need a little help

bluez · 06-02-2009, 10:02 PM

hello all, im new to the boating world. i just picked up a 81 sea ray 305. i/o i know its old but its in real good shape. i have put in a new starter,plugs,wires,cap,rotor,rebuilt thecarb,new coil,fule/water sep. i have gone threw this motor real good. i have been working on cars for a long time. but boats are new to me. ok now to my problem. it will turn over and fire and run for about 30 sec. if i keep giving it a little gas i can keep it running for a few min. but wont idle its almost like its running out of gas. it also did this befor i rebuilt the carb.i have played around with air fule mixture with no real changes. im kinda stuck. any one have any ideas?

jeffswav · 06-02-2009, 10:43 PM

Do you have fresh fuel in the tank?

bluez · 06-02-2009, 10:47 PM

yes. drained it. ran the same. i also just tryed to run it off a gas can just to check.

picklenjim · 06-03-2009, 12:29 AM

Try turning up the idle screw until it stays running then adjust your idle mixture screws.If you can get them to a point where it runs smoother and faster then start turning down the idle screw.I'm assuming you have the timing set correctly.It could also possibly need a fuel pump.

Boat Tech · 06-03-2009, 12:42 AM

Quote:

Originally Posted by bluez

yes. drained it. ran the same. i also just tryed to run it off a gas can just to check.

That helps now you know it is the engine, Try to find a way to test the fuel pump pressure. Most carb engines are round 8 [psi]

bluez · 06-03-2009, 11:52 AM

i will put a fule pressure gauge on it today. but if that was bad would i be able to keep it running for a few min? i know it will run for a little with the fule in the bowl.

26sxl · 06-03-2009, 12:12 PM

1981 has a points dist. ,you didn't say anything about that. New points and cond. dwell @ 30* timing @ 8btdc. That being said when it is running is there good throttle response?

bluez · 06-03-2009, 01:03 PM

yes i have done all that. cond...points. all set at factory specs. the response is not that good.

26sxl · 06-03-2009, 01:23 PM

bluez,have you tried a remote fuel can hooked to your fuel pump? There is also a check valve in the main fuel line between the pump and the tank that has been known to go bad before.Do you have a quadrajet on it??

bluez · 06-03-2009, 01:26 PM

Quote:

Originally Posted by 26sxl

bluez,have you tried a remote fuel can hooked to your fuel pump? There is also a check valve in the main fuel line between the pump and the tank that has been known to go bad before.Do you have a quadrajet on it??

yes it has a 4 b quadrajunk on it. i have tryed a remote fuel can.