J-Rides
New Member
- Oct 11, 2022
- 17
- Boat Info
- 1986 Sea Ray Sundancer 340 Express Cruiser
- Engines
- 5.7L Mercruisers
Hey everyone, I have an '86 340 Express Cruiser with two Merc 260's - that's the 5.7L Chevy Small Block. Each engine has a 4 barrel quadrajet carburetor, from what I understand. I will confirm before I do any tuning on them, but I think that's what came stock on these engines.
From my manual it appears as if I have two 102 gallon fuel tanks for a total of 204 gallons. However, my experience is telling me that either I have the smaller tanks (72 gallon port and 80 gallon starboard) OR one of my new fuel senders is reading wrong, OR my port engine is burning considerably more fuel than the starboard engine.
Can anyone tell me if the EC ever came with the smaller tanks or did they all come with the twin 102 gallon tanks? Again, when I look in the manual it would appear I have the twin 102 gallon tanks but something is not adding up. I obviously hoping this is just a matter of the fuel senders reading wrong.
My other issue is that both engines smell like they're running rich - both at idle and at a reasonable cruising speed of about 7-9mph. Is that normal? I've done quite a bit if snowmobile carb work, but never done carbs like this... maybe its time I learn. I do plan to pull some plugs this weekend and try to get a read on how they're burning. I also plan to run a gallon of Berryman b-12 in each tank, change the fuel/water separators and change the oil on both engines this weekend - you know, yearly stuff. But I appreciate other and advice or tips.
Thanks for the help!
From my manual it appears as if I have two 102 gallon fuel tanks for a total of 204 gallons. However, my experience is telling me that either I have the smaller tanks (72 gallon port and 80 gallon starboard) OR one of my new fuel senders is reading wrong, OR my port engine is burning considerably more fuel than the starboard engine.
Can anyone tell me if the EC ever came with the smaller tanks or did they all come with the twin 102 gallon tanks? Again, when I look in the manual it would appear I have the twin 102 gallon tanks but something is not adding up. I obviously hoping this is just a matter of the fuel senders reading wrong.
My other issue is that both engines smell like they're running rich - both at idle and at a reasonable cruising speed of about 7-9mph. Is that normal? I've done quite a bit if snowmobile carb work, but never done carbs like this... maybe its time I learn. I do plan to pull some plugs this weekend and try to get a read on how they're burning. I also plan to run a gallon of Berryman b-12 in each tank, change the fuel/water separators and change the oil on both engines this weekend - you know, yearly stuff. But I appreciate other and advice or tips.
Thanks for the help!