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  #1  
Old 07-14-2017, 07:42 PM
LUKLA's Avatar
LUKLA LUKLA is offline
 
Join Date: Apr 2016
Location: Phoenix,AZ
Posts: 64
Default Fuel tank Air vent.

Just curious.
Is any one has done your air vent differently than just making #30 hole in the fuel cap on RV12 gas tank.
I have heard there is new way ppl are doing but haven't seen any picture or schematic or instruction.
input will be appreciate as always.

LUKLA
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  #2  
Old 07-14-2017, 08:10 PM
Slane Slane is offline
 
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Location: Hillsboro, OR
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Default Fuel tank air vent

See section 37: http://www.vansaircraft.com/pdf/revi...Section_37.pdf
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  #3  
Old 07-14-2017, 08:30 PM
2johns 2johns is offline
 
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I think it is a very good idea to change the fuel vent location as Van's has suggested in 37-01 Rev 5 due the possibility of the hole in the cap being plugged or a new owner being unaware of the hole in the cap, losing the cap, replacing it with a new one without drilling the the vent hole. A possible cause of a disaster. I made the revision moving the vent to the top of the tank. Only problem was that I have an automatic shut off and when it shuts off, a small amount of gasoline would spew out the new vent onto the floor. Why, I do not know. I then moved the vent an inch or so below the top of filler neck and plugged the fitting on the top of the tank using the same vent outlet location on the bottom of the fuselage to solve this problem.
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  #4  
Old 07-15-2017, 10:28 AM
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scottmillhouse scottmillhouse is offline
 
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I recommend having both vents, the new tank and the cap. I initially built mine without the cap vent and was having variable fuel pressure when the tank was filled. Put a vent hole per instructions in cap and no problem the last 100 hours.
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  #5  
Old 07-15-2017, 11:51 AM
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Phantom30 Phantom30 is offline
 
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Quote:
Originally Posted by scottmillhouse View Post
I recommend having both vents, the new tank and the cap. I initially built mine without the cap vent and was having variable fuel pressure when the tank was filled. Put a vent hole per instructions in cap and no problem the last 100 hours.
Very interesting....me thinks I'll try that as I've seen changing (lowering) fuel pressure as fuel is consumed (and I know my vent works as fuel runs out if I overfill tank)...

Scott...where would find instructions on how to drill vent hole in cap?
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  #6  
Old 07-15-2017, 03:45 PM
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Piper J3 Piper J3 is offline
 
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Actually I subscribe to the vented cap all by itself. I use 93E10 auto fuel exclusively and donít want a lot of air exchange in the tank. Alcohol is very hydroscopic and will absorb moisture in the air. Also, octane rating for auto fuel will diminish if not stored in a sealed container.

So I run a cap with the small vent hole and have had zero problems in 258 hours. When I did the fuel tank SB I elected to not install the new vent system. Fuel pressure and fuel flow are rock steady regardless of fuel quantity.
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  #7  
Old 07-15-2017, 04:43 PM
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LUKLA LUKLA is offline
 
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Location: Phoenix,AZ
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Quote:
Originally Posted by Piper J3 View Post
Actually I subscribe to the vented cap all by itself. I use 93E10 auto fuel exclusively and donít want a lot of air exchange in the tank. Alcohol is very hydroscopic and will absorb moisture in the air. Also, octane rating for auto fuel will diminish if not stored in a sealed container.

So I run a cap with the small vent hole and have had zero problems in 258 hours. When I did the fuel tank SB I elected to not install the new vent system. Fuel pressure and fuel flow are rock steady regardless of fuel quantity.
So verdict is Just make # 30 hole in fuel cap and it will do perfect !!!

Thanks a lot Folks.
Lukla
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