Re: Car does not want to start after adding gas to the gas tank
To start with, "pumping the gas" doesn't work on EFI vehicles like ours. In the days of carburetors the physical action would actually squirt fuel into the intake and make a richer AFR (air-fuel ratio), enabling a cold engine to start more easily, but only if it wasn't flooded with too much fuel.
On EFI the fuel is controlled by the computer and reacts to the "gas" pedal, which now simply moves the throttle plate to allow more air to enter the intake. The computer meters the air flow (MAF - mass air flow - on ours) and calculates the correct injector timing pulse or looks up a value in a table.
Being difficult to start can be several different things.
1. Is the battery fully charged and capable of starting your car in cold weather? On a 2010 the battery may still be covered either fully or at a pro-rated amount. Have it tested and make a decision on whether to replace it.
2. Is the alternator charging the battery fully? Have it tested and possibly replaced under warranty if defective.
3. Are the battery cables clean where they connect to the battery? Are they clean where they connect at the other ends? A poor or dirty ground connection can do what you describe.
4. When driving the car did it seem like it was running poorly, especially at highway speeds? You may have gotten junk or water in the fuel. Water is heavier than gas and sinks to the bottom of the tank, which is what you'll suck up first. If it's just a small amount it could make starting difficult but still allow just enough fuel to sputter. Then, once running, the increased flow would be enough to keep it running, even if poorly. When was the last time you changed the fuel filter? Might be a good time to service it.
5. Did you fill up at the same station and/or same pump? You might have junk or water from the first time, and if the same pump, more of the same. See #4 above.
6. The gas cap code won't prevent it from starting. It simply lets you know you didn't get the tank sealed properly, either from leaving it off, not closing it fully, or from a failed gasket.
7. If the injectors are leaking fuel after shutting off it could be flooding the engine with fuel vapors and stepping on the throttle allows more air to mix and eventually start. Do you use "Top Tier" fuels or "Mom N Pop" gas? Top Tier fuels actually help keep things clean, including your injectors. If you use Mom N Pop fuels then you might want to consider Chevron Techroline additive. It might be good to double-dose it a time or two. If dirty injectors and/or valves is the cause this product can definitely help!
8. Is the starter weak? Or drawing too much amperage? Having it checked can possibly lead to a solution.
Last edited by DrivenDaily; 12-31-2012 at 08:26 AM.