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Dennis.Kirby(at)kirtland.
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 Posted: Thu Oct 16, 2008 11:13 am Post subject: Gas and PVC |
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(NOTE - Subject Line changed to reflect current topic.)
"grantr" wrote: << Simple cheap and effective! I could probably make a
better one (gascolator) out of some pvc or galvanized pipe from lowes.
using a t fitting to rune 2 fuel barbs and a pipe on the bottom of the T
as the sump for the water. Anyone know how gasoline affects pvc? >>
Grant -
Following the advice of someone else on this List, I made a homemade
gascolator using PVC. As you correctly observe - simple, cheap,
effective! (I'd like to give credit to whoever it was that I copied it
from, but I forgot who it was! Was it you, Richard P?)
I used a 2-inch long piece of 1-1/4" diameter schedule-80 PVC, with end
caps glued on. Drilled two 3/8" holes opposite each other near the top
(thru the end cap), and screwed a brass fuel barb into each hole. On
the bottom PVC cap, I drilled another hole in the center, and threaded
into it a Curtis drain valve. I installed the gascolator so that the
drain valve pokes out thru the fabric, on the belly of my Kolb. (Which
also happens to be the lowest part of my fuel system.) Easy to take a
fuel sample from on preflight.
I used fuel-proof thread sealer goop (a Permatex product) on the 3 holes
where brass hardware is threaded in. It's been installed for over 3
years now, and I've never had a leak. More details are in the archives
- this thread has been discussed before.
To answer the question of gasoline vs. PVC - before making this homemade
gascolator, I set out to prove to myself that PVC would not be affected
by gasoline. I filled a glass jar with gas, and dropped in a short
piece of PVC pipe. I let it sit for several months. No discernable
degradation to the PVC.
Dennis Kirby
Mark-3, 912ul
Cedar Crest, NM
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Thu Oct 16, 2008 4:38 pm Post subject: Gas and PVC |
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At 03:10 PM 10/16/2008, Kirby, Dennis CTR USAF AFMC MDA/AL wrote:
| Quote: | Following the advice of someone else on this List, I made a homemade
gascolator using PVC....
...I filled a glass jar with gas, and dropped in a short
piece of PVC pipe. I let it sit for several months. No discernable
degradation to the PVC.
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That's encouraging. All the chemical compatibility information I've found
shows PVC compatibility with unleaded gasoline and ethanol as only
"fair"... "good" for leaded, and "excellent" for "high aromatic gasoline"
(whatever that is). CPVC (the typical tan plumbing pipe) is listed as
worse, only "fair" for all types of gasoline. Makes me leery.
-Dana
--
Be wary of strong drink. It can make you shoot at tax collectors-- and miss.
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Richard Pike
Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee
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| Posted: Mon Oct 20, 2008 5:40 am Post subject: Re: Gas and PVC |
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We fabricated up this motley collection of PVC and plumbing to add a few gallons to the FSII without having to replace the stock tanks. More than a year old and no problems.
http://www.bcchapel.org/pages/0003/FSIITankMods.html
Richard Pike
MKIII N420P (420ldPoops)
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