1989 chevy k2500 i put a brand new fuel pump in it a couple of weeks ago and ran fine . untill a couple dys ago iwas coming home and the truck just up and died in me 3 or4 times but started right back up. but now there no fuel being pumped up to the tbi . i have a hard time believing the pump is bad again.... is there omething els i should be checking?

Pump pressure and "volume" were both tested ? How about the ignition module ? Crank sensor heat failing .

try the fuel sending unit

Is this still having issues

Is the base fuel pressure the same hot when it is cold, and so is the spark weak when the engine is hot ?

Could be crankshaft sensor.

have you checked the oil pressure sending unit switch?

Likely a clogged fuel filter or defective fuel pump. Confirm correct fuel pressure with a gauge. If the pressure is low, remove the fuel filter and check for obstruction. If it's hard to blow through it, replace it with a new filter. Then retest the fuel pressure. If pressure is still low, then it's likely that you have a defective fuel pump.

parts do go bad and make sure you click the gas cap 3 times to ensure its closed also any dryrotted vacuum lines ?

try resetting the fuel pump inertia switch located in the side of the trunk.

Sounds like the injectors may be bad or just really dirty. You say that the truck is only used as a plow truck, so I would assume that it sits alot. If you dont add any fuel stabilizer to the tank, the fuel will start to degrade and the will gum up your injectors. One thing you can do is to pull the air cleaner assembly off and look at the injectors while the truck is running. Look at the bottom of the injectors while it is running. The injectors shouldbe spraying fuel with a fan spray of fine mist. If you see any drips of fuel in the this fine mist, that injector is at least dirty or on its way out. I would recommend that you change your fuel filter and then get some fresh fuel and the purchase some Seafoam fuel injector cleaner from your local parts store. Dont mess around with anything else. GET SEAFOAM. If it is in a plastic bottle it is not strong enough to do anything. Seafoam is in a metal can. Dump the seafoam in and run the truck as much as you can. This will help clean out the injectors.