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Ophir · February 18th, 2003, 19:28

I have no idea if this is a reason but it seems plausible:

With bladders, in the event that your fuel vent became clogged, the bladder would then become void of all fuel. On the other hand, if flying a fuel tank, if the fuel vent became clogged, then a vacuum could set up inside the tank and eventually arrest fuel flow to the engine.

Additionally, when sumping the fuel you are checking for, among other things, H20. If a bladder colapses, the volume of air in the bladder it able to get smaller and thus deminish the propensity for H20 vapors to be in the air and therefore eventually condense into the fuel.

February 18th, 2003, 19:28	#7
Ophir Senior Member Join Date: Mar 2002 Location: was Ophir, CO, now in SLC! Posts: 1,481	Re: Fuel Bladder I have no idea if this is a reason but it seems plausible: With bladders, in the event that your fuel vent became clogged, the bladder would then become void of all fuel. On the other hand, if flying a fuel tank, if the fuel vent became clogged, then a vacuum could set up inside the tank and eventually arrest fuel flow to the engine. Additionally, when sumping the fuel you are checking for, among other things, H20. If a bladder colapses, the volume of air in the bladder it able to get smaller and thus deminish the propensity for H20 vapors to be in the air and therefore eventually condense into the fuel.