UAT problems
07-10-2008, 07:20 PM
#28
RE: UAT problems
Hi Guys
I have used the BVM UAT and other similar " air trap " devises for years now and here are a few tips to problem free fuel delivery.
- NEW - I take apart each and every unit and wrap one wind of YELLOW ( oil / gas compatible ) teflon tape. DO NOT USE THE WHITE
TEFLON PLUMBERS TAPE. It will deteriorate over time.
- At the beginning of every flight season I empty the UAT of the old fuel, reseal the cap and refill the unit with fresh fuel. I then allow it
to sit for a while prior to the first flying session. First engine run of the season I give the plane a shake and do several full throttle run
ups followed by a taxi test. I then refill and commence a full flight.
- Make a reference mark on the cap to tank body as a visual check to ensure the cap has not " wandered "
- Lastly - USE 8 volts or less on filling. The guys that use 12volts on filling pumps put expansion / contraction strain on the tank and cap. That's a good way to burst a seam.
As for orientation - once the UAT sack is saturated / primed ( whatever you want to call it ) it does not matter how you position the tank. For peace of mind, most guys place it in a position that creates the least amount of free air space ( ie nipples up and at a slight angle )
Dean W.
I have used the BVM UAT and other similar " air trap " devises for years now and here are a few tips to problem free fuel delivery.
- NEW - I take apart each and every unit and wrap one wind of YELLOW ( oil / gas compatible ) teflon tape. DO NOT USE THE WHITE
TEFLON PLUMBERS TAPE. It will deteriorate over time.
- At the beginning of every flight season I empty the UAT of the old fuel, reseal the cap and refill the unit with fresh fuel. I then allow it
to sit for a while prior to the first flying session. First engine run of the season I give the plane a shake and do several full throttle run
ups followed by a taxi test. I then refill and commence a full flight.
- Make a reference mark on the cap to tank body as a visual check to ensure the cap has not " wandered "
- Lastly - USE 8 volts or less on filling. The guys that use 12volts on filling pumps put expansion / contraction strain on the tank and cap. That's a good way to burst a seam.
As for orientation - once the UAT sack is saturated / primed ( whatever you want to call it ) it does not matter how you position the tank. For peace of mind, most guys place it in a position that creates the least amount of free air space ( ie nipples up and at a slight angle )
Dean W.
07-10-2008, 08:14 PM
#29
RE: UAT problems
I think any of the Nalgene or similar tanks we use in the jets - its always a good idea to check the cap every once in a while, to make sure they are still snug. Thats really just simple maintenance. I've noticed my Topcat tank on occasion needs to be snugged up a bit, along with a pleated filter Nalgene hopper tank I made 6 years ago for another model. [8D]
