Coke Bottle Noise / Fuel Filler Howling Noise

[boreo]

I'm wondering if this thread is similar to my issue. Car starts, idles, and drives with no issues. At speeds above 50mph, I get a loud howling noise from the fuel filler area. I replaced the gas cap and no difference. I am repeatedly getting the P0445 (large evap leak) code whenever I give above ~50% throttle when the fuel tank drops below 3/4 of a tank.

Not sure if the plan of attack here should be replacing the purge control valve and charcoal canister at the same time. Or do the charcoal canister first.

[spinjockey]

Originally Posted by boreo

I'm wondering if this thread is similar to my issue. Car starts, idles, and drives with no issues. At speeds above 50mph, I get a loud howling noise from the fuel filler area. I replaced the gas cap and no difference. I am repeatedly getting the P0445 (large evap leak) code whenever I give above ~50% throttle when the fuel tank drops below 3/4 of a tank.

Not sure if the plan of attack here should be replacing the purge control valve and charcoal canister at the same time. Or do the charcoal canister first.

The charcoal canister is an easy diy repair. I suspect you have a problem with the purge control valve. Do you get a no start when filling while hot?

[boreo]

Originally Posted by spinjockey

The charcoal canister is an easy diy repair. I suspect you have a problem with the purge control valve. Do you get a no start when filling while hot?

No, I've never had an issue with the car starting from filling any amount of gas, I had it no start once just after I washed the car but that was about it.

[spinjockey]

Originally Posted by boreo

No, I've never had an issue with the car starting from filling any amount of gas, I had it no start once just after I washed the car but that was about it.

There is no guarantee that your problem is the evaporation vent valve. You should do a leak test first.

[boreo]

Originally Posted by spinjockey

There is no guarantee that your problem is the evaporation vent valve. You should do a leak test first.

I'm performing a smoke test over the long weekend.

[boreo]

Ended up dropping the car off to a mechanic I know. Performed the smoke test and a fuel vapor breather line was leaking, changed that and smoke was coming from a gasket around the fuel pump. Swapped both those parts and the howling noise seems to be gone now.

However, still having P0445 engine code. Tried swapping the gas cap and that didn't help either. Mechanic now suspects the fuel filler neck as smoke is no longer coming from anywhere else.