Pumping a fuel injected car doesn't do anything until after it fires,, turn the key to the on position, listen for the fuel pump to activate,, 2 things could be happening,, one your fuel filter is clogged, and also your pump may not be holding the pressure thats needed , change the filter first since thats an easy step,, and cheaper too, if that helps ,, great, if not,, have the pump checked for constant pressure within the necessary limits , if its bad,, you have to replace it .
'pumping' a fuel injected engine is NOT like the old days (like with a carb)-if you hold the petal to the floor, it shuts off the injectors-NO petal, the injectors pulse (and dump fuel to an engine that is slow to start). If you are having hard starting, chances are good you have a flooding condition-leaking injectors, leaking O-rings, a damaged fuel pressure regulator could all be re3asons for your hard starting (and backfiring from a flooded engine). You should try to HOLD the petal to the floor and see if that helps-if it does, you should get the fuel regulator checked, replace the injector o-rings, check fuel pressure and might even need to consider replacing injectors themselves (or having them cleaned).
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