The one way valve may have failed and if this is the case replace the bladder or fuel line.
If the fuel bladder pumps up hard and their are no fuel leaks or air leaks install a fuel pump kit to refurbish the existing pump ,this is cheap and easy to do
The dry weight of a 1992 model, 25 hp Mercury outboard, is 112 lbs.
A Mercury outboard will run well with a plug gap of .035 - .040 in.
An 8 hp Mercury outboard, serial number OD134137, is a 1992 year model.
A 9.9hp Mercury outboard, serial number OD127373, is a late 1992 year model.
the mercury serial that starts with OD started from 1992 -1995
396 pounds
An 8 hp Mercury outboard, serial number OD140284 would be a 1992 model.
The recommended spark plug for a 1992 model, 200hp Mercury 2 stroke carbureted outboard, is an NGK BU8H. This is a perma-gap type plug, so no gap setting is required.
50:1 is the correct mixture for a 1992 Johnson 60 hp outboard.
An 1992 model, 120 hp Evinrude Ocean Pro outboard weighs 370 lbs.
About 355lbs
1992