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Posted

Hey guys,

I'm stuck! I have a Liverpool Boat from 2005 with an Isuzu Marine 35. I am so confused, I've been looking for the agglomerator for months, every now and again I go and take another look. It doesn't seem to be on the primary or secondary fuel filter and I can't see a tap or bolt that would be for this either. The filters are solid, no catch on the bottom.

Could someone possibly tell me what I am missing. I'm not great with engines and I'm scared to mess this up.

Cheers,

Jamie

Posted

Aha, thanks. I was beginning to wonder this. Is it something I would need to install before my next BSS or is this something that is just not needed?

Posted
8 minutes ago, mross said:

It's not a requirement.

But it's strongly advised. Not by BSS, by folks wot know engines. 

  • Greenie 1
Posted

Most boats just have two filters, and a few have only one.

I don't fully understand what agglomerators are sedimenters actually are. Any water or sediment should just fall to the bottom of the filter housing. I think some agglomerators try to spin the fuel to separate the water but at canal boat fuel flows they probably wouldn't do much more than a filter anyway.

A drain plug on the bottom of the filter would be useful to periodically drain a bit of fuel off to test for water. A glass bowl at the bottom of the filter would be even better but its hard to find one that meets the BSS spec.

I have drain screws on my filters but never use them. I suggest that you change the first filter quite often at first and empty the contents into a jar and inspect for water. Once you are happy that you have a clean water-free fuel tank then change the filters less often (every 600 hours?). Only problem would be a sudden and unexpected quantity of new water into the fuel tank.

I wonder how many boaters check their fuel filter for water daily, or weekly, or at all?

There are some very expensive water separating filters on the market if you really want one, plus one or two slightly expensive ones.

Dave

  • Greenie 1
Posted
3 hours ago, WotEver said:

But it's strongly advised. Not by BSS, by folks wot know engines. 

We don't have one

Richard

Posted

You all have agglomerators, all fuel filters agglomerate water droplets. Because of the BSS you may not have a drain plug on your filter (It has to be metal) but it will agglomerate.

Agglomerators do not spin fuel a such, the pores are too small for water droplets to get through until they agglomerate together and form a large enough drop so the fuel pressure on the outside area is such that the internal pressure overcomes surface tension and force the drop through the filer where, now its larger and heavier it drops to the bottom of the case.

The problem is, being a filter with small pores its fairly easy for dirt and a water to block it.

I would always fit a sedimentor between tank and lift pump. This is the one that spins fuel so larger  drops of water (about 80% of it) and larger particles of dirt  are spun to the outside and drops through a larger gap into the bowl/

Its a  three step process - keep tank clean and water free as possible, sediment it, then aggomerate it. This will minimise the chance of problems.

  • Greenie 1
Posted

There's also usually little filters in electric fuel pumps and also in mechanical lift pumps with a small sediment chamber.

  • Greenie 1

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