Roll-Over valve?

[vkykam]

Since I bought the car almost 2 years ago, I've always had a problem with the fuel tank being super pressurized. Every time I go to the gas station to fuel up, it'll hiss for several seconds as I unscrew the cap. I've checked, and it's not air going in.

I also removed the two hose from the charcoal canister, and try to blow into the one coming from the fuel tank, with the fuel cap removed, and I can't blow into it.

Question is, could it be anything else other than the roll-over valve? How easy is the roll-over valve to change?

Thx.

VK

[Beav]

There are two different valves that could cause the problem. There is a roll-over valve"

PURPOSE
Prevents fuel from flowing into the canister in the event of vehicle rollover.

LOCATION
On side of fuel tank.

OPERATION
The valve is constructed of passages and check balls. When the vehicle valve is tilted, the check balls cover the passages, preventing fuel flow through the valve.

R&R
Raise vehicle to access under carriage.
Disconnect fuel lines from valve.
Remove bracket fasteners and valve.
Install in reverse order. NOTE: Do not install valve upside down.

TO TEST:
Connect hose to rollover valve as shown.
While blowing through the hose, tilt valve at least 90°left and right from normal position. Make sure air flows through valve.
Air should not flow through valve when it is tilted further than 90°.


There is also a fuel cut valve in the gas tank that keeps fuel from slopping up into the evap system. To access it you need to remove the fuel pump carrier:

Service and Repair

Fold down rear back seat, then turn up floor mat.
Remove fuel tank access cover, then disconnect fuel pump connector.
To release fuel pressure, start engine and allow to run until it stalls.
After engine stalls, crank for five more seconds.
Turn ignition to Off position, then disconnect hoses.
Using replacer tool No. 42911PA000 (we use large pliers), remove fuel tank cap. (not the same cap you fill the tank from)
Remove fuel pump from tank.
Remove fuel cut valve.
Reverse procedure to install.

To check it:

Remove fuel cut valve from tank.
Attach a vacuum hose to the fitting.
Partially submerge the valve in water an apply vacuum to the fitting.
Vacuum should hold when the float raises.
Vacuum should not hold when the float lowers.

I'll place some pics in my locker.

[Beav]

BTW, I'd start with the roll-over valve. Remove the tank side hose from it and try to blow through (watch out for gas flow, some people here think it tastes bad. ;) )

[vkykam]

Beav,

Thanks for the info.

The roll-over valve doesn't sound too bad to remove. I guess I'll get to it this weekend.

VK