99 Suburban 2500 with a 454 bogs down bad while under load while giving it some throttle. It has a strong air sucking sound while it does this. I hooked up a fuel pressure gauge and here are the readings.



Truck cold: ignition on truck not running 50psi and drops down to 22 in 5 minutes

Truck cold: Running at 47psi

Truck cold: 2000 rpms at 47psi

Truck hot: 47psi



No matter what rpm when hot or cold, it stays at 47psi. So i'm thinking its either the fuel pump or the pressure regulator. What do you guys think?

 

i cannot attest to the pressure figures , but before i put money into expensive stuff like pumps and regulators i would change the fuel filter.

 

The filter was done 6 months ago along with tps, plugs, wires, idle control valve. I could always just throw another filter on (easiest and cheapest to do)

 

New twist to the problem. I just discovered a puddle of rusty water under the truck coming from the water pump. I looked in the radiator to discover that it is quite low on fluid. So the next question is would low coolant cause the bogging? I was doing some reading on the coolant sensor and the entire engine performance is based on what that little sensor tells it.