Are the fuel tanks connected?

S

Skicoop2

Member
Nov 19, 2021
62
Boat Info
310 Sundancer 2001
Engines
5.7 Mercruiser 350 mpi v-drive
2001 310 Sundancer are the fuel tanks connected or is each tank dedicated to one engine(ie: port tank port engine, starboard tank to starboard engine?)

Thanks
 
We did a 10 hour cruise and the engines ran great. When I put them in idle once docked starboard stalled. Now it cranks but won't even try to start. Any thoughts?
 
Try starting it with the throttle advanced (search "idle air controller" "IAC"). The issue is most likely electrical since if it was fuel related, there will usually be some "stumbling", at the least. It could be something else (needs more investigative work), but the IAC is a high likelihood option.
 
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Do you have fuel switches? Previous owner may have left them set incorrectly. You will see something like "Port" "Starboard" "Both" . This happened to me on the 2001 Regal 3780, took me a while to figure it out because the previous owner used a sharpie over the words and got it backwards.
 
Lazy Daze said:
Try starting it with the throttle advanced (search "idle air controller" "IAC"). The issue is most likely electrical since if it was fuel related, there will usually be some "stumbling", at the least. It could be something else (needs more investigative work), but the IAC is a high likelihood option.[/QUOTE

The fuel pump isn't turning on with ignition. Is there a fuse or circuit breaker for the fuel pump? Could it be the relay?
Click to expand...
 
+1 on the IAC - typical for those symptoms. Probably can not hurt to replace it anyway they are a simple job and it would probably be good to learn how to do it and them keep a spare onboard. BTW, you can probably just use a good automotive one in this case although you may need to get a mercury gasket. No real reason for $150 marine branded one when a good one ($40-50) will do the exact same thing. I would stay away from some of the real cheap Chinese ones though.

-Kevin
 
So I can hear the relay click when the ignition is turned on but the fuel pump doesn't cycle like on the other engine. If it was the IAC shouldn't it start with the throttle advanced or start and stall? Would the IAC cause the fuel pump to not turn on even if the relay signals it to? I really appreciate everyone's help.
 
Doesn't sound like the IAC to me, easy enough test though to switch them. I think it's two or three screws from what I remember on mine. I replaced mine with non marine ones as well, from the Chevy dealership if I remember, my mechanic wasn't happy about that and said I had to get Marine but oh well.
 
Skicoop2 said:
So I can hear the relay click when the ignition is turned on but the fuel pump doesn't cycle like on the other engine. If it was the IAC shouldn't it start with the throttle advanced or start and stall? Would the IAC cause the fuel pump to not turn on even if the relay signals it to? I really appreciate everyone's help.
Click to expand...

Ok, I thought the starter was turning. But if just a click and no starter turn. Maybe its the ignition solenoid:

http://www.clubsearay.com/index.php...s-on-8-1-496-mercruisers.109002/#post-1321327

-Kevin
 
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