Gas... I smell lots of gas...

[peterbrown77]

2010 LTZ 5.3, 90k miles.

Noticing a strong gasoline smell at the rear of the vehicle. Suspected the fuel pump assembly rusted out but a) there are no streaks of gas on the tank after filling it to the tippy top and b) I have no Check Engine codes that it should generate by failing the vacuum purge cycle.

After parking the car for a day the smell disappears..... so it's somehow tied to fuel pressure. I've had it on a lift and looked as best I could but I don't see any obvious culprits.

Any thoughts or anyone who's dealt with this before?

TIA

 

[zbad55]

It sounds like your evap canister may be flooded, when the charcoal gets saturated and can't be purged any more you can have a smell of gas. I would that first as well as CVS (Canister Vent Solenoid)

 

[swathdiver]

2010 LTZ 5.3, 90k miles.

Noticing a strong gasoline smell at the rear of the vehicle. Suspected the fuel pump assembly rusted out but a) there are no streaks of gas on the tank after filling it to the tippy top and b) I have no Check Engine codes that it should generate by failing the vacuum purge cycle.

After parking the car for a day the smell disappears..... so it's somehow tied to fuel pressure. I've had it on a lift and looked as best I could but I don't see any obvious culprits.

Any thoughts or anyone who's dealt with this before?

TIA

Sometimes it's just enough leaking to smell but not drip as it evaporates. The charcoal canister could be full of fuel too.

 

[peterbrown77]

Thanks - I'm starting with the evap solenoid, as it's the least expensive part. I would think if it were rust I'd fail and get CE codes. Only other thing I'm thinking is that somehow the attachment points in the fuel line are weeping but at 60psi it should drip. I can't see it so I'll ask if anyone knows what the fuel line is like on the top of the tank? Rubber? Stainless?

TIA

 

[zbad55]

The fuel lines are a type of nylon connected to the fuel pump module with a quick connect.