83 johnson 150hp no fuel to plugs

[sun knee]

Hi I'm working on a boat and engine my brother has given to me. I've changed the fuel lines due to age. I've also changed the plugs and checked for spark and checked the fuel in tank.There isn't any water in the fuel. I can only get the motor to run on fuel poured into the cylinders. Did I put the fuel lines in the wrong places? Do I need new fuel pumps? How and what can I check systematically to find the problem that I'm having?? Thanks for your help I've been reading and know how knowledgable that this site is.

 

[emdsapmgr]

Re: 83 johnson 150hp no fuel to plugs

If the boat has old fuel in the tank, purge it and start with new fuel. Prime the carbs by squeezing the hose bulb till it gets hard. At that point the carb bowls should be full of fuel. Remove a carb drain plug on each carb bowl (there is one on each side.) You should get fuel out of the bowl. Reprime the hose bulb and try to start. If the engine will still not fire, pull the plugs and record your findings. If the plugs are wet, you are getting fuel and you need to look for a spark issue. If they are dry, no fuel is getting through the carbs and you may need to disassemble and completely clean and rebuild them. A weak or non-functioning fuel pump can be overcome by constantly squeezing the hose bulb-it forces fuel around the pump, directly in the carbs.

 

[tashasdaddy]

Re: 83 johnson 150hp no fuel to plugs

agree ^^^ read ethanol and carb cleaning >> http://forums.iboats.com/showthread.php?t=299680

 

[sun knee]

Re: 83 johnson 150hp no fuel to plugs

Hi guys, I do have new fuel and the tank was flushed out. When priming, the bulb gets hard, and I can hear the gas going through the lines. I will now check the carb drain screws. I have checked the spark and it is fine. When cylinders are filled it will start. Leaning towards the carbs being blocked now. Will check back on what I find. Thank you for the replies. sun knee.

 

[sun knee]

Re: 83 johnson 150hp no fuel to plugs

Well I checked the carb screws and there is gas in the bowls. I did find a hose coming off of the fuel solinoid the one with the red lever on it. The lever is at 9:00 o'clock position and there was a small nipple on the back of this solinoid that I believe takes this hose. Am I correct in this? The solinoid has a hose that is larger going to the fuel tube to the 3 carbs. Then there is this thinner tube from the back of the solinoid which is where I looped it around back to the solinoid again is this the correct routing of the fuel lines to this fuel solinoid? Help please thank you.

 

[sun knee]

Re: 83 johnson 150hp no fuel to plugs

Does anyone have a diagram of the enricher system hose routing for an 83 Johnson 150hp v6. Thanks.

 

[mikesea]

Re: 83 johnson 150hp no fuel to plugs

Sounds like you need to rebuild the carbs.Thats just a given for an eng that sat for a while.The unit with the red lever is a primer.Its your choke.The lever needs to run in line with the primer,not at a 90 degree .It takes fuel thru the larger hose that connects to main fuel line at carbs,then the smaller go to ports that pump raw fuel into the manifold,if you can follow the small lines you will see that one actualy t's off so you have 3 small hoses feeding the 3 intake ports of the manifold.I suggest you dont mess around trying to run the eng.by spraying gas into it .You dont want the motor to run LEAN,that will blow it up.Find the yr.and horsepower up on the iboats store and buy 3 carb rebuild kits.You will also want to buy a carb soaking kit at your local NAPA Discount auto,etc.Remove and completly take the carbs apart.Be sure to number the carbs so you know where they go,you should also try to keep all parts together for each carb,BUT,thats not absolute.You will need to remove the jets,the highspeed jets are found inside the bowl ,behing the brass plugs on each side of the bottom of carb.You need the carbs to soak for a few hrs,get a spray can of carn cleanes AS WELL,its only in addition to soaking,after soaking in carb solution,I LIKE to use good hot soapy water and swish the carbs off,then I use the garden hose,then its great if you have compressed air,its almost a necessity,after all that I shoot the spray cleaner into every hole,passage etc I can find in the carb.You want to be sure the carb kits come with new NEEDLE and SEAT,I suggest new floats,some kits have all parts,some dont,before you install the carbs,be certain to flush all lines of old fuel.Stay in touch with progress.Last thing,you NEED a new water pump impeller too.Likely just the impeller.You can order it here too.

 

[sun knee]

Re: 83 johnson 150hp no fuel to plugs

Thanks for the response Mikesea. I have the larger hose that goes to the solinoid to the fuel lines to the carbs. There is 2 little nipples coming out of the solinoid also that hasn't any hoses connected anywhere? Where do these go to?

 

[emdsapmgr]

Re: 83 johnson 150hp no fuel to plugs

If the two small hose barbs on the top of the primer solenoid are not connected- that is perhaps why it is difficult to start when cold. These are the outlets used for cold starting. You will need a couple of feet of some very small primer fuel hose (see your dealer) and a single plastic tee for that line. The two hose barbs must feed three lines (that's why you need the plastic tee) which will connect to the brass hose barb on the top of each carb. Before you connect the three hoses to the carbs, depress the key when in the on position and insure that the primer solenoid is pumping fuel out of each hose. Once you know the primer pumps fuel out of the three hoses, connect them to the hose barbs on the top of the carbs. Push in for 10-15 seconds on the key to activate the primer solenoid, then turn to start. Once started, you may have to occasionally push the key in to keep it running till it warms up. Be careful installing the hoses, their holes are pretty small, and it is easy to damage the hose barbs on the primer or the tee fitting.

 

[sun knee]

Re: 83 johnson 150hp no fuel to plugs

Thank you emdsapmgr for your reply. I've been checking out parts listings under intake manifold at various marine sites. They show the primer solinoid but not the routing of the two fuel lines off the primer solinoid. I will install as noted.Thank you very much I was feeling lost in the forums for a moment. sun knee.