Broke down at sea fuel problem bukh dv20

Rhylsailer99

Rhylsailer99

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Had a nightmare yesterday managed to get going by bypassing the main fuel filter. Strange as it's brand new and I cleaned the tank and put fresh diesel in . Before hand I Bled the system and it ran fine on the mooring . When I press the lift pump I can hear a noise at the filter , can there be problems with the sealing of these units.
 
Rhylsailer99 said:
Had a nightmare yesterday managed to get going by bypassing the main fuel filter. Strange as it's brand new and I cleaned the tank and put fresh diesel in . Before hand I Bled the system and it ran fine on the mooring . When I press the lift pump I can hear a noise at the filter , can there be problems with the sealing of these units.
Click to expand...

If it's a CAV 296 then yes.
 
Rhylsailer99 said:
Had a nightmare yesterday managed to get going by bypassing the main fuel filter. Strange as it's brand new and I cleaned the tank and put fresh diesel in . Before hand I Bled the system and it ran fine on the mooring . When I press the lift pump I can hear a noise at the filter , can there be problems with the sealing of these units.
Click to expand...
It ran fine this morning on fast tickover but I have a feeling when under power i
 
Caer Urfa said:
Sounds as if the rubber seal is not sitting correct and they are notorious for not sealing, great filter when they work but in the end I got fed up with problems and changed it back to a spin on type which sealed every time
Click to expand...

Completely agree. Many posts over the years about people having problems with CAVs and most were in nice calm berths at the time. After I had to change one at sea on a previous boat, I decided I didn't like to be head down with hot engine and diesel stink in a lumpy sea. Installed a spin-on afterwards and would not have a CAV on another boat.
 
I also fitted the spin on filter - so much easier and cleaner. A firm in Scotland supplies an identical head casting so you don't have to change the UNF fittings if fitted (newer CAV have metric threads)
 
When stressed, it's far too easy to swap the O rings on a CAV filter, which guarantees leaks, both fuel out and air in.

I binned mine and fitted a pair of spin-on filters from a car breaker in parallel, with taps to make switching a matter of seconds.
 
I had trouble with mine for several years & i was quite upset when my cousin called me a "spanner monkey". he works on a number of farms & as he pointed out, there are thousands of them out there in the real world. He has often had to replace a filter on a digger up to the tracks in thick mud.He never gets problems, stating how easy they are to replace if done properly.

He then made a comment which I followed up & I found that Hanse had fitted a clone & not a proper CAV ( Now Delphi)
I never have any more problems once I changed it for the genuine article. One thing he did tell me was not to over tighten it.

I did one further adaption & that was to fit studs to the bulkhead & then mount the filter on these so it could be removed very quickly by releasing 2 nuts. ( I lost the butterfly nuts I started with!!!)
I lengthened the fuel line so now I can release the filter, lift it over a bucket, change it, Bleed it ( I have bellows in the line) & then put it back. The job is fairly quick. I can sit on the end of the bunk to do it, not stand on my head, so access is less of an issue at sea.
 
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