Re: 1997 gmc suburban 5.7L will not start. it has fire...
40 psi on a 5.7 vortec isn't enough. It's way too low. You need between 55 and 65 psi to run right. To be certain, you could spray starter fluid into the intake and if it starts, fuel is your problem and replace the pump or filter. A lot of times its the filter so keep that in mind too.
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how much feul pressure, it must maintain a certain amount if injected, or throtle body, try priming it ,and see if it helps, ( poor a little into inlet ) and check it , if it starts you need to check pump, or maybe just filter
The first thing I would check is fuel pressure. This type of fuel injection requires a minimum fuel pressure in order to operate. If fuel pressure is as little as one psi below minimum the vehicle will not start.
You can try squirting a couple of shots of carb spray into the air snorkel while somebody cranks the engine over. If the engine starts and then dies you now you fpdeffinetely have a fuel issue.
If the engine still won't start check for spark.
Let me know what you find.
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Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.
Common description of fuel pump problem on that model.Connect fuel gauge to fitting on fuel rail,drivers side below t/Body,when dies get out and see what fuel preasure is,Should be at about 40 to 45 psi.