Evinrude 150, carb issue

[NvrLose]

Very low usage motor (only 155 total hours), on last outing, ran out of fuel, but ran fine after refueling. Motor has sat unused/unstarted for past 2 months.<br /><br />Primer bulb gets firm, but loses firmness after several starting attempts. Noticed fuel leaking from vapor separator cover when squeezing bulb, replaced vapor separtor cover gasket, no more leaking, still won't start.<br /><br />If choke is applied manually on the primer silenoid, fuel will leak around the switch when squeezing primer bulb, but does not leak if manual choke is left in normal position (is this a real worry?)<br /><br />Followed starting procedures as posted in site FAQ, after spraying fuel mix directly into intake engine fired almost right up (unwarranted elation on my part!) but died as applied fuel was spent.<br /><br />I then was able to keep the motor running indefinetly by intermittently pushing in the key to apply choke when it sounded like it was about to die (about every 2-3 seconds).<br /><br />What could could cause all six carbs to not deliver fuel yet allow the primer selenoid to deliver the fuel?<br /><br />Thanks in advance

 

[1986mariner150]

Re: Evinrude 150, carb issue

sounds like you are still sucking air. air is much easier to pump than gas, so given the choice it will be air every time.

 

[NvrLose]

Re: Evinrude 150, carb issue

If I am sucking air, why would the primer still continue to sucessfully suck gas and put it to the engine?

 

[kgw]

Re: Evinrude 150, carb issue

Alex,<br />Leaking fuel is always a big problem. The primer sol. injects fuel behind the cabs into yhe intake manifold so you could still have a carb fuel issue,you can buy all the parts to repair that primer sol. Do that first and fix the leak then go from there.The primer may be sucking air in the normal run setting.

 

[BKool68]

Re: Evinrude 150, carb issue

I am not sure what you mean by the vapor seperator. If you mean the air box cover I would suggest removing it an dseein if the fuel leak is from on of the carb vents. You may have a float needle not seating or a bad fuel float.

 

[Rick B]

Re: Evinrude 150, carb issue

I had the same problems on my '96 150. I dont know the year of your motor, but I can tell you that I fixed mine by replacing the vapor pump diaphram. This is the thingy just above the primer solenoid that has a hose connected to the block, and hoses that connect to the air cover. You might want to check out the fuel pump as well, Good Luck

 

[OBJ]

Re: Evinrude 150, carb issue

Alex....ANY fuel leal is an issue. This means fuel is going places other than to the engine. Replace the maint. vlv on the primer. It's probably cracked.<br /><br />Please post the engine year so we will know what kind of fuel system you have.<br /><br />Thanks.

 

[NvrLose]

Re: Evinrude 150, carb issue

Wow, some fantastic posts and I'm going to be hitting the manual tonight to follow up on some. The engine is a '96 E150EXEUE, to follow up with OBJ.<br /><br />Thanks in advance.

 

[Rick B]

Re: Evinrude 150, carb issue

You have the same engine as me, and as I said earlier, my problem was the vapor pump. You can buy the diaphram or the whole pump. The part numbers are 0433352 for the assembly, or 0331307 for the diaphram. I got mine from dougrussell.com at a reasonable price.

 

[NvrLose]

Re: Evinrude 150, carb issue

Rick, thanks for the follow up, and especially the part numbers! I'm taking off the vapor pump tonight and will start my hunt locally for the part tommorow and order from dougrussell.com on Monday if I can't find it. Just out of curiousity, were you able to keep yours running by using the choke?<br /><br />Thanks in advance!

 

[NvrLose]

Re: Evinrude 150, carb issue

OK, I've got the head off the primer selenoid and sure enough there is a hairline crack in it, hower I suspect the O-ring is the root of why it's leaking when manually choked.<br /><br />But back to the main peice, the vapor pump is also off and apart and shows now apparent signs of fault. Did you see any on yours when apart? Forgive my stupidity, but what does the vapor pump do?

