priming difficulty and high oil use

[oddysea1]

I have posted an issue about my 2000 Johnson 150 h.p. two stroke in reference to overly smokey at low speeds and high oil consumption.The replies had a common thread{air leak} I now realize that when attempting to prime the gas bulb it takes at least 30 or so squeezes to get the bulb hard. I do hear a pumping type sound when doing so, almost a air leak sound. If possible I am looking for suggestions to the area or possible part or mechanical causes.The primer bulb situation seems to go with the loss of pressure analysis I received as a reply to my oil use problem.Thank you Andy

 

[Joe Reeves]

Andy... A fuel/air leak, if external, would also result in a fuel leak which would be obvious via sight or via odor. If internal such as a flooding carburetor or failing fuel/oil pump... that could be diagnosed by clamping the related hose shut via a pair of vice grips somewhere between the fuel primer bulb and the engine.

The 30 pulses of the fuel primer bulb needed to get it hard is ridiculous. I don't think the human hand will tolerate that for very long. If the bulb is slow in returning to normal, a fuel restriction exists between the bulb and the fuel supply. Is the bulb old? If the bulb snaps back to normal as it should... suspect a faulty primer bulb valve... also some bulbs fail to work properly unless they're held vertically with the outlet facing up.

If the fuel supply.... tank, hose, anti siphon valve that the hose attaches to at the tank, primer bulb and valves.... all of that was okay BUT something in the engine was leaking, the primer bulb would never get hard.

This 30 pumps needed to prime the fuel bulb needs to be corrected before the excessive oil use can be looked into unless the two are connected.

Let us know what you find.

 

[oddysea1]

Thank you I may have found the source of the oil leak.Upon looking at the front of the motor I noticed a black tubular line hanging down with a small plastic clamp attached-The line comes from the left side of the block I am facing towards the transom.There are four antennae looking rods -two on either side of the block vertical to the carburetors.The furthest antennae like structure from the front on the left side of the block has the line described branching off it and the line runs under and around to the right side carburetors-however it is not attached and I can not see where it should connect.My manual at this point is vague at best.Any help would be appreciated.Andy

 

[racerone]

Pictures of this area ?

 

[oddysea1]

I am slowly figuring out the problem-The oil recycling tube broke out from the nipple.Unfortunately the nipple itself is broken off with the remains in the tube.Question how big of a job is it to replace the nipple or part that holds the nipple.I feel the bottom cowling must come off for easy access.Andy

 

[jakedaawg]

Which nipple? Brass or plastic? Nipple on the block, manifold, VRO, air silencer, throttle body, carb?

I agree with Joe that the prime bulb also should be addressed immediately after mystery hose/nipple.

some times the noise you hear when squeezing bulb is fuel/air going through a noisy anti-siphon valve.

a picture is worth a thousand words. Both close in and further back for reference.

 

[oddysea1]

The nipple is plastic with one screw and one o-ring it is located center and under the carburetor cover at the base of the block.I am going to remove the bottom cowling to get a good look and approach to the nipple.Unfortunately I don't own a phone with a camera.I am hoping this mystery is solved.I appreciate your time and advice and will let you know about the final outcome hopefully by Tues. when I get the part.Regards Andy

 

[Faztbullet]

That the bottom recir/drain cover on a 60 degree but that wont cause priming issues. Make sure you have OEM bulb and check anti siphon valve/selector switch if equipped...

 

[w2much]

That nipple can be fixed with a plastic or brass barbed fitting either screwed into or epoxies in place. The oil recirculation if left will eventually make a mess but as Faztbullet said will not affect the priming issue. When you pull the lower cowl off unhook your fuel line squeeze the primer bulb and see what happens. Let us know.