WOT problem/ fuel system issues: 40 hp mercury, 2 stroke, 4 cyl- 1990's

N

neamakri

Cadet
Joined
Aug 7, 2011
Messages
14
I have a 40 hp mercury, 2 stroke, 4 cyl- 1990's. will idle fine, run in the driveway ok. At plane/ wot - it dies. IT started 4 trips ago. 1st trip would go to WOT, but got on plane, second trip, got on plane in the am, would not plane later, last trip , would not plane.

I have checkd the following:

1. fuel - it s new
2. fuel lines- replace some, not leaks
3. fuel filter (in line) - clean
4. water sperator- ok, v. clean
5. tank- new

have not checked
1. compression
2. fuel pump

its a 1990's 2 stroke, 4 cyl. ( dont know exact year)

thanks for the help.
 
P

pootnic

Chief Petty Officer
Joined
Aug 11, 2007
Messages
447
Re: WOT problem/ fuel system issues: 40 hp mercury, 2 stroke, 4 cyl- 1990's

Anyone...
It still may be a fuel issue.
Try pulling the choke see if that helps a bit,if not try sqeezing the fuel ball,see if that helps.
Your fuel tank has a vent,is it working?
Simple stuff first....
Compression check wouldn't hurt,could have to rebuild fuel pump or have carbs cleaned also.
Whats it doing,when won't plane...does it try to pick up rpm?
 
N

neamakri

Cadet
Joined
Aug 7, 2011
Messages
14
Re: WOT problem/ fuel system issues: 40 hp mercury, 2 stroke, 4 cyl- 1990's

got a new / old pair of WMA carbs of ebay, cleaned them up , rebuilt fuel pump, changed all fuel lines to ethonal standards ( thanks Obama) and it runs great in the driveway.
I have the screw set to 1 1/2 turns out, now its time for the river . any sugeestions on adjustments ?
 
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