Newest Gallery Photos

  1. Chevy Truck Forum

    Welcome To!

    The #1 Chevy Truck Forum Online

    Online since 2004, we're the #1 Chevy Truck & SUV user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free

    Registering is Free and Easy! Do it today and we'll see you on the forums soon!

EVAP System?????

Discussion in 'Performance & Fuel' started by cchas14, Jul 8, 2008.

  1. cchas14

    cchas14 Member

    Need help with finding out why I am getting too much pressure in the tank. When I open the gas cap I get and feel air pressure escaping. Can anyone tell me what the problem is? Fuel line look fine, EVAP system seems to be working. This is for a 1991 Suburban 350 TBI 5.7.
  2. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

    I thought that was normal. Mine does it, so do all my other fuel injected vehicles, of course only after the ignition has been turned on and the fuel pump has created pressure in the system. IIRC, most fuel injected systems need something like 35-45 psi.

Share This Page