How to fit a rubber bulb primer into a metal fuel line?

pandos said:
Why not go with a facet 12v inline pump very good and easy for priming....
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Does a facet pump allow free flow when not powered (i.e. can it be used solely to prime, and be normally left left switched off )?

How do facet pumps work (and where does the name come from)? I've often seen the name, but never known how they work, and found nothing informative with a quick search online.
 
LittleSister said:
Does a facet pump allow free flow when not powered (i.e. can it be used solely to prime, and be normally left left switched off )?

How do facet pumps work (and where does the name come from)? I've often seen the name, but never known how they work, and found nothing informative with a quick search online.
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Just Google facet 12v fuel pump.

I got mine a few years ago.
It does not affect things when not switched on.

It looks like this.
Screenshot_20200530-232511.png
 
LittleSister said:
I know what they look like! I asked how they worked (and what the name comes from).




Thanks. (y)
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They work by the magic of 12v is all that worries me .

Mine is posiflow which I understand has desirable qualities in a boat.. (plastic body) it looks like the photo... But not like others, (you obviously could not know what mine looked like)

1976: FACET Enterprises is born. FACET is an acronym for Filters, Automotive Components, and Environmental Technology.

Google is truly your friend here..
 
pvb said:
Really? On what basis do you claim that? Loads and loads of boats have rubber fuel lines. Are you suggesting they're all uninsured?
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I am not suggesting anything, or trying to put words into other mouths.
What I am saying is non marine approved (ISO7480 I think) rubber fuel lines/bulb COULD cause issues in a fire claim.

Iirc petrol boats were even fussier, no plastic fuel filter drain taps/screws, no glass bowls.
 
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PaulRainbow said:
There is no requirement on a boat to have all metal fuel lines, if there was, just about every modern production boat would be in breach of it.

There is also no need to mount fuel primer bulbs in an particular orientation. If there is, someone should contact a few of the major car companies that have fitted them, usually horizontally.

As for it being a bodge, again, someone should contact a few of the major car companies that have fitted them.

it isn't a bodge and should one fail, nothing happens, it just doesn't prime. I've known several of the ones on top of CAV filter heads to fail due to a leaking diaphragm, that mode of failure means air gets into the system, which can be a real pain to pinpoint.
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I could be wrong here, but most boats I have seen have the majority of their fuel lines run in metal of one sort or another, and only a very short section of rubber at the engine end?

Do you really think cars and boats compare on any level?
 
PaulRainbow said:
There is no requirement on a boat to have all metal fuel lines, if there was, just about every modern production boat would be in breach of it.

There is also no need to mount fuel primer bulbs in an particular orientation. If there is, someone should contact a few of the major car companies that have fitted them, usually horizontally.

As for it being a bodge, again, someone should contact a few of the major car companies that have fitted them.

it isn't a bodge and should one fail, nothing happens, it just doesn't prime. I've known several of the ones on top of CAV filter heads to fail due to a leaking diaphragm, that mode of failure means air gets into the system, which can be a real pain to pinpoint.
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But able to be primed in a vertical mode.
 
lynallbel said:
I could be wrong here, but most boats I have seen have the majority of their fuel lines run in metal of one sort or another, and only a very short section of rubber at the engine end?

Do you really think cars and boats compare on any level?
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Of course they do. Do you really think an engine needs some sort of magical marine version of priming the fuel system ?
 
PaulRainbow said:
It's a rubber bulb, it will prime the fuel system perfectly OK if it is mounted horizontally. Why wouldn't it ?
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Yes it will, but its easier to get all the vapour/air out of the bulb if held vertically.
Think of miking a cow, which way do the teats work best, vertical or horizontal?
 
With a priming bulb horizontal it is possible for air to be trapped in the top part of the bulb.

With a petrol engine it not an issue if any air travels along from the priming bulb to the engine but with a diesel engine as we all know air in the fuel line to engine could cause the engine to stop.

This is why it's better to have the priming bulb to be vertical with the outlet upwards to reduce the possibility of air being trapped inside the bulb.
 
Rogershaw said:
With a priming bulb horizontal it is possible for air to be trapped in the top part of the bulb.

With a petrol engine it not an issue if any air travels along from the priming bulb to the engine but with a diesel engine as we all know air in the fuel line to engine could cause the engine to stop.

This is why it's better to have the priming bulb to be vertical with the outlet upwards to reduce the possibility of air being trapped inside the bulb.
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I don't argue with the logic of that .... but in fact air in upper part of bulb will NOT be a problem as long as the inlet and outlet pipes of the bulb are well covered by fuel in the bulb.
The diesel will draw fuel ... the level drops in the bulb causing a partial vacuum and fuel will draw from tank. Unless the air bubble in the bulb is substantial - it will never be at level of outlet to then put air into the line.
The act of priming if done correctly should minimise such air to a level that its just no concern.
 
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