Blown Away By Fuel Tank Pressure

[01Tahoe175K]

New subscriber today. This is a great resource. I have an '01 Tahoe with 175K miles. The check engine light has been on for awhile now. I had my shop check it and they said that it was a problem with the fuel evaporation system. He did some preliminary checks and couldn't find any problems. Now, when I take the fuel cap off to gas up the pressure inside the tank is a little scary. I have to vent it off slowly, otherwise it will try to knock the cap out of my hand. Has anybody else had this problem, or have any suggestions for a cure?

 

[chauncey0337]

Welcome. Maybe start off by testing the gas cap.

 

[ezdaar]

can you fill up the tank easy?
as in insert nozzle squeeze handle and let it fill up, or does the pump stop 20 times before tanks full?

 

[01Tahoe175K]

Fuel tank fills with no problems.

---------- Post added at 09:52 AM ---------- Previous post was at 09:47 AM ----------

The fuel caps don't vent to the open air anymore, do they? That would seem very "un-green". The cap seems to work the same as it always has. How would one go about testing it?

 

[wowthatnice]

can you fill up the tank easy?
as in insert nozzle squeeze handle and let it fill up, or does the pump stop 20 times before tanks full?

I have this problem, how can I fix it?

 

[Goldcuffs]

Most common problem is a vent solenoid. Make sure you get a GM replacement not an aftermarket.

 

[Walynw]

I just replaced evap solenoid with one from oreilys Light went out thought things were good. Wife called said cap had pressure and wouldn't take fuel but very slowly