fuel pump rod missing?

[redfury]

I'm posting this for my brother, but I'm familiar with his engine ( I do the mechanical work for him ).

He's got a 1985 85hp 'Zuki that won't start. We've got 125psi per cylinder ( lucky us! ) and I verified spark.

I can see that we are getting fuel at the filter, and fuel is flowing through the fuel pump assembly.

However, we get no kick like the motor is starting or trying to start ( it turns over fine...new battery ) The plug I pulled was dry. So, the first thing I did was check the fuel pump. I pulled the pump off the motor and discovered that there was no "rod" or "lever"..whichever you want to call it...coming out of the motor and into the fuel pump.

I'm not super familiar with marine engines in particular, but I've studied the books and schematics enough to realize that 2 strokes aren't much different in fuel delivery than a 4 stroke engine.

Pulling the pump off and apart, it has a diaphram style fuel pump, the diaphram looked solid and flexing it did not reveal any cracks. However, the metal striking plate showed signs of wear in a small circular pattern. This makes me assume that the pump is delivered it's "pulse" through a rod from the block moving the diaphram against the spring inside.

there was no rod.

Previous owner "claimed" to have disconnected the oil injection system prior to parking the boat after they ripped off half the skeg and chewed up the prop prior to the boat finding dry land for the last 5 years ( they also "claim" to have replaced the driveshaft..yet the skeg and prop are clearly damaged and need repair ).

I'm wondering if they pulled the fuel pump rod thinking they were disconnecting the oil injection system ( which is not easily accessible from my observation ).

However, that being said and done, a .pdf file I downloaded of the engine systems broken down part by part, system by system - reveals no "rod" in the schematic, nor references it in the part identification table in the fuel pump section, thus my confusion.

It's obvious it had one at some point, but why was it removed, and is this the cause for a no start condition?

I can only assume that if the engine started 5 years ago, it was because there was fuel in the fuel bowls and it was able to draw enough fuel through vacuum

 

[deejaycee_2000]

Re: fuel pump rod missing?

There is no rod, it works with a vacuum system, only the oil pump has a rod that you take out to disconnect it ..... if the diaphram is ok then your fuel pump should work fine, you will then have to take a look at the carbs, they are very sensitive and the smallest piece of dirt can cause it not to work .... also have a look at the reed valves ..... good luck

 

[JB]

Re: fuel pump rod missing?

Outboard Wont Start:

1. Electric start: Does the starter engage and rotate the flywheel at a good (normal) speed? If yes, go to 2.

* Does starter spin, but bendix gear (small gear on starter shaft) does not engage the flywheel? Lubricate bendix spiral shaft.

* Does the solenoid click?

* If yes, measure voltage at the starter terminal to battery ground with starter engaged.

* If 12 V, repair or replace starter.

* If less than 9V measure voltage at large solenoid input terminal (from battery).

* If less than 9V, go to 3. If 12V, replace solenoid.

* Solenoid does not click when key is turned to start. Measure voltage at small solenoid terminal.

* 0 volts? Troubleshoot kill switch (lanyard connected?), battery, starter switch and neutral start switch in controller.

* 12 volts? Replace solenoid.

2. Flywheel rotates but engine does not attempt to start. Electric and manual start.

* Remove a spark plug, reconnect it and hold it against engine block. Keep it there while turning engine over. Does it make a hot, blue spark when attempting to start? If no, troubleshoot ignition system.

* Has hot, blue spark. Squirt some fuel mix (NOT ether) into the carb(s). Does it attempt to start?

* If yes, you have inadequate fuel. Troubleshoot fuel system and review starting procedure.

* If no, check that carb is not flooding from failed float needle.

* Still wont attempt to start. Check compression. If bad, troubleshoot mechanicals.

* Good compression on all cylinders. Check flywheel for sheared key, check crankcase for sealing at carb(s), inlet manifold and bypass covers.

3. Low voltage at starter when engaged.

* Measure voltage at battery terminals. If below 12.6 volts with all electrics turned off, recharge or replace battery.

* Measure battery voltage with starter engaged. If below 9 volts, recharge or replace battery.

* Remove and clean connections on battery-to-solenoid cable, battery-to-engine block cable and solenoid-to-starter cable. While they are off, inspect each for corrosion, broken insulation with corrosion and weak points. Replace corroded or weak cables.

* If problem persists, remove starter and clean all surfaces where engine block and starter connect.

 

[redfury]

Re: fuel pump rod missing?

thanks for the input guys!

I wish I had taken a picture of that diaphram, it makes me wonder why there was a mark on the center of the metal "hat" that the spring rides on.

I noticed the block plate had some kind of grease obviously to seal the plate and o-ring against the block...any idea what I should use to reseal it properly?

Also, what would someone have to do to disable the oil injection. They claim to have disabled it, but I don't see any physical evidence of it. I've heard that it's a good oil injection system, though I'm more worried about over oiling the fuel by premixing if the injection system is still operational...I need to know one way or the other.

I appreciate the checklist too, I'll definetely go through the steps.

 

[deejaycee_2000]

Re: fuel pump rod missing?

To see if the oil pump is disconnected, you will have to take off the oil pump, it is not so hard to do, if it is connected with a rod to the drive shaft then it is probably still functioning, if there is no rob it is disconnected .... mix your fuel 50:1, if you are over oiling, the motor would smoke alot ...

 

[redfury]

Re: fuel pump rod missing?

So does the pump have a rod that interconnects with a drive shaft off the crank, meaning there'll be the geared shaft still in the motor with an intermediary shaft connecting that to the pump itself?

 

[redfury]

Re: fuel pump rod missing?

Oh, and can anyone explain to me exactly how this pump works? I don't understand what would be the problem that would prompt someone to disconnect it in the first place....the only thing I've heard about oil injection is that it is imperative to use the correct oil designated for it, or you may have problems with clogging.

 

[deejaycee_2000]

Re: fuel pump rod missing?

Ok let me try and explain ... the oil pump is driven by a rod (a little gear shaft) that connects to the drive shaft (so the faster you go the faster the oil pump will work to supply oil) now this little rod (the little gear shaft) can disconnect easily, so if they disconnect your oil pump to use premix, they take out this rod (little gear shaft) that makes the oil pump work, so your oil pump will still be there connected, it will just not work .... the only reason I disconnected my oil injection on my suzuki's is for piece of mind .... if a engine sits for a long time, the oil goes gummy like and cloggs the system, normally after a major oil warning or breakdown, they will disconnect the fuel injection ..... and run it on premix ...