<VV> [fastvair] Re: Fuel leakage

Jay Maechtlen jaysplace at laserpubs.com
Sun May 24 19:37:26 EDT 2015

On 5/22/2015 10:21 PM, Sethracer at aol.com wrote:
> Jay - Depends?
Yesterday I actually worked on the beast.
I pulled the filler, and cleaned it out thoroughly. Wire brush on 
inside, compressed air. Got lots of white dust and crud out of there.
Drilled a hole and added a vent line to it, across where the stock vent 
tube connects.
A piece of 1/4" fuel hose goes from there to the bottom of a catch can I 
brewed up.
Any gas that does make it to the vent line should stay in the catch can.

I then modified the gas cap so that it seals tightly. There will be no 
leaking past the cap.
(at least, it held against lung pressure and didn't pass any bubbles 
into a can of water)
So, I need to fill it up and throw it around, to see how much gas gets 
into the catch can

Oh, yes - in examining the fill neck assembly, the inner tube comes up 
pretty close to the cap.
I made and mounted around plastic disk to the cap that goes into that 
neck section.
When gas comes sloshing up the neck, that plug will stop most of it, so 
the gas cap has less to block.

None of you guys mentioned that, but if you're running a vented cap it 
could make a difference.


> -Seth
> In a message dated 5/22/2015 8:32:18 P.M. Pacific Daylight Time, 
> fastvair at yahoogroups.com writes:
>     On 5/22/2015 2:43 PM, BBRT wrote:
>     > I think a proper solution is to provide a vent tube from fuel tank
>     > inlet hose or where later LM's have a fuel return line.. Run the
>     vent
>     > up so it is centered in the area in front of windshield beneath the
>     > grille. Put a filter on it in the event there is slosh . Then use a
>     > sealed fuel filler cap for autocrossing.
>     >
>     Ah. That sounds especially promising.
>     (my car doesn't have a door over the cap, so any incontinence is on
>     display for the world)
>     Maybe a small separator can along the way to the vent.
>     Thanks.

Jay Maechtlen
'61 2-dr modified w/fiberglass skin,
transverse 3.8 Buick V6 TH440T4 trans

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