GT-40 won't start

also, boat is a '99 SAN with ~700hrs.

Is the 15A breaker for the pumps popped? Can you verify 12v at the pump lead with a multi tester?

Our boat has two leads on the battery. One large cable for the starter and a smaller one for other things. We had exactly the same problem and later came to realize that the smaller lead was not connected to the battery. Once reconnected, the pumps worked and everything ran fine. I have no idea if what I have is stock configuration..? But may be worth checking. Perhaps one of your leads came loose or disconnected all together.

boat started and ran fine in the driveway tonight...eventually. at first it just cranked and cranked. i heard the pumps running...but, i checked the FCC bowl again anyway...got a couple drips out and that was it. disconnected the feed line from LP pump to FCC, stuck it in a bucket, unplugged the HP pump, and jumped the STO to ground. no fuel coming out of the LP pump. the pump was running and sounded fine, but no fuel. disconnected the feed line from the tank, connected a small hose to the feed side and stuck that in a small can of gas. jumped again to ground and it pumped out my little can pretty quick. hooked the feed line from the tank back up, jumped it and it pumped fuel just fine. hooked everything back up and hooked up the water hose and hit the key...just cranked and cranked again. $%^^%$$$#!!!!!!! i was checking everything out with a flashlight (of course it was dark by then)...and realized i didn't reconnect the HP pump connector...fired right up and idled fine. now i'm relaxing with a tall glass of jameson and wondering why the LP pump lost it's prime...

Check the antisiphon valve on the tank? Is there gas in the tank?

The manual states that if you run out of gas you need to turn the key on/off several times to purge the air/prime the pump. Emptying the filter would be like running out of fuel.
Also does yours have an additional in-line fuel filter my '95 does yours may not.
You can see it in the pic below on the left side by the stringer.

MI-nick wrote: breaker not popped (unless you have to push unreasonably hard to reset it). 0V at the pump lead. the manual references a 20A breaker...but I only have 60, 15, and 12.5...is the 15 for the pumps??

The GT40 manual in the reference section was for the early GT40's without the FCC. The 20 amp breaker is now replaced with the 15 amp and it is for the fuel pumps.

I would also remove and clean the anti syphon valve.

Was it the anti-siphon valve?

well...similar thing happened again tonight. i pulled off the lift and was idling around waiting for a friend...just as i pulled back on the lift, the boat stalled out. i cranked it and it would start briefly and die...then not start at all. i bought a code reader due to my previous problems and did the KOEO test...code 11, no faults. disconnected the line from the LP pump to the FCC and jumped the STO...no fuel coming out. i did the same business where i disconnected the feed line and used a short line in a can of gas...which the LP pump quickly emptied when I jumped the STO to ground. it MAY have discharged a chunk of something like a 1/4" piece of leaf...maybe. i also changed the anti-siphon valve since I had a spare (old one seemed to be fine...ball moved freely). hooked the feed line back up to the tank and it would pull fuel from the tank. hooked everything back up and it started and ran fine for ~15 minutes (i had about 4 trouble free hours prior to this). what could cause this to happen??? i'm glad it's running fine again, but worried it will happen again.

75 animal wrote: To prime the FCC just turn the key a half dozen times or so. Leave the key on long enough so the low pressure pump has time to pump. Works for me!

i appreciate the effort...but this really has nothing to do with my problem. and to clarify, the LP pump should only run for a couple of seconds when the key is cycled from off to ignition. leaving the key on (ignition) has no effect for either pump.

Sorry but my input was to only aid the priming of the FCC. It was said that you would put fresh fuel in next time. I don't need to do rid as I prime the FCC in the way I described. Priming the FCC was the only point I was trying to make. Sorry for the confusion

i did try removing the fuel cap last time it happened and it did not help.

relays have been replaced.

i bought a new LP pump just in case...i want to try to induce the problem and then change pumps and see if the new pump will pull fuel from the tank.

i'm thinking the pump is going...it "should" be able to pull fuel from the tank even when dry.

debris is a possibility, but I'd like to avoid pulling the tank just because it would be a big hassle...i have been thinking about adding and in line filter from tank to LP pump...