03 Avalanche replaced fuel pump 2 years ago, fuel pump recently failed again - it was replaced along with the fuel filter.Failed to start four times in the past month w/o pumping the gas pedal?

10

Asked by Jul 28, 2015 at 06:12 PM about the 2003 Chevrolet Avalanche 1500

Question type: Maintenance & Repair

2003 Chevy Avalance with 143K miles - it has been in the shop for two days and they cannot replicate the problem of it not wanting to start without pumping on the gas pedal - would could this be?

3 Answers

65,975

Pumping the gas pedal on a fuel injected engine does absolutely nothing but admit more air to the engine. I'd suspect a bad/dirty IAC (Idle Air Control) valve, or dirty throttle plate. You may have faulty fuel injectors flooding the engine. Check the spark plugs for gasoline fouling. You might want to check the throttle position sensor for proper operation too. HTH. -Jim

10

Good to know - it is kind of habit to try something like pumping the pedal when the engine does not start. Are you saying if we keep trying w/o hitting that pedal - it just might start?

1 of 1 people found this helpful.
65,975

It may. One other thing you can try is "cycle" the ignition key. Turn the key on but don't try to start it. Count to 5. Turn the key off then immediately try to start it. If that works every time, the fuel system is losing pressure. This is a sign of a failing fuel pump. On the other hand, if you think it's flooded, hold the gas pedal to the floor while cranking. This puts the computer in clear flood mode. In clear flood mode fuel delivery is greatly reduced until the engine gets going. HTH. - Jim

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