GT40 crank, no start, crank again and it fires

Trying to gather info before the boat comes out of storage. Found a number of threads with no start issues, but this boat always ends up starting.

1995 Supra Comp TS6M with the tubular intake GT40 and no FCC. Many times when attempting to start the boat, it will crank and not fire. Try a second time and it's about 50/50 on starting. Try a third and it always starts. Once started it will run great all day. Shut it off and same starting issue appears.

Things to check from other threads:
- Fuel rail pressure - every time I've checked was when the issue had already presented itself, and then it started on the next crank. No good data at this point, will have to check again during the first start attempt.
- Replace relays
- Check/clean electrical connectors on engine harness
- Check ignition switch connections

Any other thoughts?

Thanks for the advice!!

It took a while to get around to testing things out, but definitely wanted to share my findings. I probably would have been in more of a hurry if my Protec system had been failing.

Dreaming wrote: Hi Andrew,    it sounds to me like your Anti siphon valve might have a leak, or that you are getting air in your fuel system.   I would try cleaning the antisiphon, checking to make sure that your tank vent is clear, and replacing the fuel filter.    to me it sounds like your pumps are working, but it takes a couple of tries to fill the fuel rail.   I may be totally off base, but they would be easy tune up items to eliminate before you dive into bigger and better things.     Thanks for the post on Protec, Glad my old gear had a useful afterlife it would be great to have an option for using TBI for anyone who hasn't replaced the system yet.

That's the pump,sure beats the 200+ the others want

Once you confirm that the LPP fixed everything, I 'll post this one up on the GT-40 diagnosis thread and spreadsheet.

This one

https://www.summitracing.com/parts/crt-p4389

2001Sunsport wrote: Just a heads up, I have a 1995 with no FCC. People more knowledgeable than I can confirm if FCC equipped boats use a different low pressure pump. Hopefully the weather will improve here and I can report back if the boat is 100% fixed shortly.

They aren’t that knowledgeable then.
Same low pressure pump, different high pressure pump.
https://www.skidim.com/Electrical/products/1057/

So the latest symptoms are still the need to make the fuel pump prime 3-4 times before it starts, but also sometimes when launching a skier it feels like it falls on its face and other times it will rip their arms off.

I'm leaning toward replacing the high pressure pump shortly, but wanted to ask if anyone thought a anti-siphon could cause the power differences in addition to the starting trouble.

New high pressure pump showing up today...fingers crossed. I'll update with results.

gun-driver wrote: I’m guessing you went with this one, and are plugging the crossover line. https://www.summitracing.com/parts/crt-p61171

Yes sir, and one of these adapters. https://www.summitracing.com/parts/fra-491956

Saw some older posts on here that said it seemed to work well.

Every once in a while, maybe once in 25 starts my factory stock GT40 will fail to start promptly. With these engines there should be no cranking, just turn the key and they fire.
When mine does not fire immediately as it should I quickly turn the key to the off position then back to the run position and wait till I hear the fuel pumps pressurize before turning to start. Has worked each time for my boat. I think sometimes I rush to start before it has fuel pressure causing this condition.