Compression joint size

[Bobbybass]

Hi all.

 

Just fitted an Eberspacher... 

I already have a diesel feed from the tank which has a blanking cap...(photo)

 

The fuel pipes you see are the too and from engine and are both 5/16 ( looks thicker as it's closer the camera .)

The connection from the tank is reduced to 5/16

 

Anybody tell me the likely thread size on they blanking cap ?

 

Thank you all.

 

Bob

[BEngo]

BSP, either 3/8 or 1/2  for my money.  Can you measure the blanking nut across the flats, using an adjustable and a tape/ruler if you don't have a caliper. That will enable a more definitive answer.

N

[Tracy D'arth]

6 minutes ago, Bobbybass said:

Hi all.

 

Just fitted an Eberspacher... 

I already have a diesel feed from the tank which has a blanking cap...(photo)

 

The fuel pipes you see are the too and from engine and are both 5/16 ( looks thicker as it's closer the camera .)

The connection from the tank is reduced to 5/16

 

Anybody tell me the likely thread size on they blanking cap ?

 

Thank you all.

 

Bob

It looks to be a crimped plug in a cap fitting, not one I am familiar with. But I think I see a fitting behind the cap screwed into a female thread in the tank like the other two connections. I would guess that the tank thread is 1/4"BSP female. Does that help?

TD'

[Bee]

They're not very expensive, buy every likely BSP fitting and chuck the spare ones into the 'Might come in useful one day' bucket.

[Tonka]

How do you know there is a standpipe in it

[Tony Brooks]

1 hour ago, Tonka said:

How do you know there is a standpipe in it

I think its in the side of the tank at the bottom so no stand pipe.

[Tonka]

2 minutes ago, Tony Brooks said:

I think its in the side of the tank at the bottom so no stand pipe.

but shouldn't it have a standpipe so as to pass bss and not suck stuff off bottom of tank 

[Tony Brooks]

Just now, Tonka said:

but shouldn't it have a standpipe so as to pass bss and not suck stuff off bottom of tank 

Once I think but not now. drawing from the top of the tank is best practice and maybe a RCD requirement.

[Tracy D'arth]

This 3rd unused connection could be the tank drain. The OP will need to put a tap on it anyway if he uses it to feed the Eber. Bad idea as it will empty the tank with the heater and leave no fuel for the engine.

I would leave it as it is and drill the tank and thread the hole with a tap  higher up, with say a 1/4" bsp or 3/8" bsp tap and fit a fuel shut off tap.

TD'

Edited July 23, 2020 by Tracy D'arth

[TheBiscuits]

31 minutes ago, Tracy D'arth said:

Bad idea as it will empty the tank with the heater and leave no fuel for the engine

 

That's far less of a problem on a ditch-skip than a seagoing boat.  I agree it's best practice, but if you starve your engine of fuel 10 feet from the bank in a 3 foot ditch it's not really a huge issue!

[Tracy D'arth]

1 minute ago, TheBiscuits said:

 

That's far less of a problem on a ditch-skip than a seagoing boat.  I agree it's best practice, but if you starve your engine of fuel 10 feet from the bank in a 3 foot ditch it's not really a huge issue!

And approaching a weir, stopping in a lock? Its fine until it happens!  Then you may have to bleed the engine! Not to mention the crap in the bottom of the tank getting in the heater filter.

TD'

[Bobbybass]

So....if I was to tap a "T" connection into the engine feed....that goes immediately into a cut off tap....that would be better and ok ?

[TheBiscuits]

26 minutes ago, Bobbybass said:

So....if I was to tap a "T" connection into the engine feed....that goes immediately into a cut off tap....that would be better and ok ?

 

That's not "by the book", but it's how I chose to install my Webasto.  I just don't let the boat tanks get too low without topping them up again - I have never needed to put more than three-quarters of a tank in at once since the day I bought the boat five years ago.

 

 

Edited July 23, 2020 by TheBiscuits
spellink

[Bobbybass]

6 minutes ago, TheBiscuits said:

 

That's not "by the book", but it's how I chose to install my Webasto.  I just don't let the boat tanks get to low without topping them up again - I have never needed to put more than three-quarters of a tank in at once since the day I bought the boat five years ago.

I figured....that may ultimately be how I do it. Means I will will have two shut off valves...main engine fuel then the Eberspacher off a "T". ...

 

Thanks.

 

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