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 Post subject: Re: Tank baffles
PostPosted: Wed Feb 06, 2019 10:16 pm 
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Location: N.Yorks
Worried about the sender? While you've got the tank out might be the time to replace it....


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 Post subject: Re: Tank baffles
PostPosted: Thu Feb 07, 2019 11:46 am 
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Posts: 116
Tom,
Photo showing breather position on tank

Jack


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SS410 "Mon Petite"
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 Post subject: Re: Tank baffles
PostPosted: Thu Feb 07, 2019 11:48 am 
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Location: Edinburgh Scotland
duncan grimmond wrote:
Worried about the sender? While you've got the tank out might be the time to replace it....


Sender is fine, rather not disturb it!

Tom

PS Thanks Jack

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Chassis # 181 "Snotamog"
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 Post subject: Re: Tank baffles
PostPosted: Thu Feb 07, 2019 9:00 pm 
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Posts: 299
duncan grimmond wrote:
Worried about the sender? While you've got the tank out might be the time to replace it....


If the sender is working I would leave it alone. I fitted a new sender from ECAS (the cheaper one with a quality warning!) and not only was the calibration way out but the wiper on the potentiometer did not make proper contact so the gauge often showed empty with the tank part full.
I repaired the old sender by soldering on a home made brass wiper tip !
David


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 Post subject: Re: Tank baffles
PostPosted: Sat Feb 09, 2019 7:12 am 
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Joined: Sun Sep 15, 2013 9:13 am
Posts: 584
Hi
Appreciate this is a problem and all the good suggestions made but wonder if citroen had already got this solved and their solution is being overlooked

The original 2cv set up was plastic (or metal) fuel tank, stepped rubber connector and shaped metal tube to filler cap

Inside the metal tube is a second smaller pipe which acts as a vent to the tank, fixed to the main tube by the filler orifice, and terminating near the rubber connector

So if you retain the 2cv metal filler cap end, Leave the smaller pipe longer to allow space to clip some rubber petrol pipe to it and adjust the length of the rubber pipe to suit the length to the tank


May be too late for you but not for other builders??

Colin


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 Post subject: Re: Tank baffles
PostPosted: Sat Feb 09, 2019 12:11 pm 
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Location: Edinburgh Scotland
Colin-gser wrote:
Hi
Appreciate this is a problem and all the good suggestions made but wonder if citroen had already got this solved and their solution is being overlooked

The original 2cv set up was plastic (or metal) fuel tank, stepped rubber connector and shaped metal tube to filler cap

Inside the metal tube is a second smaller pipe which acts as a vent to the tank, fixed to the main tube by the filler orifice, and terminating near the rubber connector

So if you retain the 2cv metal filler cap end, Leave the smaller pipe longer to allow space to clip some rubber petrol pipe to it and adjust the length of the rubber pipe to suit the length to the tank


May be too late for you but not for other builders??

Colin


Colin, my reason for a vent is because I plan to fit the unvented fuel filler just below the waistline of the car for reasons mentioned in my first post, not because of slow filling?

Tom

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Chassis # 181 "Snotamog"
LWB Grasshopper SS
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 Post subject: Re: Tank baffles
PostPosted: Sat Feb 09, 2019 8:22 pm 
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Location: Leeds, West Yorks/Limerick, Ireland
I have an unvented tank and drilled a small vent hole (1mm?) in the neck just below the Monza fuel cap. The volume of air required to prevent a vacuum forming as the petrol is used isn't much. It seems to work fine for me. If the car inverts the leakage via the hole will be very small - remember air will have to get into the tank from elsewhere for fuel to escape through the hole.

Rough calc; 50mpg is about a gallon per hour or about 5 liters an hour or 100ml per min.

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 Post subject: Re: Tank baffles
PostPosted: Sat Feb 09, 2019 9:50 pm 
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Joined: Thu Feb 07, 2013 9:37 am
Posts: 1846
Location: North Norfolk
My tank vent is from an 8mm bore pipe off the top of the tank The in-line valve (passes air, not liquid) "hisses" as I refill (it's at the middle-of-the-spare-wheel level, on the tail). When it stops hissing, I know the tank is full, to within 3" or 4" of the vertical filler neck, on the top of the rear deck. There's then 400+ miles of motoring available (normally refilled at ~360).

I recall the "range anxiety" having arrived somewhere, cold and wet knowing that "we need to find fuel in the morning, within the first 20 miles". With the larger tank, " need to refuel today or, at the latest, before lunchtime tomorrow" is well worth the expenditure. I don't miss the 2CV fuel level sender and its 40 year old brass rheostat; I do value a gauge that says "fuel empty", when that's where you are.

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 Post subject: Re: Tank baffles
PostPosted: Sat Feb 09, 2019 10:19 pm 
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Joined: Tue Apr 23, 2013 7:18 am
Posts: 299
Colin-gser wrote:
Hi
Appreciate this is a problem and all the good suggestions made but wonder if citroen had already got this solved and their solution is being overlooked

The original 2cv set up was plastic (or metal) fuel tank, stepped rubber connector and shaped metal tube to filler cap

Inside the metal tube is a second smaller pipe which acts as a vent to the tank, fixed to the main tube by the filler orifice, and terminating near the rubber connector

So if you retain the 2cv metal filler cap end, Leave the smaller pipe longer to allow space to clip some rubber petrol pipe to it and adjust the length of the rubber pipe to suit the length to the tank


May be too late for you but not for other builders??

Colin


Colin
I agree.
I convinced myself that my 2cv locking cap is vented by blowing through the key hole - is that how air is designed to enter as fuel leaves the tank ?.
I used the 2cv petrol cap and the upper part of the galvanised main filler pipe including the gentle corrugated bend. From there I soldered a 4omm copper pipe to join the stepped rubber tank connector. As it is a route with no sharp bends and my filler is 6 or 7 " above the waistline chassis tube I removed the internal 10mm pipe completely. I can fill up quite quickly with no blow-back.
David
PS.
I suspect the 2cv cap has an internal non-return valve. Is this the case ?
When doing that sucking and blowing test through the key hole I could hear what sounds like a valve operating and the flow is freer blowing than sucking. So has it got a built-in safety check valve like Ade described earlier ?


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 Post subject: Re: Tank baffles
PostPosted: Sun Feb 10, 2019 8:55 am 
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Joined: Tue Apr 23, 2013 7:18 am
Posts: 299
Colin
I agree.
I convinced myself that my 2cv locking cap is vented by blowing through the key hole - is that how air is designed to enter as fuel leaves the tank ?.
I used the 2cv petrol cap and the upper part of the galvanised main filler pipe including the gentle corrugated bend. From there I soldered a 4omm copper pipe to join the stepped rubber tank connector. As it is a route with no sharp bends and my filler is 6 or 7 " above the waistline chassis tube I removed the internal 10mm pipe completely. I can fill up quite quickly with no blow-back.
David
PS.
I suspect the 2cv cap has an internal non-return valve. Is this the case ?
When doing that sucking and blowing test through the key hole I could hear what sounds like a valve operating and the flow is freer blowing than sucking. So has it got a built-in safety check valve like Ade described earlier ?[/quote]

I did a more careful look at the 2cv petrol cap and found there is a proper air inlet is (as you might expect) under the top black plastic cover. And there does not appear to be a valve so if the car turned over I reckon fuel would dribble out.
David


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