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fuel tank vent question

Does anyone know if there is a check valve/float valve in the galvanized (fuel tank) air vent?
I gather that on our coach the air pressure balance line between the two tanks & the galvanized whickerbill air vent (with the  hose that goes to the bulkhead)  share the same tank opening,
'02 40' U320t  4010WTFS Build 6036 1 slide
Motorcade # 17841
SKP 151920
Retired truck driver
 5 million miler
Still have itchy feet for travel

Re: fuel tank vent question

Reply #1 –
Quote from: saddlesore –
Does anyone know if there is a check valve/float valve in the galvanized (fuel tank) air vent?

If you are talking about the galvanized vent valve shown in your 2nd picture.  Yes it has a float valve inside. If you take it off and shake it you should hear it rattle.

Pamela & Mike

Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: fuel tank vent question

Reply #2 –
How can it have a float in it if his is horizontal and mine is vertical. Same galvanized fitting.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: fuel tank vent question

Reply #3 –
That is a rollover valve, in case the coach is upside down the fuel will not run out. I would think that it should not be laying on its side, of course it should still vent unless it is turned upside down.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: fuel tank vent question

Reply #4 –
Saddlesore,
Do you have 2 separate fuel tanks? And is that why you have a tee, where I just have the galvanized fitting sitting vertical?
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: fuel tank vent question

Reply #5 –
I would say that the rollover valve should be mounted vertical rather than horizontal.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins