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Old 09 May 2015, 09:36   #1
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Yam 30 Fuel Problems

I bought a new fuel line for my Yamaha 30 as the old one was perished and we had some problems when we went out for the first time. I fitted it on Tuesday and it primed well and the bulb went solid, however I've just tried to run the engine but it was stubborn to start (which is unusual as this engine usually starts on the 1st or 2nd pull) and it would die after 10 or so seconds. One thing I noticed is also the fuel bulb went completely flat when I primed it. It would also seem to suck the fuel out of the filter when priming.

I took the connector off and put both ends into the fuel tank, pumped fuel fine!

Not sure what is wrong, and couldn't even get the fuel filter out as it wouldn't unscrew.. any ideas?
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Old 09 May 2015, 11:09   #2
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Check the fuel connection on the engine. The male connector can cause issues. Check the ball-bearing isn't seized. Also check the fuel filter on the engine. Should be straight forward to unscrew. Finally, the primer bulb (if not new) is worth replacing. Just like the fuel hose they deteriorate with age. Quicksilver ones are the best.
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Old 09 May 2015, 11:35   #3
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Was tank vent fully open? Only asking as I had similar problem with. 55 hp.
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Old 09 May 2015, 13:59   #4
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I've had the inner liner on cheap fuel line completely separate and collapse on me.
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Old 09 May 2015, 14:05   #5
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Quote:
Originally Posted by spartacus View Post
Check the fuel connection on the engine. The male connector can cause issues. Check the ball-bearing isn't seized. Also check the fuel filter on the engine. Should be straight forward to unscrew. Finally, the primer bulb (if not new) is worth replacing. Just like the fuel hose they deteriorate with age. Quicksilver ones are the best.
The entire fuel line is brand new, and I tried to unscrew it but it wouldn't budge :/

The tent vent was fully open and I even took the filler cap off as well but it made no difference, could it be a faulty fuel bulb? I'm fairly sure that it is not a problem with the engine side of things however I will still look at the fuel filter and replace if I can't unscrew it.
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Old 09 May 2015, 14:11   #6
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Are the lines directional.
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Old 09 May 2015, 14:15   #7
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Are the lines directional.
The fuel line to the engine is and is the correct way round, arrow on the bulb going to the engine
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Old 09 May 2015, 14:42   #8
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Is it possible to bypass the filter to eliminate it from the problem?
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Old 09 May 2015, 15:29   #9
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Is it possible to bypass the filter to eliminate it from the problem?
May be able to, I will give it a go and see what happens
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Old 10 May 2015, 01:14   #10
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Personally I would bin the tank and the fuel line. Those cheap Italian tanks are pretty useless, the fuel pickup pipes alway end up unscrewing or leaking. Cheap primer bulbs can have faulty valves.

Sceptre Canada make the best tanks, they produce them for Yamaha, quicksilver and Suzuki as OEM. They are more than double the price of a cheap tank but well worth it. Yamaha complete fuel lines are good with the best connectors, stainless crimps etc but as said before the quicksilver primer bulb is very good too.
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Old 10 May 2015, 02:34   #11
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Would the bulb going flat mean the fault is at the tank end of the fuel system (blocked fuel pick up)?
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Old 10 May 2015, 03:08   #12
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A quick test would be to use a pipe without a bulb. Lift the tank above the engine with the vent open and gravity feed it. If it runs fine your new bulb is dodgy. Some of these aftermarket ones are not very good.
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Old 10 May 2015, 03:22   #13
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Personally I would bin the tank and the fuel line. Those cheap Italian tanks are pretty useless, the fuel pickup pipes alway end up unscrewing or leaking. Cheap primer bulbs can have faulty valves.

Sceptre Canada make the best tanks, they produce them for Yamaha, quicksilver and Suzuki as OEM. They are more than double the price of a cheap tank but well worth it. Yamaha complete fuel lines are good with the best connectors, stainless crimps etc but as said before the quicksilver primer bulb is very good too.
The tank is also pretty much brand new, has only been used once on a trip and sadly I don't have the money to get a new tank, so will have to stick with this one. I do however have a sceptre bulb and old line laying around that works, but the liner of the fuel line has come away so isn't much good.
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Old 10 May 2015, 03:45   #14
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Yamaha outboard motor fuel tank | eBay

Can't under-estimate the issues an aftermarket fuel tank and hose can cause. Yamaha kit is exceptionally well made. Trust me you don't want a collapsing fuel primer bulb on land, never mind at sea. You could get the Yamaha connectors, Quicksliver primer bulb and 3/8" fuel hose and use stainless steel jubilee clips. Would work out slightly cheaper.
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Old 10 May 2015, 04:25   #15
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Yamaha outboard motor fuel tank | eBay

Can't under-estimate the issues an aftermarket fuel tank and hose can cause. Yamaha kit is exceptionally well made. Trust me you don't want a collapsing fuel primer bulb on land, never mind at sea. You could get the Yamaha connectors, Quicksliver primer bulb and 3/8" fuel hose and use stainless steel jubilee clips. Would work out slightly cheaper.
I do have a quicksilver tank that I could dig out, however it's fuel of premix fuel so would have to swap that, again! I shall try and get the current set up working before I go about changing fuel between fuel tanks etc
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Old 11 May 2015, 00:47   #16
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If the fuel bulb is made by Tempo, toss that as well. The one I got for my Honda 40 wouldn't even suck air through a hose.

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Old 13 May 2015, 13:47   #17
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All sorted! Faulty fuel line, received a replacement today (of better quality as well) from pacermarine which is brilliant! Will be checking the fuel filter and emptying any debris from that and hopefully that should be everything sorted
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Old 13 May 2015, 13:58   #18
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Good to hear..
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Old 13 May 2015, 16:08   #19
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Good news.
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Old 16 May 2015, 09:06   #20
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Ran her up again today, or at least tried to! The new fuel line hasn't changed anything. Cleaned out the fuel filter as well. So I took the airbox off the carbs and found a pool of oily fuel, about 40ml or so that spilled out.. it's evident that it has come out from the front of the bottom carb, not the float bowl, is this a sign of a more serious problem?
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