| Enginetype: IOgas
motormodel: Mercruiser 4.3 LX
Serialnumber: 1995
Configured: single
boatmodel: Dixie l995 21'Cuddy
Boatlocation: Salt
Need_Other: Hard start
repairsdone:
Full tune up, plus fuel filter
Comments:
After sitting 2 to 3 days engine
won't start on initial try. Ether will allow start after 2 or 3 tries. Have changed
electrical piggy back clip that goes to oil sending unit and l also have changed
anti-siphon valve. No problem after engine starts for remainder of day.
Yours is a common complaint with the 4.3L
engine. Since oil pressure activates the electric fuel pump there is a lag time before the
fuel pump kicks in.
The first thing to do is make sure the
choke is closing properly. Advance the throttle until the choke snaps closed. It has to
close completely with no noticeable air gap. If it doesn't close properly, adjust the
choke.
Next time you go to start the engine.. be
sure to open the throttle a little then, crank the engine until you see about 10 to 20 psi
of oil pressure, on the oil pressure gauge. Release the key but do not turn the key off.
The fuel pump will run until the oil pressure drops to zero. After about 15 seconds,
repeat the cranking procedure. By the third attempt, it should start. As you mentioned,
this procedure should not be necessary if the engine is run every other day or so.
The only other reason for hard starting,
that isn't associated with the above cause... the carb may need to be rebuilt because the
needle and seats in the carb are sticking closed.
I am assuming you have good fuel, and a
good cranking battery, etc.
This should get you started, let me know if
you need more...
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