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Thread: 50HP Merc Carb Help 😢
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12-05-2021, 07:20 PM #15000 RPM
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50HP Merc Carb Help 😢
I've got a 1995ish 50HP Merc been sitting a while.
Fuel is leaking out of the main orfice plumbing and running down and out the front. Leaking everywhere.
So I took carbs apart and checked needles and seats. They look like the coating is coming off the needles and was clogging up the seats they were stuck . I've cleaned them up. Fired it up again on hose, and they were ok for about a min then back to leaking again. The top one first started leaking then 30sec later the middle carb started leaking. The bottom one never did. Took them apart again everything looks normal. Any help would be great thanks!Last edited by Keaten; 12-05-2021 at 07:34 PM.
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12-05-2021, 07:33 PM #2
Buy new needles and seats.
Check fuel psi.
Don't be cheep. Spend the $20
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12-05-2021, 07:40 PM #35000 RPM
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I don't think the needles seal anywhere other than on the very tip gold color area. So with that coating removed/scraped off they will behave normal. Could the float levels been a possible reason to the leaving fuel out the front?
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12-05-2021, 07:42 PM #45000 RPM
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Are these seats replaceable ? Look pressed in !?
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12-05-2021, 09:53 PM #5
Those needles are whipped. Only buy the merc needles, the aftermarket are useless.
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12-05-2021, 10:40 PM #65000 RPM
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Ok cool how do I get the old seats out of the carb they don't have any tool groves??
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12-06-2021, 02:02 AM #7
You don't just put new needles in.
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Keaten liked this post
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12-06-2021, 04:39 AM #8Screaming And Flying!
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Put fine steelwool on a Qtip to clean the seats.
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Keaten thanked for this post
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12-07-2021, 02:21 PM #95000 RPM
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Probably not the case but make sure the floats are not filling up with gas. I've seen a few of the plastic floats full of gas and causing the carb to flood.
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