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Old 22 January 2009, 07:03   #21
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well i would do neither
I would put one primer bulb before the filter. and after the changeover valves. and keep the pipework from the tanks as low and short as possible and keep the filter and primer bulb below the level of the top of the fuel tank.
Three primer bulbs would work of course but its a bit unnessecary.
what i would not do is put the primer bulb after any filter other than the strainer in the tank, or at a height where its much higher than the top of the tank. its asking for an airlock thats a bugger to shift.
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Old 22 January 2009, 07:12   #22
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The more i think about it the more obvious it becomes

pre made fuel hoses have 6" hose on the suck side and 2feet on the pressure side,
All motor vehicles have (excepting agglomerators and coarse strainers) filters after pumps not before, and fuel pumps as low down as possible, usually in the tank.


EDIT
i looked as some hoses i have and some have long suck lines and short pressure lines!
looking on the net though general recomendation is primers mounted vertically arrow up, downstream of filters and near tank height.
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Old 22 January 2009, 07:38   #23
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I agree with Dirk...............and that's what it says in the manual too.
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Old 22 January 2009, 07:51   #24
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In reality if the filter is just a water trap it makes bugger all difference if its before or after the bulb, my SR was Rigged by the admiralty shipyard and they put the filter AFTER the bulb on the transom low down,

An old mercury manual i have shows the filter AFTER the bulb too. You have a manual that shows it before

I still maintain that in an emergengy with a partly blocked filter you can force fuel through it with the primer bulb to get you out of trouble if its before the filter,
conversley you can use the bulb as an indicator of a blockage if its the other way around it will start to collapse on WOT before it causes a problem..........

RACOR SAY....."The primer bulb can be on either side of the filter, but before the filter makes it easier to fill and prime."
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Old 22 January 2009, 08:15   #25
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Quote:
Originally Posted by doggypaddle View Post
..RACOR SAY....."The primer bulb can be on either side of the filter, but before the filter makes it easier to fill and prime."
That's interesting, 'cos it was the RACOR manual which stipulated the bulb should be after the filter
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Old 22 January 2009, 08:34   #26
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thankyou downhilldai, separ filters the same, we could argue till the cows come home, but i'm not going to, got a picture somewhere of two of these bulbs stuck on my tits, hows that done if they dont create vacuum
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Old 22 January 2009, 08:37   #27
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Originally Posted by biffer View Post
...got a picture somewhere of two of these bulbs stuck on my tits,...
To much information.
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Old 22 January 2009, 08:37   #28
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[quote=Downhilldai;279414] That's interesting, 'cos it was the RACOR manual which stipulated the bulb should be after the filter [/quote

RACOR cant make up their mind either, or the website i got that info from is wrong, but it can't be it was on T'internet so it must be right

heres the definitive answer......

"Install the filter somewhere in the fuel line with the flow in the direction of the arrow"
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Old 22 January 2009, 08:39   #29
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same as that
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Old 22 January 2009, 08:39   #30
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I refer you back to first sentence, post number 2.

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