raposak

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?

SOLOLUCKY

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.

raposak

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)

raposak

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.