Is my CAV filter plumbed the wrong way?

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shoc

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Hi there,

Is my CAV filter plumbed the wrong way? should it be plumbed 1 ->3 or 2 ->4 i.e. across the housing rather than in & out on the same side? Pics attached below

TIA




 
It’s fine. The four ports are to give you options in laying out the plumbing. You just need to ensure you don’t connect to two in arrows or two out arrows, since then the fuel wouldn’t be going through the filter.

Pete
 
What PRV said.

Mine is arranged the same as yours, if it's any additional reassurance:

rZbjrOC.jpg
 
earlybird said:
Made me smile. The first picture showing a super-safe mounting with lock-nuts on the bolts. 2nd. just a couple of pieces of bent wire.
Who's right?
Click to expand...
Those are not "pieces of bent wire" they are actually screw-in cup hooks, of the right-angled variety, and seem to be an intelligent response to the problem which I also have; that to change the filter element with the minimum amount of spillage, I need to remove the locating nuts, remove the housing from the bulkhead and raise it about 100mm.
 
Spirit (of Glenans) said:
Those are not "pieces of bent wire" they are actually screw-in cup hooks, of the right-angled variety, and seem to be an intelligent response to the problem which I also have; that to change the filter element with the minimum amount of spillage, I need to remove the locating nuts, remove the housing from the bulkhead and raise it about 100mm.
Click to expand...

Wrong spec. They should be plastic coated to avoid electrolytic corrosion with the filter head.

There's nothing intelligent about having bits of a fuel system rattling around like that . Same for electrics and gas - it should all be properly fixed.
 
Spirit (of Glenans) said:
Those are not "pieces of bent wire" they are actually screw-in cup hooks, of the right-angled variety …
Click to expand...

Rogershaw said:
It does make it easy to change the filter :)
Click to expand...

Exactly so, both of you.

The PO of my boat - a tiller-steered, fin-keeled 40'er he commissioned in the 90's - was a man of interesting and clear ideas when it came to boats.

I think when I replace the fuel filter housing (my "Dumb CAV filter question" thread) I may choose a separate water trap, in which case I think I'll put them together, side-by-side, on a backing board that can be lifted out for the same purpose. In that case I would make the mountings a bit more secure, but I'd guess it's been installed this way for over a decade, so not an immediate worry for me.
 
KompetentKrew said:
Exactly so, both of you.

The PO of my boat - a tiller-steered, fin-keeled 40'er he commissioned in the 90's - was a man of interesting and clear ideas when it came to boats.

I think when I replace the fuel filter housing (my "Dumb CAV filter question" thread) I may choose a separate water trap, in which case I think I'll put them together, side-by-side, on a backing board that can be lifted out for the same purpose. In that case I would make the mountings a bit more secure, but I'd guess it's been installed this way for over a decade, so not an immediate worry for me.
Click to expand...

To make the filter removable to ease filter changing easy. A cut off plastic milk container could be positioned to catch and fuel oil and the old element. Turning the head upside down to refit the new element and fitting/aligning the seals again makes it easy.

I plan to fit mine onto studs and hold the filter head in place with wingnuts.
 
Rogershaw said:
To make the filter removable to ease filter changing easy.
Click to expand...
It is also above the level of the bottom of the fuel tank in this position, but the previous owner advises that moving it helps bleed air from the fuel supply: "it is important that you bring the pre-filter below the tanklevel before you close the airvent on the filter. Otherwise you have an airbuble in the top of this filter which you cannot see."

Rogershaw said:
I plan to fit mine onto studs and hold the filter head in place with wingnuts.
Click to expand...
That sounds perfect! Thank you for the suggestion.
 
LittleSister said:
. . . so long as the line from the tank is the one that has the tap in it, not the line to the engine.
Click to expand...

True. It would be pretty silly for it not to be, since presumably the point of the valve is to shut off (gravity?) flow from the tank while you change the filter. But of course people do all sorts of odd things on their boats ;)

Pete
 
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