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Eric Birney

Chasing 0455 Code 2007 Suburban 5.3 flex. help!

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Hello, I am hoping someone can help. I have had 0455 fuel leak code for months. System has been smoked. Purge valve was replaced. Vent valve has been replaced twice, new Evap Canister,  New gas cap. Tank was even dropped the last time. usually a few days  after leaving the shop the light is back on.   Anyone have any ideas? Truck is an 07 Suburban with 5.3 Flex motor.

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18 hours ago, Eric Birney said:

Hello, I am hoping someone can help. I have had 0455 fuel leak code for months. System has been smoked. Purge valve was replaced. Vent valve has been replaced twice, new Evap Canister,  New gas cap. Tank was even dropped the last time. usually a few days  after leaving the shop the light is back on.   Anyone have any ideas? Truck is an 07 Suburban with 5.3 Flex motor.

Ensure that all parts replaced were GM OE or ACDelco Professional.  There is a condition where a leak can exist while the system is under vacuum.  This can be tested by a bi-directional scan tool like the Tech-2 which will use the Purge/Seal function to look for a leak.  This is a large leak, I suspect the smoke test was not done right/thoroughly.  You still have the filler neck, Fuel Tank Pressure Sensor and some more lines that go around the gas tank that could be leaking or their connectors.  This stuff is a pain, I've been chasing a small leak for months but am going to buy a smoke machine to finally get after it.

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7 hours ago, swathdiver said:

Ensure that all parts replaced were GM OE or ACDelco Professional.  There is a condition where a leak can exist while the system is under vacuum.  This can be tested by a bi-directional scan tool like the Tech-2 which will use the Purge/Seal function to look for a leak.  This is a large leak, I suspect the smoke test was not done right/thoroughly.  You still have the filler neck, Fuel Tank Pressure Sensor and some more lines that go around the gas tank that could be leaking or their connectors.  This stuff is a pain, I've been chasing a small leak for months but am going to buy a smoke machine to finally get after it.

That's what I was afraid of.  This has already been an expensive endeavor.  I would have sold the truck if it had not been my Dads.

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51 minutes ago, Eric Birney said:

That's what I was afraid of.  This has already been an expensive endeavor.  I would have sold the truck if it had not been my Dads.

Replacing everything, the shotgun approach, costs about $500.  You've already done much of it and if the condition of the truck is nice, they are nice to drive and make memories with. 

 

Are you in Florida by chance?

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1 hour ago, swathdiver said:

Replacing everything, the shotgun approach, costs about $500.  You've already done much of it and if the condition of the truck is nice, they are nice to drive and make memories with. 

 

Are you in Florida by chance?

No, I wish.  Nebraska. The truck is in great shape and only has 130k for being 12+ years old.

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58 minutes ago, Eric Birney said:

No, I wish.  Nebraska. The truck is in great shape and only has 130k for being 12+ years old.

Ok, too far to use mine.  Replace the rest of the parts or take it to a dealership with a good reputation and have them put their big smoke machine on it. 

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