Rapid 12 FAC leaking from the Quick Fill

[AndyCM]

hello All,

Ok........here goes.

I'm pretty sure it's not a Best Fittings or Dr Bob quick fill (unless it's a version I've not seen ?).

The bottle has not relocated at all as far as I can tell.

The blanking plate has gone and been replaced with a brass quick fill, that is now leaking, a lot.

So any pointers would be very welcome.

Thanks Andy

[angrybear]

? ? ? if it's leaking from the dowtey washer change it, if it's leaking through the QF itself strip it & look for the problem,
it might be obvious when you look.

[Ca_Varminter]

A bit of soapy water will help locate the leak...
It could be the dowty that seal wear the QF screws in...

or an O-ring on the sealing shuttle in the QF..


Good Luck,
Stuart

[AndyCM]

A bit of soapy water will help locate the leak...
It could be the dowty that seal wear the QF screws in...

or an O-ring on the sealing shuttle in the QF..


Good Luck,
Stuart

Ah thanks Stuart,

That's a very helpful photo, yes it's ok for the metal washers but leaking (gushing) through the one way quick fill......that makes sense why.

I'll investigate.

[AndyCM]

? ? ? if it's leaking from the dowtey washer change it, if it's leaking through the QF itself strip it & look for the problem,
it might be obvious when you look.

Thanks

[AndyCM]

Ok, I removed the quick fill brass part and the metal (crush washer ?) seems a bit mangled now, so I guess another one of those is a good idea (but am sure that's not the original issue that I had).

The "setting" for the one way brass quick fill valve has a tiny o ring that seems ok but I am unsure how to set this screw (and for it to stay set correct) and o ring to hold air.

I seems very loose and looks prone to moving even if I can get an initial seal.

Thanks for humouring me.......i know I don't know what all the bits are called and have no clue what I'm doing !

I may need an expert on the job.

Thanks Andy

[Ca_Varminter]

Ok....
The Dowty sealing washer has been trashed....It needs to be Replaced..
The QF looks to be a homemade Custom job...
So that screw with an O-ring...
Strange.. Is the screw hollow??
is there any sort of core in the brass piece???
I am assuming there is a shuttle like piece internally!
With type of QF there is no "Valving",, It uses the High Air Pressure(HPA)
to force the shuttle to seal!!!!

So it is only leaking at the Dowty washer seal..Replace it!!
No air leaking from the QF... Don't worry about a this point in Time!

Good Luck,
Stuart

[AndyCM]

Ok....
The Dowty sealing washer has been trashed....It needs to be Replaced..
The QF looks to be a homemade Custom job...
So that screw with an O-ring...
Strange.. Is the screw hollow??
is there any sort of core in the brass piece???
I am assuming there is a shuttle like piece internally!
With type of QF there is no "Valving",, It uses the High Air Pressure(HPA)
to force the shuttle to seal!!!!

So it is only leaking at the Dowty washer seal..Replace it!!
No air leaking from the QF... Don't worry about a this point in Time!

Good Luck,
Stuart

Thank you Stuart, i really appreciate the help.

Were you able to view the short video I added the the first post ?

In the meantime ill see if i can work out whats inside the brass quick fill.

[AndyCM]

No hole in the screw, and no obvious way for it to hold in place.

I'm thinking it's going to vibrate loose from shooting or driving, especially if air pressure drops.

I'm wondering if I'd be better to buy the quick fill part per your photo or ask Kev G to sort for me ?

My brass part looks quite extended compared to others I may be able to source / replace with, giving me another headache.

Thanks Andy

[Ca_Varminter]

OK....
I think I figured the QF out...
I bet the screw is tiny bit loose...
So this will allow the +200Bar air to force it's way pass into the Rapid.
The as the pressure builds, this force the screw and O-ring to seal...

if you want a better QF setup... go to Best Fittings...
1/4"bspp...
https://www.bestfittings.co.uk/shop/fill-probes-adaptors/high-pressure-fill-valves-caps/best-fittings-stainless-steel-high-pressure-fill-valve/

Stuart

[AndyCM]

Thanks Stuart,

That makes sense, I've just ordered that part. Fingers crossed I'm up and running soon.

Thank you for all your help.

[Ca_Varminter]

Ok, great!!
You may need to update your Order....
I assume that that old brass QF extended beyond the bottom of the stock.
So the new One from good fitting will be below the bottom of the stock by a bit...
You will need an extended QF socket to reach it!!
Something like this:


Stuart

[AndyCM]

Mmmmmmm Carbon !

I'll happily use tweezers, or take it out of the stock for the first go.

I'll be so happy if it's sorted this week, likely make a trip to the Gunshop for some other stuff anyway, so can add one of those,  ha ha.

[AndyCM]

Well that didn't work !

Started off really promising (and I did buy the extended quick fill attachment), good on Best Fittings for including it in the kit.

But the original brass part is significantly smaller than the Best Fittings 1/4" fill valve, and it definitely will not fit.

I'm majorly disappointed, as I'd hoped to be up and running and on the rats this week, but that's not looking likely with the Rapid.

I'm going to sleep on it, for likely a few days but am currently considering this list of options:

• buy a blanking plug (so ditch the quick fill completely) and fill the buddy bottle and just use the rifle.
Is there any reason that would not work ?

• persevere with the brass part (using varying "torque" settings for the inner tiny o ring) and see if the rifle is usable. Not a long term fix and probably would take a back up rifle incase it dumps all of its air.

• Book in with KevG for a real fix

• force fit the best fittings part (this is the least favoured option).

• Dispose of the rifle via a RFD, get a 1-1 variation and get something new......I'll likely forget about this option tomorrow, but it's how I'm thinking right now

• think of something else

Arrrrrrggggghhhhhhh !

I know some or all of this is down to past fettling (before I owned the rifle).

Mighty frustrating.

[Ca_Varminter]

I am truly sorry for any mis-information I may have passed on.....
Here is a comparison of 1/4" bspp plug from one of my Rapid MKII to a 1/8" bspp fitting....


I think I made a mistake assuming your rapid was a MKII...
Is it a MKI??
So someone may have drilled and tapped a 1/8" bspp hole (not normal on MKI) and made the custom QF..
I wish I was on your side of the POND to make this Right!

Sorry,
Stuart