SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 90ultra21lx on October 02, 2017, 04:35:02 PM
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Hey everyone just wanna get ur guys opinions, rebuilt 454 this season, carb got rebuilt as well, (3rd time this season, twice now since motor rebuild) went on test drive Friday with mechanics boat runs perfect for 2 hours, turns off 25-30 times, fires right up all good, put on trailer take down street to campground launch it n it barely starts n runs like its flooded. SzALWAYS. Does it after sitting 20/30 min after being warmed up, they take carb apart say needs rebuild, jets n carb clogged? We're starting to think there's a internal leak we can't see? Slowly leaks n floods over 20 min? Any help appreciated.. Holley single pumper 650(maybe 600) but single pumper
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Can you identify where it's leaking from?
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Common problem is the body on the Holley carbs warp over time. This is due too over tightening the bowls usually. Heat also will distort the body over time. I have seen brand new carbs do the same. Generally from your description of what is happening that is the most common issue. Check your fuel pressure as well I do not like more than 5.5 psi. Too much effort for the needle and seat.
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Are your fuel tanks vented properly?
How are the fuel lines routed?
What fuel pump? Regulated?
Float levels set correctly?
Is the carburetor completely stock?
Honestly it sounds like the wrong metering block gaskets are being used...... Happens often.
GT
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Common problem is the body on the Holley carbs warp over time. This is due too over tightening the bowls usually. Heat also will distort the body over time. I have seen brand new carbs do the same. Generally from your description of what is happening that is the most common issue. Check your fuel pressure as well I do not like more than 5.5 psi. Too much effort for the needle and seat.
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Interesting I’ll def have him check that for the warping and to see the fuel pressure..
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Are your fuel tanks vented properly?
How are the fuel lines routed?
What fuel pump? Regulated?
Float levels set correctly?
Is the carburetor completely stock?
Honestly it sounds like the wrong metering block gaskets are being used...... Happens often.
GT
My phone was acting up yesterday couldn’t really type, but after the boat acted up again on Friday, mechanic came and put another carb on, it was off his boat, it was a 950 double pumper, def too much carb for motor but idea was to try and isolate problem, boat ran great all Saturday, I mean it bogged down lil at 43-4500 rpm n ran rich but it fired up every time right away and never flooded, so the problem appears to b in my carb, so after all that u still think I should mention the metering block gaskets? Or anything else? I really appreciate all ur guys opinions n help... I’m sooooo close to having a top shape running and looking boat after wayyyyyy more cash than I’d like to remember but the kids love it so screw it right! Lol I gotta put some pics up, completely redid interior, motor, jet, transom, stereo, etc etc etc lol
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My phone was acting up yesterday couldn’t really type, but after the boat acted up again on Friday, mechanic came and put another carb on, it was off his boat, it was a 950 double pumper, def too much carb for motor but idea was to try and isolate problem, boat ran great all Saturday, I mean it bogged down lil at 43-4500 rpm n ran rich but it fired up every time right away and never flooded, so the problem appears to b in my carb, so after all that u still think I should mention the metering block gaskets? Or anything else? I really appreciate all ur guys opinions n help... I’m sooooo close to having a top shape running and looking boat after wayyyyyy more cash than I’d like to remember but the kids love it so screw it right! Lol I gotta put some pics up, completely redid interior, motor, jet, transom, stereo, etc etc etc lol
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After all that work just bite the bullet and buy a new carb. Spend a lot less time worrying about shit and enjoy the rest of the season.
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My phone was acting up yesterday couldn’t really type, but after the boat acted up again on Friday, mechanic came and put another carb on, it was off his boat, it was a 950 double pumper, def too much carb for motor but idea was to try and isolate problem, boat ran great all Saturday, I mean it bogged down lil at 43-4500 rpm n ran rich but it fired up every time right away and never flooded, so the problem appears to b in my carb, so after all that u still think I should mention the metering block gaskets? Or anything else? I really appreciate all ur guys opinions n help... I’m sooooo close to having a top shape running and looking boat after wayyyyyy more cash than I’d like to remember but the kids love it so screw it right! Lol I gotta put some pics up, completely redid interior, motor, jet, transom, stereo, etc etc etc lol
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Pull the metering blocks and the bowls off and look at the gaskets and how they line up. You can post some pictures of it if you want. You can have the blocks off in a manner of minutes. Make sure to plug the fuel line. Don't want to have to name the boat Molotov afternoon... LMAO
GT
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I think Brad had an issue a while back with a metering block gasket. I don't remember the symptoms, but am pretty sure that's what the problem was.
You're not alone. Boats are like a wishing well. You keep throwing money in them saying "I wish this worked" "I wish it was faster" " I wish it was shinier "....
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