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Old 25 August 2008, 06:34   #11
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Originally Posted by Hightower View Post
My Oil priming bulb is rock-ard. By my reconing if there is no air in the system then why would the primer bulb be soft?

Not the same for the fuel line and no the bulb does not stay rock hard.

I just had a few problems myself this weekend with fuel delivery on a 1998 Yamaha 115 2-stroke. Both lower carbs had partially blocked jets with dirt in the float chambers even with an inline filter. I replaced all my fuel lines, took appart completely the carbs and fuel pump. Also I found a hairline crack in my fuel filter that pulled in some air. Now after everything was put back in place it started on a half turn and runs like a race horse.

I opted to not try and chase the problem but instead just go through the entire fuel system. In the end it took less time and pain than chasing the problems or guessing it.


Good luck
John
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Old 25 August 2008, 06:46   #12
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My Yammi and Merc always had a rock hard primer bulb and I never needed to prime it. Surely if there is no air in the system then the bulb will be hard and resistance felt.
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Old 25 August 2008, 08:37   #13
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I have the bulb between the tank and filter/seperator, should I try to move this to beween the filter and engine,
I have my primer bulb between the filter and the motor - the filter blurb said to do it that way, so may be worth changing it around.
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Old 25 August 2008, 12:59   #14
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I had a fuel problem on my last boat when the primer was before the filter. After moving it to sit between the filter and engine all was well. No idea the logic or reason though. I have also had a similar problem when some debris made it up as far as the inlet to the filter and partially blocked the opening. The suction from the engine caused the bulb to deflate as the fuel couldn't get through to replenish the bulb. Once cleared all was well. I wouldn;t think the bulb would stay firm when the engine is running as the fuel is being 'sucked' by the engine lift pump rather than being pumped up from the tank (as in a car).
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Old 25 August 2008, 14:29   #15
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I must admitt that I haven't a clue as to whether the bulb goes before or after the filter, but will definatly swap it around when I tinker with it later this week. The other thing I could think of was when I first tightened the fuel hose to the outlet pipe on the tank last year it deformed the copper pipe as I overtightened it. I did reform it by sticking a former up the inside of the pipe, but would be worth checking out again and doubling up on jubilie clips.

So who else has the pimer between the engine and the filter?
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Old 25 August 2008, 15:13   #16
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Oddly, my twins are rigged both ways, differently on each side. I await the outcome here with interest.
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Old 25 August 2008, 15:14   #17
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Quote:
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So who else has the pimer between the engine and the filter?
Mine was like this
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Old 25 August 2008, 17:27   #18
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Mine

Mine's between the filter and the engine.

Had a Tempo bulb that collapsed a few times causing the engine to stop - which was a little worrying on the way to the Scillies!

Replaced it with a genuine Quicksilver one for about 10 and all well for the last 3 years.

If you've net renewed the bulb then this would be a place to start.
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Old 25 August 2008, 18:11   #19
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A marine engineer advised me to fit the priming bulb should be situated between the filter and the engine. Reason he gave was that this reduced the possibility of forcing through any impurities/water into the engine. Makes sense to me.
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Old 25 August 2008, 19:20   #20
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Mine's between the filter and the engine.

Had a Tempo bulb that collapsed a few times causing the engine to stop - which was a little worrying on the way to the Scillies!

Replaced it with a genuine Quicksilver one for about 10 and all well for the last 3 years.

If you've net renewed the bulb then this would be a place to start.
Mine is a genuine BRP one and was installed new last year, I'm going to resite this to after the filter first.

Thanks!
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