Throttle

[zenoahphobic]

I am starting the think Zeno is a *****

A subjective term.

You may have missed my green dot, so I am sorry that you feel I do not contribute legitimately to this forum, or that I have crossed some unwritten brotherhood "do not question" code.

Just being analytical with robust discussion with predominantly someone who is also very analytical. I am sorry for thinking too laterally and teasing out a lengthy (?) debate.

Read Forum rules.

[99yam40]

I am starting the think Zeno is a *****

[zenoahphobic]

Now where is that light switch?

Ask boats.net directly, as he did not prescribe vertical positioning in your latest. Ain't seen enough convincing evidence to date. Anyone?

[zenoahphobic]

http://www.yamahaoutboardparts.com/f...lb-th9809.html

https://www.youtube.com/watch?v=IPsqPnFkhAg

A "primer" on fuel line primer bulbs....OB's - FiberGlassics® Forums - fiberglassics.com

Primer Bulb....2009 250 PRO XS

A "primer" on fuel line primer bulbs....OB's [Archive] - Scream And Fly Powerboat and High Performance Powerboating Discussion Forums

A "primer" on fuel line primer bulbs....OB's - XPOB - High Performance Boating and Related Discussion Forums

Good you have supplied some evidence granted, that is what I asked.

But some of the references have been duplicated. "post many times the same thing in different forums and the sum of these postings is greater than any alternative, therefore it must be truer trap" we call that branch stacking here in politics.

The video is good example to actually show something working, however (putting on my devil's advocate hat) , hopelessly inadequate! Do something like this, do it properly!

Why did not the video man demonstrate the primer not working sideways with liquid (maybe not with gasoline but water perhaps)?. Demonstrate the problem that he is telling us a solution for?.

Then show us it pumping better vertically with liquid!. Simple (and necessary) to proving of a point. (this how magicians fool people). Dah, should I be sucked in by the quality of the video and the man's convincing voice?

The devil's advocate has learnt that it pumps air (atleast I here the noise).

What I have learnt is that it seems that in more modern times atleast one primer bulb is fussy (perhaps) how it is orientated (like to see a video though); and this was never ever a problem for decades with primer bulbs before.

[boscoe99]

http://www.yamahaoutboardparts.com/f...lb-th9809.html

https://www.youtube.com/watch?v=IPsqPnFkhAg

http://www.fiberglassics.com/glassic...mer-bulbs-ob-s

http://www.bbcboards.net/mercury-3-l...50-pro-xs.html

http://www.screamandfly.com/archive/.../t-298611.html

http://www.extremeperformanceoutboar...mer-bulbs-ob-s

[TownsendsFJR1300]

Seahorse, Very good!!!

[zenoahphobic]

A seahorse.

Yes we now know all the options.

[TownsendsFJR1300]

Well, I think that horse has been beaten to death several times... Poor horsey..

I'm not changing mine from horizontal BUT will put it vertical If there's an issue pumping..

[zenoahphobic]

Now where's that light switch? Ah here it is, switch on, oh it is 240volts that makes my light very bright. Must pretty dim lighting using only 110volts over there!

[zenoahphobic]

I'll no doubt get many future "ah ha" moments from Boscoe, that is why I participate in this forum. But not on this one.

I brought up this subject as an example to demonstrate the pitfalls when discussions start to deteriorate when people start to go for the man and not the ball. Not sticking to the merits of the argument.

Retread postings, I clearly pointed out lack of relevant evidence, only implied evidence with contradiction was the only thing forthcoming.

"Trust me" without demonstration can only go so far.

The primer bulb is a vital piece of equipment and misunderstood, and is central to many questions on this forum.

If you are using what you perceive to be their view, look at the older Southwind boats, made by Yamaha and packaged with their engines, all I have seen with horizontal mounting of bulbs.

[TownsendsFJR1300]

The kicker is, once its primed, it doesn't matter.

If I have an issue priming a dry filter, I'll simply turn the bulb upwards as mine is currently horizontal..

Interesting thread for a very simple fuel part..

[boscoe99]

I'm getting the pop corn!!

No problem. I have been where he is before.

I am trying to get that light to turn on so he will have his "ah ha" moment.

[TownsendsFJR1300]

I'm getting the pop corn!!

[zenoahphobic]

So "something is said often enough by experts so it must be true. Don't worry if it can't meet the evidence test"

IMO primer bulbs should be placed as low as possible and horizontal to utilise gravity for fuel to flow into the bulb, and to overcome poor pump sucking ability, and to offer the least resistance to fuel flow.

[zenoahphobic]

Indeed no argument about trying different orientations - good advice.

But.

Your reference reading Tony Hughes, and I quote:

"when the engine is running its fuel pump produces a suction that draws fuel past the check valve. The valves are designed so that even the modest pressure of the engine fuel pump will draw fuel past them. At idle speeds some engine fuel pumps may produce marginal pressure and may not draw fuel past the check valves"

this was written before his Installation and before his Orientation paragraph where he says "it is also advantageous during priming it can be orientated vertically",

justifying this with: "if orientated downwards, gravity and the weight of the fuel in the line above the inlet check valve may spoil its operation, and the primer will not work properly".

If you use this argument it follows: if the bulb is mounted vertically, those same gravity forces from the weight of the fuel will press down on the check valve offering greater resistance to fuel flow , that somewhat counters Boscoes reference to Yamahas paranoia .....designed check valves that have very slight pressure to position them closed.

Thus the above argument does not address the need for the suggested vertical orientation for: minimal resistance to fuel flow when the check valve is OPEN

And therefore this is an argument supporting downward orientation.

Missouri indeed.