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Old 29 June 2011, 16:53   #1
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Fuel primer bulb before or after filter ?

Now when adding a larger tank on the SR, planning to install a OMC fule filter/water separator on the transom. My plan was to install in order: tank - primer bulb-filter/separator - engine. Or should I put the primer bulb after the filter? Any particular good spot on the transom where to place the filter on an SR 5.4?

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Old 29 June 2011, 17:00   #2
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I had problems once when the bulb was before the filter so have always fitted it after the filter since, and never had any further problem.
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Old 29 June 2011, 17:33   #3
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Before, make sure that you have enough hose to be able to orientate the bulb with the arrow vertically. Bulbs are designed to push fuel not pull, so they need to be as close to the tank as poss.
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Old 29 June 2011, 19:24   #4
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Quote:
Originally Posted by C-NUMB View Post
My plan was to install in order: tank - primer bulb-filter/separator - engine.

That's how my Humber was and I'm pretty sure it's how the Osprey is as well.
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Old 30 June 2011, 01:28   #5
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Thanks for the input. Maybe its not such a huge difference, but seams like majority install the bulb before the filter. Think will start that way, if will have issues then change it to after filter.
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Old 30 June 2011, 05:49   #6
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I can't see why it should make any difference once the system is bled up but I guess the main difference is that when you change the filter you're pushing fuel with the primer rather than sucking air which should make bleeding it easier, and also if you have it after the filter and are therefore sucking air from the filter you're still going to end up with all that air in the fuel line to the engine whereas if you're pushing fuel through and bleeding it out the top of the filter you should in theory be able to get more or less all of the air out. I know when I drained the filter on mine a few months ago, I bled the air out the bleed screw on top of the filter body and I don't reckon there was much if any left in the system, which wouldn't have been possible if the primer was after the filter. The engines must have some system to take air bubbles out at the engine end but I guess it's better if there is less in there to start with!

Lift pumps on automotive engines are usually before the filter, and the ones that aren't (Ford TDCi engine in new Defenders is the main one I can think of) are the ones that are a PITA if you get air in them.
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Old 30 June 2011, 08:16   #7
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Ribcraft fitted ours close to the engine, a long way from the tank and filter (in console)
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Old 01 July 2011, 03:49   #8
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I was always advised to fit the primer bulb after the filter. I've done on on two boats and never had a problem.
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Old 04 July 2011, 05:25   #9
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Quote:
Originally Posted by Simon B
Ribcraft fitted ours close to the engine, a long way from the tank and filter (in console)
Same here, the first thing I did was replace the 5/16" fuel line that they fitted with the correct 3/8"& move the primer bulbs to under the console. Next job was to get rid of all that s**t black spiral wrap & fit proper rigging hose, hey ho!!

ee lad, tha can't educate pork
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Old 04 July 2011, 16:27   #10
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We covered this before!!

Priming bulb before or after filter?

Not sure there is a right or wrong way but i prefer before, for several reasons which i posted in this thread.
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