Graham376
Well-Known Member
Every boat I've owned has had copper fuel pipes from new, including current one which has been fine for 33 years so, it doesn't seem to be a problem.
Connecting 5mm fuel hose (2mm id) to a CAV filter head
- Thread starter webcraft
- Start date
Every boat I've owned has had copper fuel pipes from new, including current one which has been fine for 33 years so, it doesn't seem to be a problem.
webcraft
Well-Known Member
Yes, but it is way back at the tank. Will it just not leak if I shut the tap? Presume it is the fact that a leak would cause a vacuum.
- W
Mister E
Well-Known Member
With the engine running would the supply to the heater be subject to some sort of pressure problem with the heater running?
NorthUp
Well-Known Member
Visit a car mechanic- brake pipe is a copper alloy (cunifer?) and can be flared and easily joined with proper threaded fittings. The final join to the heater fuel pump can be made with a short rubber hose over the outside of the pipe and the heater stub.
Buy yourself a decent fuel filter too- those cav units are from the 1950s and are nothing but trouble waiting for a lee shore!
Buy yourself a decent fuel filter too- those cav units are from the 1950s and are nothing but trouble waiting for a lee shore!
webcraft
Well-Known Member
webcraft
Well-Known Member
according to a couple of old threads on the subject quite a few people have had this set-up for years with no issues.
- W
Pye_End
Well-Known Member
Biodiesel less prevalent 33 years ago.
scottie
Well-Known Member
As I understand it’s not recommended to do it as it can introduce air into the fuel system
the filter head is not meant to be used that way
it should be taken directly from the tank
some people will say it’s ok but your the one that will have to live with lack of fuel for your engine but don’t worry as they will be there to get you out the sticky stuff
the filter head is not meant to be used that way
it should be taken directly from the tank
some people will say it’s ok but your the one that will have to live with lack of fuel for your engine but don’t worry as they will be there to get you out the sticky stuff
fredrussell
Well-Known Member
Drill and tap filter outlet blanking plate for this fitting:
1/8
…then join plastic fuel pipe to barb using a silicon tubing sleeve with 2 or 3mm ID such as this:
Silicone Fuel Tubing 2.3mm I/D 1.6mm Wall - RC Nitro Fuel Line Tube
1/8
…then join plastic fuel pipe to barb using a silicon tubing sleeve with 2 or 3mm ID such as this:
Silicone Fuel Tubing 2.3mm I/D 1.6mm Wall - RC Nitro Fuel Line Tube
webcraft
Well-Known Member
webcraft
Well-Known Member
Graham376
Well-Known Member
If ever you have to change a CAV filter in lumpy sea, with your head down inside a hot engine bay smelling of diesel you'll find out. I only had to do that once and now have a spin-on filter.
webcraft
Well-Known Member
Yeah, but it's not likely to happen if you keep an eye on the glass bowl and drain any crud, surely?
- W
fredrussell
Well-Known Member
That’s a curious response. They do sell things in countries other than the UK don’t they?
Graham376
Well-Known Member
That's what I used to think but soon learned engine/fuel problems happen when least expected and usually at the worst possible time. Crud or water never appear in the bowl whilst it's being watched
Best to replace CAV filters with spin-on and a separate bowl between that and the tank. We also have an electric fuel pump so bleeding automatic via the return line, literally a couple of minutes to change filter and bleed.
Plum
Well-Known Member
According to some suppliers normal silicone tubing is not recommended for fuel/oil as it is somewhat porous to it but in practice the silicone sleeve I used exactly as you recommended has worked for 7 years although is has discoloured as the red diesel has been absorbed by the silicone.
www.solocoastalsailing.co.uk
Kelpie
Well-Known Member
I've had both Racor and CAV. Having the filter housing in an accessible location makes more difference than the design of filter, IMHO.
A ten pack of Delphi 296 filters costs the same as one Racor filter. I quite like being able to change a filter as readily as I would change a pair of socks. With the Racor I only ever carried one or two spares due to the cost. The only downside to the CAV that I found was that I did once manage to incorrectly assemble it, leading to an intermittent air leak.
I happen to know that Webby's CAV filter is in a sensible location so not really a priority for upgrading.
A ten pack of Delphi 296 filters costs the same as one Racor filter. I quite like being able to change a filter as readily as I would change a pair of socks. With the Racor I only ever carried one or two spares due to the cost. The only downside to the CAV that I found was that I did once manage to incorrectly assemble it, leading to an intermittent air leak.
I happen to know that Webby's CAV filter is in a sensible location so not really a priority for upgrading.
ean_p
Well-Known Member
I think you may be able to use plastic tube if it has sufficient wall thickness/ rigidity such as that supplied with an Eber' in a compression fitting.
Mister E
Well-Known Member
If you have the tank stand pipe. Could you get the blank drilled and the adapted stand pipe Brazed in?