gas tank
Team Owner
Joined: Jul 2004
Posts: 28,474
Likes: 3,291
From: Hartford WI
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The fuel system in Corvettes recirculates the fuel. It is pumped up to the engine fuel rails and then any extra fuel travels back to the tank. While the fuel is going through the fuel rails it picks up heat from the engine.
What happens is that the fuel in the tank gets hotter and hotter as the car is driven until it stabilizes. When fuel gets hot it expands. That is what causes the pressure.
What happens is that the fuel in the tank gets hotter and hotter as the car is driven until it stabilizes. When fuel gets hot it expands. That is what causes the pressure.
Team Owner
Joined: Jul 2004
Posts: 28,474
Likes: 3,291
From: Hartford WI
The fuel system in Corvettes recirculates the fuel. It is pumped up to the engine fuel rails and then any extra fuel travels back to the tank. While the fuel is going through the fuel rails it picks up heat from the engine.
What happens is that the fuel in the tank gets hotter and hotter as the car is driven until it stabilizes. When fuel gets hot it expands. That is what causes the pressure.
What happens is that the fuel in the tank gets hotter and hotter as the car is driven until it stabilizes. When fuel gets hot it expands. That is what causes the pressure.
Instructor
Joined: Oct 2008
Posts: 193
Likes: 19
From: Stevenston, Scotland, GB
The vent pipe from the tank is in fact located in the brake pipe bundle running all the way to the front of the car under the drivers sill and it usually blocks and corrodes.
Here in the UK, we don't need that so I removed the entire evap system and fitted a 'roll over' safety valve at the tank which allows the pressured vapour (vapor) to escape yet block off if the car is upside down. The fuel cap is non vented.
Here in the UK, we don't need that so I removed the entire evap system and fitted a 'roll over' safety valve at the tank which allows the pressured vapour (vapor) to escape yet block off if the car is upside down. The fuel cap is non vented.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
a certain amount of pressure in the tank is normal. fuel vapors generated in the tank are vented to a charcoal canister, controlled by the ECM and a purge valve and is vented to the engine under certain conditions. if these conditions are not met, vapors will build, thus pressure. it's all part of the evaporative emission control system, and covered in the FSM. however, not only do I smell gas, I smell a 
, but then again, that's JMO - 
now, not to feed the, I mean the OP, here's a fairly useful thread from a third-gen Camaro forum on the maintenance and repair of the EECS...
https://www.thirdgen.org/forums/tbi/...-gas-tank.html
, but then again, that's JMO - now, not to feed the
, I mean the OP, here's a fairly useful thread from a third-gen Camaro forum on the maintenance and repair of the EECS...https://www.thirdgen.org/forums/tbi/...-gas-tank.html
Last edited by Joe C; Mar 31, 2017 at 06:20 AM.
Instructor
Joined: Oct 2008
Posts: 193
Likes: 19
From: Stevenston, Scotland, GB
a certain amount of pressure in the tank is normal. fuel vapors generated in the tank are vented to a charcoal canister, controlled by the ECM and a purge valve and is vented to the engine under certain conditions. if these conditions are not met, vapors will build, thus pressure. it's all part of the evaporative emission control system, and covered in the FSM. however, not only do I smell gas, I smell a , but then again, that's JMO -
now, not to feed the, I mean the OP, here's a fairly useful thread from a third-gen Camaro forum on the maintenance and repair of the EECS...
https://www.thirdgen.org/forums/tbi/...-gas-tank.html
, but then again, that's JMO - now, not to feed the
, I mean the OP, here's a fairly useful thread from a third-gen Camaro forum on the maintenance and repair of the EECS...https://www.thirdgen.org/forums/tbi/...-gas-tank.html
You could probably run a line of rubber fuel pipe from the tank to the charcoal can easier than replacing the steel pipe if your location states that you need this to be operational for the annual vehicles check.
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