'77 fuel tank bladder
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Melting Slicks
Joined: Mar 2009
Posts: 3,126
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'77 fuel tank bladder
Photos of bladder in a '77 tank before I throw it away. Just showing what is inside.
From an old tank I picked up. mike...
From an old tank I picked up. mike...
Last edited by mds3013; Jul 17, 2016 at 10:34 AM.
Thread Starter
Melting Slicks
Joined: Mar 2009
Posts: 3,126
Likes: 15
This is a bladder from a wrecking yard find. My original is in the car still.
What I did find was that the vent line on the top of the tank was not tapped into the bladder. mike...
What I did find was that the vent line on the top of the tank was not tapped into the bladder. mike...
Last edited by mds3013; Jul 17, 2016 at 10:32 AM.
Thread Starter
Melting Slicks
Joined: Mar 2009
Posts: 3,126
Likes: 15
Vent was set up that way from the factory. All penetrations into the bladder went through the sending unit. The vent I referred is on the left in this pic. on the side tap of the tee. Venting the area between the bladder and the steel tank. mike...
Last edited by mds3013; Jul 17, 2016 at 04:32 PM.
Race Director
Joined: Apr 2009
Posts: 19,294
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From: Charlotte NC
The fuel cap must allow air into the fuel tank or it can actually get have so much vacuum on it that it collapsed like a crushed soda can.
Does this make sense.
And what happens over time...due to fuel sloshing around and people really topping off the fuel tank...is that the vapor line for the EVAP system gets plugged up with fuel and it turns to varnish and plugs up this line and thus the EVAP system can not pull air from the fuel tank...and knowing that the fuel cap will not allow pressure to pass by it ( or should not)...the fuel tank can NOW be pressurized. Which is not a good thing if it gets to high.
DUB
