outboard issues

my 75hp mercury outboard wont start,i think it could be due to an airlock in the fuel line i prime it till the bulb goes hard, i can still see air in the fuel filter, when i release the pressure from the priming the bubble get bigger again like its under pressure. is there any way to bleed the lines? after trying to start it there isnt any fuel getting to the motor, cant smell any fuel like you do when a motor turns over for a while and dosent fire, plugs are dry, put new plug in it just to make sure.

any ideas??

I'm not very mechanical , but Only time I've had issues with motor not starting is water in the fuel . Had to drain carb and start back with fresh fuel , good to go ! . At the time it did appear that fuel wasn't getting through .

well now i see theres fuel leaking out the exhaust onto the ground, i take the plugs out, turn it over, put them back in, it fires once then dosent go again. seems to be primed properly.

You may have a faulty fuel pump?
I'm assuming you've checked to see your sparkplugs are sparking?

Feed the bitch on ether to see if it runs...work back from that.

fed it a can, no go still.

Problem is in the motor then (IMO)...if it wont run on that shit, it wont run on petrol...do you have compression?

Dry your plugs out. Dont prime but try and start on ether. If it runs try priming again. Your primer bulb may be at fault

Not up on the black motors.

Presumably there will be a small in line filter just inside the cowling. Check that is not blocked.
Remove all plugs and check for spark on each.
without a compresson tester all you can do is hold your thumb firmly on the plug holes as its wound over, they should all blow and suck.

remove all carb float bowls and check for water/crud in the bottom.
with bowls off blow threw fuel feed and check air flows into bowl area and that it shuts off when float is lifted.
DONT BEND ANY THING RELATED TO FLOAT HIGHT.

If possible remove outlet from fuel pump and check it is pumping.

Check the fittings on your tank and primer bulb for sealing/Shit etc.

You have your hose hooked up the right way and are not trying to suck fuel out of the motor and pump it into the tank?

If it has air,spark,compression, and fuel it should go.

If fuel is literally running out the exhaust but your plugs are not wet this is very odd!?

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Originally Posted by 7mmwsm

Take it about 400 meters off shore, undo the bolts and "set her free".
Then go buy a Yamaha.

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always good advice.


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At least the Suzuki will dissolve without trace!:thumbsup:

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Originally Posted by 7mmwsm

Take it about 400 meters off shore, undo the bolts and "set her free".
Then go buy a Suzuki.

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come paddle the boat for me

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Originally Posted by veitnamcam

Not up on the black motors.

Presumably there will be a small in line filter just inside the cowling. Check that is not blocked.
Remove all plugs and check for spark on each.
without a compresson tester all you can do is hold your thumb firmly on the plug holes as its wound over, they should all blow and suck.

remove all carb float bowls and check for water/crud in the bottom.
with bowls off blow threw fuel feed and check air flows into bowl area and that it shuts off when float is lifted.
DONT BEND ANY THING RELATED TO FLOAT HIGHT.

If possible remove outlet from fuel pump and check it is pumping.

Check the fittings on your tank and primer bulb for sealing/Shit etc.

You have your hose hooked up the right way and are not trying to suck fuel out of the motor and pump it into the tank?

If it has air,spark,compression, and fuel it should go.

If fuel is literally running out the exhaust but your plugs are not wet this is very odd!?

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ill have another go in the morning and check all the, but its strange that it was going mint a week ago.

Pump diaphragm ?

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Originally Posted by Maca49

Pump diaphragm ?

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I had that in my yammie, Never stopped and would start but the fuel was pouring out the exhaust at cruise. Went from 1.4km per/l to 3km p/l so knew something was wrong. Had the dogey one replaced and the other ones too as a precaution and now all good, touch wood

There ha go Yammy and Merc! Says it all:thumbsup: Suzuki disprins don't count :thumbsup:

still got me fucked, might strip it out completely over the weekend and give it a birthday, since the weathers turned to shit now i wont feel as bad wasteing a weekend haha

Gotta be pump, my JOHNSON screwed up $700 for a new one, mine was the over supply of oil! But coming out the exhaust must be pumping straight thru?

Give it a bit of " start ya bastard( no shit its actually called that)" in the sparkplug hole and carby. Pure etha that'll get her humming then quickly chuck it on trademe as mint condish and buy a yamaha

From black to a deep hole:thumbsup:

You probily sorted it but it's now fucked because you put a can of shit down the poor things throat

Seems strange that you pumped out the cylinders abit then it started for abit
Pull plugs check for spark
If in doubt replace plugs, they may work ok with no load but when they get compression on them they will faulter, drain all the carb bowls,
Disconnect fuel, and with bowls drained crank her over with no plugs to get all the shit in the cylinders out, check for suck/pull with plugs out while you're there, put the new plugs in, don't over prime it then give it ago, stay away from the either - engines become reliant on it, it also has no lubricating property's for 2-strokes - unless it states it does on the can

There's more shit to check after that

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Quote:

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Originally Posted by Smiddy

You probily sorted it but it's now fucked because you put a can of shit down the poor things throat

Seems strange that you pumped out the cylinders abit then it started for abit
Pull plugs check for spark
If in doubt replace plugs, they may work ok with no load but when they get compression on them they will faulter, drain all the carb bowls,
Disconnect fuel, and with bowls drained crank her over with no plugs to get all the shit in the cylinders out, check for suck/pull with plugs out while you're there, put the new plugs in, don't over prime it then give it ago, stay away from the either - engines become reliant on it, it also has no lubricating property's for 2-strokes - unless it states it does on the can

There's more shit to check after that

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I wasn't meaning to run the motor on eather just get her firing. I race karts and thats exactly what we use when it doesn't crank up.

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Originally Posted by Maca49

Gotta be pump, my JOHNSON screwed up $700 for a new one, mine was the over supply of oil! But coming out the exhaust must be pumping straight thru?

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yeah its like its getting fuel/oil cus its dripping out. ill check spark etc tommorrow its about the only thing i can think of now. cant find a manual on the bloody thing either so thats not helping. still fires once if i leave it for a half hour or so. might need a visit to the outboard doctor.

Quote:

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Originally Posted by Smiddy

You probily sorted it but it's now fucked because you put a can of shit down the poor things throat

Seems strange that you pumped out the cylinders abit then it started for abit
Pull plugs check for spark
If in doubt replace plugs, they may work ok with no load but when they get compression on them they will faulter, drain all the carb bowls,
Disconnect fuel, and with bowls drained crank her over with no plugs to get all the shit in the cylinders out, check for suck/pull with plugs out while you're there, put the new plugs in, don't over prime it then give it ago, stay away from the either - engines become reliant on it, it also has no lubricating property's for 2-strokes - unless it states it does on the can

There's more shit to check after that

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it never fired on the few squirts of engine start i gave it. ill try draining it out and letting it dry up then re priming it. the plugs are brand new aswell.

Never owned anything else bur Evinrude or Johnson, never had any probs in 30 yrs of owning. Of course there gone now, the motor I have is a 1997 vee 4 last of the big looper motors, owned since 2000. Great motor, guess if I bought a new one these days I'd have to consider my options very carefully!

Sounds like the fuel pump to me. I have a Johnson on one of my boats and that was exactly the issue I had with it. So I put on a new fuel pump not a VRO one and now mix my gas in the tank. have had no more issues and it goes like a dream. On the other boat I have a 1154 Yamaha , it has never let me down.

so after leaving it for a day or 2, the bloody thing fired up first try today....? ill go give it a kane up the river to clear it out and hopefully thats the last time it decides to do that. im thinking i may have flooded it...or something along those lines.

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Originally Posted by silentscope

so after leaving it for a day or 2, the bloody thing fired up first try today....? ill go give it a kane up the river to clear it out and hopefully thats the last time it decides to do that. im thinking i may have flooded it...or something along those lines.

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Hmmm, no report yet. Still paddling?

I had a similar problem with my little tidller. Turned out to be the seal on the motor fuel connector. A right pain when having my fist crack with an outboard in a blustery nor-easterly. Thank goodness for those more reliable paddles. :thumbsup:

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Originally Posted by gadgetman

Hmmm, no report yet. Still paddling?

I had a similar problem with my little tidller. Turned out to be the seal on the motor fuel connector. A right pain when having my fist crack with an outboard in a blustery nor-easterly. Thank goodness for those more reliable paddles. :thumbsup:

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haha ill be making sure that its not going to happen again before i hit the sea. gonna book it into the boat doctor for a check and tune just to be sure.

If it goes now it must have either had a intermittent electrical fault(scary) or the plugs were actually wet with fuel and you flooded it.
A simple check for spark would have told you.

If flooded disconnect fuel and remove all plugs, wind briefly at full throttle no choke, let it rest a few minutes and another brief wind checking plugs are dry and spark then refit and start.

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Originally Posted by hamsav

Sounds like it has a crank case full of fuel to me ( assuming its a 2/ ) just the way you say it fires once after drying the plugs and the fuel dribbling out the exhaust . If it is a twoie remove the spark plugs ( and ground them ) , make sure the choke is off , open the throttle and crank her over , if there is fuel spraying out the plug holes your onto it . CAUTION ....if it is spraying fuel out ..... give some thought as to just where you ground the plugs as I have seen ( more than once ) said spraying fuel spraying straight onto the grounded plugs ...... which is why you keep the fire extinguisher handy. If you lean on the primer bulb to hard it is possible to "overpower " the float valves and massively flood the engine ..........
and just to kick the discussion on a bit ..... I had a late model ( white ) 70 horse Johnson , when we traded it for a new 90aeto Yam ..... well it did everything better with the jonny , went faster , jumped out of the water quicker ..........now if I could have stopped it melting the odd piston I would have kept it , I did actually get it sorted but by then the Mrs had got sick of things blowing up in the middle of the ocean ( everywhere is the middle of the ocean when you cant swim and don't like waves ):)

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that actually sounds like it could be the case, i primed it hard when i go and start it, maybe i shouldnt next time. got it started and it ran a bit rough, gave it a blast for a couple seconds and it seems to be alright now. still a bit rough on idle but maybe its still clearing as i havent run it in water yet.