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kwiggins29059, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 2871
Experience:  ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
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I think I've found my answer, gas filler tube spring loaded

Customer Question

I think I've found my answer, gas filler tube spring loaded door broke free and is probably in the tank. Check engine light with "Check Gas Cap" on the warning panel
JA: Does the light stay on, or does it blink?
Customer: Stays on
JA: What is the model/year of your Pontiac?
Customer: 2007 GP GXP
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: I'll fix it myself, I haven't attempted anything yet
JA: Anything else you want the mechanic to know before I connect you?
Customer: Pulled codes and getting a P0455
Submitted: 6 months ago.
Category: Pontiac
Expert:  kwiggins29059 replied 6 months ago.

Hello, PO455 indicates a large leak in the evap system. The metal door being gone can put excess pressure on the fuel cap O ring and cause a leak. You can purchase the filler neck assembly HERE, I also suggest replacing the gas cap

Customer: replied 6 months ago.
This is your second request. As soon as I complete the recommended repair I'll rate your answer
Expert:  kwiggins29059 replied 6 months ago.

The ratings request are automated, there's no rush. Looking forward to things going well.