was under the assumption that the low pressure pumps were added to help cure the problem as he was telling me how hard it was installing them. I wonder if there was a recall to add them to early boats? My low pressure pump does not have a plug but instead is hard wired with shrink wrap crimp fittings. Knock on wood I have never experienced it. I wonder with the larger engine compartment and venting that a V Drive does not have the same trouble?