Thread: Car cranks but no start. Fuel injectors not releasing gas

Originally Posted by Shiftingshaddow

Would the fuel pump, if already weak, just not be able to give enough pressure if it hadnt been used in over a week? The car has 190K on it.

There wouldn't be any kind of sensor, that if bad, would cause no power to the injectors?

Tomorrow can try more to see if they are getting pulse and check the fuel pressure with a gauge but for now have to ask questions in hypotheticals.
Thanks guys.

You are on the right track here. No sensor will stop the injectors from opening during the prime sequence for startup. This is exactly why you need to verify that the injectors are getting a +12 volt continuous when the key is turned to the on position. The +12 volts are looped from one injector to the other; all the same circuit. Just test one and that's it. This takes about 1 minute to perform.

Next is the fuel pressure...should be > 45psi at the rail when the pump primes. The pressure may bleed down a bit after the pump shuts off. Don't try to start the car and watch the fuel pressure after the key has been turned to the on position. It might lose 10 psi over 10 minutes which is fine.

Here is what you need at the injectors for the car to start:
1) Fuel rail primed
2) Fuel pressure >45 psi
3) +12 volts continuous with key on
4) Commanded ground from the PCM

If you have all of this and it doesn't start then the injectors are bad or clogged. You've already verified that it will run with fuel so all other systems are operating properly.