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Old 12-15-2011, 12:30 PM   #1
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Gas cap ?? 5.0

I have a 91 5.0 mustang, dose anyone know what type of gas cap they used on the 91 5.0 is it a vented one? Or non vented? I have been getting alot of pressure in my tank.. The other night my car started to run bad like it wasn't getting fuel or to much fuel.. I got out and unscrewed the cap and I had alot of pressure vent out, once I did that my car started running better..thanks for any and all help..
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Old 12-15-2011, 02:08 PM   #2
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Quote:
Originally Posted by C4king
I have a 91 5.0 mustang, dose anyone know what type of gas cap they used on the 91 5.0 is it a vented one? Or non vented? I have been getting alot of pressure in my tank.. The other night my car started to run bad like it wasn't getting fuel or to much fuel.. I got out and unscrewed the cap and I had alot of pressure vent out, once I did that my car started running better..thanks for any and all help..
You may go to the parts store and look at an OE replacement. Sounds like the original may have been replaced with the wrong one. Is it still tethered to the car? Or still have the ring and broken tether? Basically. An you tell if it's the factory piece?
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Old 12-15-2011, 05:39 PM   #3
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Re: Gas cap ?? 5.0

Quote:
Originally Posted by C4king View Post
I have a 91 5.0 mustang, dose anyone know what type of gas cap they used on the 91 5.0 is it a vented one? Or non vented? I have been getting alot of pressure in my tank.. The other night my car started to run bad like it wasn't getting fuel or to much fuel.. I got out and unscrewed the cap and I had alot of pressure vent out, once I did that my car started running better..thanks for any and all help..

It should vent to the carbon canister on the passenger side of the engine compartment down low on the frame.
Maybe your vent line is kinked or stopped up?
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Old 12-15-2011, 08:34 PM   #4
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It's not the original cap cause it has Stant on it... But I don't have the canister anymore.. Just vents into the air..
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Old 12-15-2011, 09:18 PM   #5
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Re: Gas cap ?? 5.0

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It's not the original cap cause it has Stant on it... But I don't have the canister anymore.. Just vents into the air..
If the tank is building pressure then the vent tube must be plugged up somewhere, or if it depends on the cap to bypass into the vent then it may have the wrong cap on it.
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