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Bernhard10
Joined: 25 Sep 2006
Posts: 21
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 Posted: Fri Jun 29, 2007 11:24 am Post subject: Fuel drain valve |
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I don't like the screw type fuel drain valve on my Allegro 2000 ( get fuel all over my hands every time I have to open it ) and I would like to exchange it for a quick push type fuel drain valve I am used to.
Has anybody done that before, and if so, do you know the right diameter or make and model to fit right in ??
Thanks
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Sat Jun 30, 2007 9:15 am Post subject: Re: Fuel drain valve |
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Bernhard,
I complained about this very thing to the USA importer about a year ago. Their "solution" was to send me a 1/8 NPT threaded Curtis Quick Drain valve six months after my complaint, for which they charged me a 100% premium over what I would have had to pay here locally. They did this even after I told them that the female fitting in the bottom of the fuel tank was NOT 1/8 NPT but some sort of straight thread, not tapered pipe thread. The dealer I bought the airplane from said he struggled with this for some time and could not figure out what thread series it was but was certain that it was not metric.
So, I drained the tank and took some careful measurements of the obviously straight threads, including pitch, and looked up all the possible thread series I could find. As it turns out, the fitting in the bottom of the tank is 1/8 British Straight Pipe Thread. So I bought an adapter (1/8 BSPT male to 1/8 NPT female) from some source online (can't remember who). Once we installed the adapter the Curtis Quick Drain valve fit perfectly.
Our Allegro 2000 is a 2003 year model and I have no idea if the factory has changed these fittings to something else in the interim, so I can't guarantee that this will solve your problem. The USA importer still insists that the fitting in the tank of our airplane is 1/8 NPT, but it just isn't so.
I hope this helps. Please advise the list when you find your solution letting us all know what that solution was and which year model Allegro it was on. We cannot depend upon the USA importer or the factory to keep us informed or supply us with this sort of required technical information.
Thom in Buffalo
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Sat Jun 30, 2007 9:22 am Post subject: Re: Fuel drain valve |
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Bernhard,
I think I gave you the wrong acronym for the British STRAIGHT Pipe Thread. I told you BSPT but I think it is BSPP. I think the T in BSPT is "Tapered". At any rate, make sure you get the STRAIGHT pipe thread, whatever the acronym is for it.
Thom in Buffalo
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Bernhard10
Joined: 25 Sep 2006
Posts: 21
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| Posted: Sat Jun 30, 2007 9:57 am Post subject: Re: Fuel drain valve |
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My Allegro 2000 is a 2006 with 56 hours so far. I won't get to investigate the thread issue for 2 weeks because I am on a business trip.
Thank you very much for your very helpful info and I will sure get back to the list once I have found out the thread standard.
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