It start with hard to start after getting gas. So I got it checked and with a list of problems, I start changing parts. Starting with evap canister under hood then evap canister in trunk with charcoal filter, plugs coils, mass air flow sensor air filter fuel pump and gas cap. Now the fuel pump and gas cap did the most it still is hard to start. It has 175000ish miles mother feels strong have you come across this before. Sorry for poor punctuation ND spelling lol
2010 huyndia genesis 4.6l
Check the starter. Have someone bang against the starter while you're starting the car. If you're hearing it crank while someone is banging the starter, then you know that the starter is going out.
Check the EVAP control solenoid and your gas cap.
If this "hard starting" only happens after you gas up then one reason may be that your Evap Vapor Canister Purge Valve isn't closing.
If it isn't closing then there's a few reasons why that may be happening.
1) The Purge Valve is Stuck open (mechanical failure)
2) There's a short to Ground on the "control side" of the wiring to the Purge Valve Solenoid.
3) The computer is commanding the Purge Valve to Open on a "warm start". (it shouldn't).
You can test the theory with nothing more than a tool to disconnect the "canister side" hose from the Purge valve and your finger.
Here's the Evap Vapor Canister Purge Valve. One inlet goes to the intake manifold and the other inlet goes to the Charcoal Canister.
They're typically wired where the computer controls them by providing a Ground (pulse) like this.
To figure out if the canister purge valve is the problem you need to determine if the Canister Purge Valve is OPEN after you gas up (on a warm start). ((it shouldn't be open then)).
So after you've familiarized yourself with how to disconnect that "canister side" hose on the Purge Valve, the next time, at the pump before you put gas in it, remove that hose.
Fill it up with gas. Then wet your index finger and hold it over the purge valve inlet which you removed the canister side hose from.
Have your assistant crank the engine (I forgot to mention, bring an assistant).
You shouldn't feel any suction
If you feel suction, then gas vapors are getting sucked into the intake on a warm start after you refuel. Moreover, during refueling it's likely you've created (for a little while) more positive pressure in the tank that's going to shove those fuel vapors down your intake manifold's throat. (too rich for a warm start)
So I took the long way around but here's the drill:
The next time, at the pump just before you put gas in it, unplug the canister side hose on the Purge Valve.
Gas up and then wet your finger and feel for suction (vacuum) on that Purge Valve inlet as your assistant cranks the engine..
If you feel suction, unplug the wiring connector. If the suction remains, you have a faulty Purge Valve.
If after unplugging the wiring connector you don't feel suction, then there's either a short to ground on the "control side" of the Purge Valve wiring or the computer is commanding the Purge Valve open (on a warm start when it shouldn't be).
One reason that could be happening is if the ECT (Engine Coolant Temperature) sensor is defective
hard to start after getting gas.
this is often a fuel pump problem
