> Not certain I understand how
vacuuming a tank makes things worst, unless you are saying it could give you a
false sense of all >being well, but with debris
remaining.
The issue with
vacuuming a sealed tank from the filler hole is that once you stick a big
sucking hose in the filler hole what you will get is a lot of in-rushing air
around the nozzle that will blow bits of debris to the four corners of your
tank. The air being sucked from the tank is replaced by air coming in the
filler hole. So, if you use a small hose – say ½” ID then the amount and
velocity of in-rushing air won’t be as great and won’t disturb any debris that
might be near the filler hole. Takes a long time to vacuum the tank with a ½”
ID hose – but it’s the only way to do the job
effectively.
Thanx,
Joe Hull
Cozy Mk-IV #991 (In Phase1 Flight Test
- 10.9 hrs flown)
Redmond (Seattle), Washington