99 SN GT40 Hard-Won’t Start When Air Temp Cool

[bwylie]

99 SN GT-40 EFI that I have owned for about 3 years. In my neck of the woods, we are experiencing unusually cool mornings (low to mid 50’s). Boat has always started right away - but the last 2 mornings (53 & 57 degrees) it will start for about 2-3 seconds and then shut off. The fuel cell is cycling, engine cranks and it appears to start. Yesterday, after trying it 8-9 times, it finally stayed running, we went out, skied and it ran well. This morning, after several attempts, it started, stayed on for about 2 minutes and then stopped - and wouldn’t start. I let it sit for about 30 minutes, air warmed up some and it started after a couple of attempts and ran well (of course we lost the water we were after).

Any thoughts?

[NautiqueJeff]

I wonder if your fuel pump is starting to die. I'd check fuel pressure when the issue is happening and see what you've got.

[mpost]

Do you have a safety lanyard? Maybe it is acting up in the cooler/damper mornings??? here is a couple examples of it failing.
https://www.planetnautique.com/vb5/f...unning-problem

[bwylie]

Thanks for the thoughts - I’ll look into both. It got warmer in the mornings (60’s) so no problems starting the last 2 days.