Fuel pump pressure, 2003 Tahoe flex, (not ideling)

2003 Tahoe Flex not idling except in park ...Pump pressure is 42....have replaced fuel filter, Had an o2 sensor code and have replaced upstream o2 sensor , (now no code). The specs for the fuel pump pressure that I have seen if I think 45 - 55 ...one parts store said their comp says 60 ..
If the car runs fine except for idle, could the fuel pump be a problem?

2003 Tahoe Flex not idling except in park ...Pump pressure is 42....have replaced fuel filter, Had an o2 sensor code and have replaced upstream o2 sensor , (now no code). The specs for the fuel pump pressure that I have seen if I think 45 - 55 ...one parts store said their comp says 60 ..
If the car runs fine except for idle, could the fuel pump be a problem?

fuel pressure should be V8 engines 53 psi -62 psi.......

42 psi is too low. below 50 psi it may start if warm out .

KOEO 60-62 psi... engine on with a flex around 52psi ... V8 engine.

idle issues with no codes also can be a bad/dirty TB/IAC along with the 42 psi. never use flex fuel stay away from those high alcohol fuels ... too much damage to fuel system on these OLD GM trucks ....

a regular 87 octane V8 5.3L is 57 psi normal engine on pressure...

Update
Thanks for your information, after doing everything I knew to do except replace fuel pump (air filter, fuel filter o2 sensor, plugs and plug wires), I decided to take it to a recommended shop for another opinion...They said right away that it sounded like it may be the throttle body needing to be cleaned, and the fuel pump may be a possibility. I left it and expected a call that it was a fuel pump problem...but the call was about cleaning the throttle body...cost: $41. I know I will be dealing with the fuel pump down the road but maybe it will last till I replace the Tahoe in a few months. Thanks again for your input.

Update
Thanks for your information, after doing everything I knew to do except replace fuel pump (air filter, fuel filter o2 sensor, plugs and plug wires), I decided to take it to a recommended shop for another opinion...They said right away that it sounded like it may be the throttle body needing to be cleaned, and the fuel pump may be a possibility. I left it and expected a call that it was a fuel pump problem...but the call was about cleaning the throttle body...cost: $41. I know I will be dealing with the fuel pump down the road but maybe it will last till I replace the Tahoe in a few months. Thanks again for your input.

good you had it fixed cheaply. the TB does need cleaning some times. I use top tier fuels like shell./mobil/exxon etc . these fuel suppliers add their cleaning agents that the auto manufacturers claim to keep these components clean longer . even Costco uses these top tier cleaning agents.

I would also recommend adding 2-3 OZ of Marvel Mystery Oil ... MMO keeps the fuel system clean and free from the alcohol damage to metal. lubes the injectors so they work faster and will help on MPG...

1 OZ per 10 gallons is all that is required no more. like anything too much is not better ! walmart has it for about $3.80 QT..

good to post back your results good luck .