truck won't start unless floored and then dies out is it flooded?

Asked by Oct 01, 2012 at 08:24 PM about the 1990 GMC Sierra 1500 C1500 Extended Cab SB

Question type: Maintenance & Repair

My truck has been starting good and running pretty good but dies at times and I have to floor it to get
it started again. Now it won't start at all. What could my problem be?

2 Answers


When you press all the way down on the gas its going into clear flood mode and it prevents the injectors from opening. I would say either one of the two injectors are bad or the fuel pressure regulator ruptured. Im pretty sure the regulator is "kinda" inside the throttle body. If that's the case I would bet that's it. Have someone turn the key on with the air filter of and look at the injectors.

Fuel pump and lines had the same problem in a 97

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