Filter Housing Thread Size?

[sir jasper]

Hi all,
I've a recently bought a yacht, and one of the many winter jobs is to fit a fuel isolation valve in this tight spot (currently no isolation valve):

For reference, the filter housing is attached via a plate to the stainless fuel tank, the fuel infeed is via the black pipe.
Anyone know the likely thread size of the in / out ports on this filter housing - I'm guessing 3/8, can anyone clarify?
Unsure of the model of filter housing, possibly volvo as there's a volvo penta 358 1078 filter attached.
With the very limited space, I'm thinking of fitting a valve directly on the housing with a stainless steel hexagon nipple - any other ideas?

 

[andsarkit]

That's a CAV/Delphi which can be either 1/2" UNF or M14x 1.5mm. Try ASAP-Supplies for parts.

 

[Daydream believer]

I put the stop valve immediately after the fuel tank.
Typical part Nos for alternative filters which are made by lots of suppliers . But these are those I get from Does. Perkins & Donaldson supply the filters as well , but I have misslaid the ref No.:-
They are cheaper from a commercial tractor/ garage supplier if you have one locally. Millions made so you can get them at lots of places
Do not pay Volvo prices

Water Trap Filter	83937061	New Holland Ref
	84535312	CNH Ref

 

[[70521]]

Gosh that is tight! I don't fancy changing the filter there.

Could you place the switch nearer the tank where there might be more space?

 

[Daydream believer]

Gosh that is tight! I don't fancy changing the filter there.

On mine, because the valve is next to the tank, I can isolate the filter. _ I think this is important if one gets a leak- Then I have jubilee clips connecting the hose to the filter & valve. On the other side I have along loop of hose. This means that I can shut the valve. disconnect the filter on one side, Unbolt the filter & lift it into the cabin space. Then I can change the filter over a bucket. This way I make sure that the filter & rings are all seated correctly. Then I replace the filter, Reconnect the hose. I have bellows in the long hose loop & use that to bleed the system.
In the odd times that I might get a leak ( the original was a clone, not a delphi & used to leak) I can turn off the fuel tap & investigate further. With the valve fitted to the filter I would not be able to remove it which would be a real pain.
In my view a bit dangerous if one does not have the valve fitted to the tank

 

[sir jasper]

On mine, because the valve is next to the tank, I can isolate the filter. _ I think this is important if one gets a leak- Then I have jubilee clips connecting the hose to the filter & valve. On the other side I have along loop of hose. This means that I can shut the valve. disconnect the filter on one side, Unbolt the filter & lift it into the cabin space. Then I can change the filter over a bucket. This way I make sure that the filter & rings are all seated correctly. Then I replace the filter, Reconnect the hose. I have bellows in the long hose loop & use that to bleed the system.
In the odd times that I might get a leak ( the original was a clone, not a delphi & used to leak) I can turn off the fuel tap & investigate further. With the valve fitted to the filter I would not be able to remove it which would be a real pain.
In my view a bit dangerous if one does not have the valve fitted to the tank

I like your idea of being able to remove and extract the filter housing; so new plan, the valve will be attached to the outfeed of the tank not the filter housing (space permitting).

 

[LittleSister]

I like your idea of being able to remove and extract the filter housing; so new plan, the valve will be attached to the outfeed of the tank not the filter housing (space permitting).

Consider moving the filter housing somewhere else entirely, perhaps?

A previous boat of mine had its CAV filter in an almost inaccessible location at full arms length in the dark in the bowels of the boat behind the engine (it had to be accessed lying upside down in the cockpit locker!) . I had it moved to in front of the engine (mounted on a new wooden upright bolted to the front of an engine bearer), where it couldn't have been more visible and accessible, and there was room to get a bowl or jug under the housing to catch the diesel, used filter and various seals etc. Can't imagine why it wasn't there in the first place.

Another alternative to disconnecting the filter housing to change the filter, is to have sufficiently long coiled tails on the hoses, so that you unbolt (better still unclip) the housing and lift it up without having to disconnect the hoses. I have a vague recollection of another forumite having his filter mounted housing on a small board/panel whi

 

[Laysula]

Or better still, dump the cav and fit a Racor 500 which are top loading and easy to change.

 

[PetiteFleur]

Or fit a spin on replacement filter head - very easy to change the filter.

 

[sir jasper]

Or better still, dump the cav and fit a Racor 500 which are top loading and easy to change.

That's a great suggestion

 

[Laysula]

If your filter is not gravity fed, then a squeezy bulb is worth fitting between the tank and filter which really does make filter changing easy.