J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

[k_emarine]

Hi I have a 1996 J150GLEDB (optical motor) for some reason it will not idle at all. It starts right up and runs and then acts like it runs out of fuel. If I bottle feed it with gas it will run all day. I have tried a new vro and the vapor pump that attaches to it. Still the same problem. Pulled carbs and cleaned twice and they seem to be spottless. When I first start working on it it would go wide open fine just not idle now it will only run no matter one for a minute or so and then run out of fuel. I did some research on the carburetors and found that the port and starboard are different part numbers which I did not realize I thought that all 6 were the same. Could someone verify if they are different and if so how do I tell the difference. Any input would be greatly appreciated. Thanks in advance!

 

[boobie]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

Basics first. What's the compression on it ?? Will the spark jump a 7/16" open air gap on a spark tester ??

 

[k_emarine]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

I will double check when I get a chance but off the top of my head I think it was 110 accross the board

 

[bob johnson]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

Basics first. What's the compression on it ?? Will the spark jump a 7/16" open air gap on a spark tester ??

Boobie....I am thinking when the OP says the motor runs fine with a bottle of gas feeding it...but wont run on the boats fuel system.....you can rule out compression as the cause!!!.....he basically in my mind has narrowed down the issue tremendously. going forward...I wonder what could cause idle issue that doesn't also cause higher rpm issue that can be solved by bypassing the fuel supply chain!!! hmmmmmmm......let this fester.. bob

 

[bob johnson]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

there are starboard and port THROTTLE BODIES, but not CARBS!....I am pretty sure the carbs are all identical( all 6 ) many people just take the whole throttle bodie and carb off as a unit.....in that case there will be a right and a left..and they need to go back to the same place they came from... I hear people say they pulled the carbs and cleaned them then re assembled.... I wonder.... are they using a rebuild KIT with NEW gaskets and NEW COMPONENTS??????...... especially the float needle and seat and gasket!!!!!!!!!!!!!! when you say you use a bottle to feed the motor gas and it runs good... can you elaborate on that scenario???? are you SPRAYING gas into the carb opening???? or do you have a gas line hooked up to a bottle and are feeding the carbs via the motors gas lines??????? if you are feeding the gas through the motors fuel lines on the power head...and it runs good...then id rule out any issue with the carbs....as the gas is going through them to run the motor......you should look prior to where you are feeding the gas in the system....like all the connections especially at the cowl and inside the gas tank....get back to us....bob

 

[boobie]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

Bob. You never trouble shoot a mtr without doing the basics first. Anyway I never did. That way you know what you have to work with !!

 

[bob johnson]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

so...just for basic reference you are saying.... I guess I agree....why put the effort into a motor with a bad cylinder or two!!...my point was, that compression couldn't be the cause of his issue...... bob

 

[k_emarine]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

by bottle feeding i mean that i have a 50:1 mixture in a squirt bottle and am spraying it into the carbs and it will continue to run but as soon as i stop so does the motor. tryed running the motor on the boats fuel tank and a seperate 6gal fuel tank. same result on both. carbs have new gaskets and needle and seat look perfect. will replace if need be.

 

[Joe Reeves]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

Since I retired a few years before this engine was designed, I've simply stayed in the background observing the posts... however, I see no mention of the following so I am posting it here as a curious question of sorts.

If you have not pumped the fuel primer bulb on a constant steady basis, acting as a manual fuel pump to keep those carburetor full, do so. If this makes a difference in the operation of the engine, then obviously you have a fuel supply problem (tank to carburetors).

Let us know what you find.

 

[k_emarine]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

I did that as well and did not make a difference. and as i noted above both of the fuel pumps are brand new.

 

[Joe Reeves]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

I did that as well ((constantly pumping the fuel primer bulb)) and did not make a difference. and as i noted above both of the fuel pumps are brand new.

I assume that you have double checked to make sure that fuel is actually entering the float chambers? Many of those engines, or at least the ones I've encountered in the past, have a thick rubberized type gasket on the back of the carburetor face plate that seats against the carburetors which acts as a sort of air restriction (built in choke type device you might say). The engines I've encountered in the past would not run any length of time without the face plate being installed.

Okay, I'll back out of here as I'm not familiar with that design... just wanted to put my two cents worth in.

 

[daselbee]

Re: J150GLEDB 1996 Will not idle at all without bottle feeding with fuel.

Clean the throttle body idle circuits which are located behind the small plate that is held on by two screws. Get the tiny holes that feed gas thru the venturi side to the engine. I assume you have cleaned the brass tube that extends down into the float bowl, and ensured that you can both blow and suck air thru it? Crucial to idle gas feed.