1978 80hp mariner 4 cylinder

biggie · #1 February 21st, 2007, 06:33 PM

I just rebuilt carbs and installed them, tryed to start motor. it took a few trys then started up for a few seconds. you can see fuel going to carbs, but fuel is also squirting out of lower carbs fuel bowl jet vent, should this be happening, it seems that a excessive amount of fuel is coming out and leaking in to the motor houseing, any ideas would be appriciated

Laddies · #2 February 21st, 2007, 07:11 PM

No it should not leak fuel ouy of the vent some will dripple if over primed, You need to ck your work and be sure to ck float level

JUSTINTIME · #3 February 21st, 2007, 11:53 PM

yep sounds like float height that laddies said

jimmbo · #4 February 22nd, 2007, 12:25 AM

Or a leaky float needle valve, maybe a bit of dirt,

biggie · #5 February 23rd, 2007, 06:05 PM

if the floats are set wrong and cause excessive fuel to be allowed in the bowl, would this cause motor to flood and not start proper,

Laddies · #6 February 23rd, 2007, 06:28 PM

biggie · #7 February 24th, 2007, 08:24 PM

okay I fixed the floats now, the motor starts, and there is no excessive fuel icoming out . But when I go to put the warm up lever down the motor dies out after about 3 seconds, any ideas as to why. thanks for all your help so far

Laddies · #8 February 24th, 2007, 09:49 PM

Try to pump the bulb as you run it, if that takes care of the problem the fuel pump is not working properly

biggie · #9 February 24th, 2007, 10:33 PM

First I want to thank Laddies for all the help you have provided to me so far. This might be a dumb question but is it bad to run the motor in gear with the warm up lever pulled up, and what purpose does the warm up lever really serve. This is my first boat so I am just learning as I go, the man who sold it to me was hard of hearing and it was hard to get answers from him.

JUSTINTIME · #10 February 24th, 2007, 11:38 PM

warm up lever advances the throttle
u might need to sync and link

Don S · #11 February 24th, 2007, 11:49 PM

The warm up lever is nothing more than a throttle in neutral.
But you still don't want to run the engine at too high an rpm. So you have to monitor it.
Keep it in the 1500 to 2000 range for the first few seconds till it will run on it's own, then let it idle.
After a rebuild, the carbs will need an idle mixture adjustment. The book settings are nothing more than a starting point for the mixture screws.

Might want to read this thread also.
http://forums.iboats.com/bbBoard.cgi...6;gtid=1105882