gas tank pressure
Thread Starter
Instructor
Joined: Jan 2006
Posts: 110
Likes: 1
From: Auburn NH
gas tank pressure
my gas tank suddenly has a lot of pressure when i take the gas cap off, i can even hear the gas tank pop back to its normal size. If i really step on the gas i can suddenly smell gas fumes in the car. Anyone have an idea what is causing this? is it the vacuum system? the vacuum hose that goes to the tank, does this have vacuum coming from the tank or pressure going to the tank?
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
There is no vacuum hose going to the fuel tank. There is a vapor recovery line that goes to the charcoal canister. The only time vacuum is used is to purge the canister when the engine is running.
Your line from the tank to the canister is probably plugged.
Your line from the tank to the canister is probably plugged.
same thing happened to mine...the fun part is finding the part thats plugged!
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
The constant return fuel system used on C4s heats the gasoline (runs through the fuel rails and back to the tank) and is one of the reasons most of the new GM V8 models have fuel rails don't have a return line.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
If you remove the vent line at top of tank (LHS ) and at the canister you should be able to through blow line .
Pro
Joined: Mar 2008
Posts: 579
Likes: 2
From: High Bridge New Jersey
Or
my gas tank suddenly has a lot of pressure when i take the gas cap off, i can even hear the gas tank pop back to its normal size. If i really step on the gas i can suddenly smell gas fumes in the car. Anyone have an idea what is causing this? is it the vacuum system? the vacuum hose that goes to the tank, does this have vacuum coming from the tank or pressure going to the tank?