 

[Rick B]

Re: Evinrude 150, carb issue

Hello Alex,<br /> My engine would keep running when I turned the red primer lever c-clockwise and back. Pushing in the choke also helped, but not for long. My vapor pump diaphram was a little bit expanded ( worn ). The vapor pump pumps any air out of the vapor resevoir and sends it out into the airbox. If the vapor pump is in-operative this can lead to vaporlock, as well as not enough vacuum to draw gas from the tank. One thing that I did to diagnose the problem was to pump bulb till stiff, start engine and remove fuel inlet from the fuel pump and feel for vacuum from inlet nipple on fuel pump. The was none in may case. Your primer solenoid could be the culprit as it is introducing air into the system. Just for your info the part numbers are as follows<br /><br />solenoid cap ( gasket housing sits under valve housing - 0341297<br />o-ring solenoid valve -0331365<br />solenoid valve ( red lever) housing - 0341071<br /> If I did not cover the part with the hairline crack, let me know.<br />Rick

 

[kgw]

Re: Evinrude 150, carb issue

Hi Alex,<br />Make sure you inspect the new red lever valve be fore you get it home.When I went to buy one every one the dealer had in stock was cracked in the same place as my old one. Factory must have had a bad run

 

[NvrLose]

Re: Evinrude 150, carb issue

After taking the vapor pump apart, I think I'm going to feel more comfortable ordering the whole assembly instead of trying to replace just the diaphram. No one local has it in stock so I'll be ordering all the parts on Monday.<br /><br />Another quick question, what does the air valve do on the primer solenoid? And for Rick B, is part # 0341071 the red peice that the o-ring fits on to?<br /><br />I'm glad I'm tryine this before tearing down the carbs as it seems to make more sense. Just for sanity.....if I had 1 or even 2 carbs that were gummed up, or otherwise malfunctioning, would the enging refuse to start...and then start when fuel was sprayed directly into intake? I would suspect that the cylinders that which had functioning carbs would continue to at least try and fire?

 

[Walker]

Re: Evinrude 150, carb issue

The air valve is mainly for oil fogging for off season storage.

 

[Rick B]

Re: Evinrude 150, carb issue

0341071 is the housing that the red lever sits in. The red lever part number is 0175158.

 

[NvrLose]

Re: Evinrude 150, carb issue

Hooray!!!!<br /><br />Guess what? I replaced the Red Lever and the vapor pump and the engine barked with delight as it fired to life! Running like a champ, in the driveway at least....I'll be putting it in the water this evening to make sure that all is well.<br /><br />So, at a minimum Rick B, I owe you dinner if your ever in Jacksonville, and if you golf I'll make sure you get a round in at TPC at Sawgrass. Everyone else I talked to said 'rebuild the carbs', so you saved me a considerable amount of time and frustration, and for that, I am indebted.<br /><br />Did I say 'Hooray!' yet? HOORAY!!!!!!!

 

[Rick B]

Re: Evinrude 150, carb issue

Glad I could be of help. I had the same problem, and everyone told me to rebuild carbs also. I knew it could not have been the carbs because she ran as long as I pumped the bulb.<br /><br />HAPPY BOATING!!

 

[paboater]

Re: Evinrude 150, carb issue

Hey alex I am kind of having the same problem, I replaced the red lever but where is the vapor pump? How much was it? I have a 1993 175HP almost the exact same motor. But Mine will run when I first take it out for about 2-3 minutes and then just shuts off and won't restart.

 

[NvrLose]

Re: Evinrude 150, carb issue

I'm not sure if it's the same problem as mine wouldn't even start unless I sprayed fuel directly into the intake, and then it would only run for about 15-20 seconds (until the sprayed in gas was depleted). As posted by Rick B, the part numbers are 0433352 for the entire vapor pump assembly, or 0331307 for the vapor pump diaphram. It's obviously cheaper to just buy the diaphram, but I've got fat fingers and don't trust myself to get all the little peices back together and sealed properly, so I just paid $35 for the entire assembly as it's ready to go out of the box.<br /><br />The vapor pump is square in shape and attaches to the vapor seperator with two screws (there are four screws on the vapor pump, two that hold it together and two that attach it to the vapor separator). Follow the two hoses from your air silencer and they will lead you as they connect directly to the vapor pump. If you replace the pump, pay close attention to ensure that you get the o-ring off the old pump (where the pump meets the seperator) and put it on the new one.<br /><br />I could be wrong, but it sounds to me like you might have a fuel pump problem as if your boat runs for 2-3 minutes before stalling, it sounds like it's emptying the carbs and not able to refill them. Try keeping it running by intermitently applying the choke as it will bypass the carbs. This should tell you wether the problem exists in the carbs or in the fuel pump....but I'm not even qualified as a backyard mechanic so I would certainly ask some of the experts around here too! Will it restart if you prime the bulb again?