I have had the symptoms for two seasons and we thought we figured it out last season. But... based on yesterday... apparently not.
As I am looking for every angle, I'm just going to post what happened in hopes someone comes up with a new idea.....
Merc 470 on '79 Santiago. Full tank of fuel.
1. Head out from Coronet Bay... down south to Camano Island and then head back...
2. Cruising at 20-ish mph at 3000-3200 rpm... purrrrrrrrr
3. Get back up around Skagit Island, been out about 75 minutes cruising at this point and the engine dies.
4. It will idle, but any load (into gear) and it stalls.
... but wait there's more..
5. I light up my 2005 Honda 4, 15 HP Kicker... to head back...
6. After about 15-20 minutes of putting along nicely.... it dies.
7. I am able to start it, let it puch along for a minute, it dies, I restart... eventually... it doesn't want to start either.
8. It's been 20 minutes since I tried the main engine... so why not??? It starts right up.. purrs like a kitten.
9. At the pier I had to maneuver forward/reverse a few times and was worried it would stall at an inappropriate time... but it was just fine.
10. When I got home flushed both engines... they fired right up and ran fine. I use a bucket to flush the kicker so was able to put it into gear as well... all just fine..
To set the hive mind in the right direction... As the only thing the engines have in common is Gas... I checked both screens.
The in-line on the kicker and the fine mesh screen that is in the side of the carb on the 470. Both SPOTLESS....
I do have a water separator which I will pull next... but wanted to get the hive mind opinion.. The fact that BOTH engines, completely different (other than they are engines) acted essentially the same, the only common thread is the fuel... so I started with filters.. and came up empty...

Thanks in advance for any thoughts..
Miles
p.s. I just love these 60 degree and raining type days... (sarc) LOL !!!! Man was it nice out yesterday...
As I am looking for every angle, I'm just going to post what happened in hopes someone comes up with a new idea.....
Merc 470 on '79 Santiago. Full tank of fuel.
1. Head out from Coronet Bay... down south to Camano Island and then head back...
2. Cruising at 20-ish mph at 3000-3200 rpm... purrrrrrrrr
3. Get back up around Skagit Island, been out about 75 minutes cruising at this point and the engine dies.
4. It will idle, but any load (into gear) and it stalls.
... but wait there's more..
5. I light up my 2005 Honda 4, 15 HP Kicker... to head back...
6. After about 15-20 minutes of putting along nicely.... it dies.
7. I am able to start it, let it puch along for a minute, it dies, I restart... eventually... it doesn't want to start either.
8. It's been 20 minutes since I tried the main engine... so why not??? It starts right up.. purrs like a kitten.
9. At the pier I had to maneuver forward/reverse a few times and was worried it would stall at an inappropriate time... but it was just fine.
10. When I got home flushed both engines... they fired right up and ran fine. I use a bucket to flush the kicker so was able to put it into gear as well... all just fine..
To set the hive mind in the right direction... As the only thing the engines have in common is Gas... I checked both screens.
The in-line on the kicker and the fine mesh screen that is in the side of the carb on the 470. Both SPOTLESS....
I do have a water separator which I will pull next... but wanted to get the hive mind opinion.. The fact that BOTH engines, completely different (other than they are engines) acted essentially the same, the only common thread is the fuel... so I started with filters.. and came up empty...

Thanks in advance for any thoughts..
Miles
p.s. I just love these 60 degree and raining type days... (sarc) LOL !!!! Man was it nice out yesterday...
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