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Old 22 January 2009, 04:32   #11
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Originally Posted by Dirk Diggler View Post
Common sense really, under normal use, the primer bulb is the only thing you'd need to access, hence the reason for these!
Nice ! I like those plastic fittings. (Zipping Anorak up)
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Old 22 January 2009, 04:34   #12
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10mm is good and more than enough for your application.

I would put the primer before the filter however I have had one after a filter and not had any problems.

The only thing I would make sure is the bulb is in a vertical position with the arrow up as they pump much better like that.
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Old 22 January 2009, 04:53   #13
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i will bow to everybody else's experience if they have fitted more of them than i have
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Old 22 January 2009, 05:07   #14
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On my old boat I had 2 plastic tanks, one at the bow, one at the stern with a permanent hose form the bow tank to the engine, theoy beingwhen one ran dry, I just swapped the connection from the "standard" across from tank to hose (or vice versa) at the engine, one line with primer by the engine.

Those bulbs, as everyone says, push well, but don't suck a lot (sure I could have phrased that better) but are also hopeless at shifting air. on the current setup, when I swap to / from the front tank, the primer goes at the tank end, and the fuel line from the front is long enough to reach the engine.- it means if I empty the long hose it's easier to refill it.

Or, in short, put it as close to the tank outlet as package / access space will allow so you can prime the priimer more easily!
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Old 22 January 2009, 05:27   #15
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primer bulbs dont push anymore air or fuel than they suck, it just seems that way with the pressure of you squeezing, what goes in must come out, same in, same out, only difference is you squeezing if you have proper quick release fittings on any tank or outboard it will shutoff and keep the fuel in the tube
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Old 22 January 2009, 06:13   #16
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I'm glad this has been brought up. The bulb is after the filter on mine and it seems to take for ever to get the bulb to go hard.
I'm re-doing the fuel lines soon so may try the bulb before.
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Old 22 January 2009, 06:29   #17
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Quote:
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primer bulbs dont push anymore air or fuel than they suck, it just seems that way with the pressure of you squeezing, what goes in must come out, same in, same out, only difference is you squeezing if you have proper quick release fittings on any tank or outboard it will shutoff and keep the fuel in the tube
yes but were talking pressure not volume.
primer bulbs dont suck well, they blow well. Like ANY pump.
even if they creates a high vacuum (which they certainly dont) they could only lift fuel a few 10s of feet.
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Old 22 January 2009, 06:31   #18
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jsp, there is a knack if the fuel backs to your tank that makes it quicker, as follows:- squeeze bulb, crimp tube, release bulb, release tube, and repeat, this creates a vacuum upflow of the bulb thus pulling it through quicker
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Old 22 January 2009, 06:36   #19
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jsp, there is a knack if the fuel backs to your tank that makes it quicker, as follows:- squeeze bulb, crimp tube, release bulb, release tube, and repeat, this creates a vacuum upflow of the bulb thus pulling it through quicker

Far better to move the bulb to before the filter which IMO and quit a few others is the right place for it
The other advantage as well as all the others i previously listed is you can pressurise the whole fuel system including the filter making it easier to find leaks.
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Old 22 January 2009, 06:47   #20
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i was one of the guys who rigged the boats for the camel trophy (60+) so give me your views doggypaddle, 3 built in tanks, cross over valves, filter, engine, primer bulb.
crossover by filter, would you put 3 bulbs before the filter or 1 near the engine
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