Bleeding fuel line

[Prospect and Sunray]

If your filter is anything like mine, I can't see how fuel emerges from the breather without first filling the filter, since the breather is at the uppermost point of the housing.
Seems very strange, and I would question how the filter has been re-assembled. Can't see how loosening the holding bolt would help.

Because filling any vessel with fluid will displace the air in it. If the filter is sealed then you will not get fuel in it as the air has nowhere to go. Cracking off the centre nut allows more air to escape so the filter should fill faster/easier. Sounds like the OP's filter assembly is correctly assembled as it is air tight.

 

[Graham_Wright]

I am puzzled as to why your toilet is connected to your exhaust Graham???

Don't have a macerator!

 

[earlybird]

Because filling any vessel with fluid will displace the air in it. If the filter is sealed then you will not get fuel in it as the air has nowhere to go. Cracking off the centre nut allows more air to escape so the filter should fill faster/easier. Sounds like the OP's filter assembly is correctly assembled as it is air tight.

But the filter housing isn't sealed and air-tight when the bleed screw is slackened. That's the whole point of it, to allow displaced air to escape from the uppermost point of the housing and allow liquid to fill the volume below.
If cracking the centre bolt makes any difference, then the bleed point isn't doing its job.

 

[YachtAllegro]

Does sound a bit odd. The last time I had trouble getting the primary filter to fill after changing it was because the level in the fuel tank had dropped below the level of the filter. Don't see how that would cause fuel to leak out of the bleed screw, but it certainly is worth making sure your tank's topped up before changing the filter.

Cheers
Patrick

 

[CaptainBob]

Does sound a bit odd. The last time I had trouble getting the primary filter to fill after changing it was because the level in the fuel tank had dropped below the level of the filter. Don't see how that would cause fuel to leak out of the bleed screw, but it certainly is worth making sure your tank's topped up before changing the filter.

Cheers
Patrick

Ah yes, that was why I put the priming bulb in between tank and first filter. It solves that problem too.

 

[Prospect and Sunray]

But the filter housing isn't sealed and air-tight when the bleed screw is slackened. That's the whole point of it, to allow displaced air to escape from the uppermost point of the housing and allow liquid to fill the volume below.
If cracking the centre bolt makes any difference, then the bleed point isn't doing its job.

Sorry EB, I was trying to say that the centre bold is bigger and in some cases the bleed nipple gets a bit of crud etc in it (or it's small and works slowly) so opening the centre "bigger" bolt allows faster priming sometimes.

 

[onenyala]

Sorry EB, I was trying to say that the centre bold is bigger and in some cases the bleed nipple gets a bit of crud etc in it (or it's small and works slowly) so opening the centre "bigger" bolt allows faster priming sometimes.

It is still a complete mystery to me. If the bleed nipple had crud in it then no fuel would come out of it.The problem was that the fuel was coming from the tank ( the fuel level of which must have been well above the filter as fuel was getting to the filterhead) then directly out of the bleed nipple????

 

[earlybird]

I think I'd try changing the filter element for a different one, and see if that makes a difference.