On the driverside of the engine towards the back of the intake your fuel lines run there. you will see a black cap that covers the fuel pressure test port. you will need to get a pressure tester if you do not have one. it will screw onto the fitting there. your pressure should be 40 to 60 psi. as for the fuel pump it is located in the fuel tank. it is the fuel module. it contains the fuel pump and sending unit. I hope this helps. Reno
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check the fuel pressure as if this is not correct then this can cause a problem, check running pressures and volume and also check driving pressures as it could be an intermitant problem. then you don`t say if both bank codes were set at the same if so then maf sensor and possibly a problem with injectors could be a problem. but you have to get the codes checked at the time they set and drive around for 1 week or more or you won`t know for sure.
What is your fuel pressure with key on engine off? On these fuel systems if you do not have at least 52 psi or poppet valve inside the injector will not open allowing fuel thru.Let me know what it is i will try to help you.
your tahoe has what is reffered to as a spider injector. meaning it has a central injector and 8 nozzles. you will need to remove the upper intake to replace the injector. this will be the black plastic portion.
If you add a few tablespoons of gas directly to the throttle body after removing the air filter, or use starting fluid (ether), then if the car starts and runs after cranking, then it is a bad fuel pump.
Check the fuel pressure of the fuel pump rail to verify if gas is coming through the system.
If not, it's definitely a fuel pump.
If it were an injector, then it would still try to start on some cylinders assuming it's getting spark.
The fact that the problem started after gas was pumped, points to a fuel pump, as well.
So, I would go for the fuel pump if the fuel pressure is 0 psi or near that, or if one discovers that there isn't any gas coming through the piping when cranking.
Also, check fuses for the fuel pump and injectors.
Fuel Injectors possible, however the problem may actually be with the Fuel Injector Pressure Regulator.
Before deciding if it is the Fuel Injectors Check this first. This could be clogged or malfunctioning.
The Fuel Injector Pressure Regulator is available at:
(NO! I do not work for either store/company)
Autozone Part #800-315 for around $45.
Advance Auto Part #217-3074 for around $90.
Advance Auto Part #23043 for around $46.
Adavance Auto REBUILD KIT Item #9710 for around $29.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!
I would do a full tune up first. Plugs, wires, rotor, cap and coil. If your idle is still rough consider MAP sensor, idle position sensor, or any other emissions sensors maybe suspect. They usually set codes that would trigger your "check engine" light. On the other hand check belts and tension pully if you have one. Lastley, change the fuel filter put in some injector cleaner. A good shop can test the fuel pressure from the fuel pump. I hope this can help.