430 Engine down on power after filling up with gas

You sure it's only when you fill up, or is it when you turn your car off, but restart it shortly after? Filling up is usually the only time cars are off for very short periods of time so want to make sure it's isolated to actually putting fuel in versus the car being hot and restarted.

Probably unrelated, but my wife's Jeep had similar issues. Turned out to be heat soak with the injector rails. Hot exhaust under the injectors would cause the issues, but only if it was started shortly after turning off (like at a gas station). Do you have any heat protection on your headers?

 

If your charcoal canister hasn’t been replaced I would start there.

 

since this is a 430, there is a diagnostic pump and check valves that should be inspected in the canister "loop". If the check valves have fuel in them, it could also be a problem.

 

I really have to jump in here and ask how a bad charcoal canister or associated components, without setting codes would cause OP issues

 

I would take the hoses out and see if fuel comes out. If you take the canister out and it's filled with fuel (i.e. you hear sloshing because the charcoal has turned to slush), that is also an indicator you need a new canister. I'm not sure how you test the diagnostics pump other than a smoke test to see if it's leaking. I know when my mechanic was troubleshooting my car, he did a smoke test and then also showed me the fuel dripping from the check valves when he removed them and the sloshing of liquid fuel/carbon in the canister. Then again he knows I like to see the results of triaging a problem because I'm a geek.

 

I dug through my old records and there was a check engine light (major purge control leakage) when my charcoal filter was replaced (prior to my ownership, at about 21.5K miles).

 

The Key statement you made is that it works fine after a ECU reset (battery disconnect) ..which leads me to believe it has either fuel rate or timing curve ..

Questions

Do you have any diag tool
Do you recall the events that happened right before the first appearance of issue
Long shot..did you ask Trev if he has seen this before with his tune ..maybe some parameter /sensor value is sending his logic down a different path code wise (sone kind of safety)

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I responded to your PM

Basically use the launch data stream to look at the ECU data when car is acting normal vs not ..at different rpms

Based on the limited info it does sound like a timing issue ..so going back to the tune and Trev is a good starting point

Your symptoms sound more like when someone has a bad variator..that what leads me.to believe a timing issue
.but of course you didn't get any codes

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