bad fuel pump?

Could be:

bad gas.
Clogged fuel filter.
bad fuel pump.
Bad fuel pressure sensor (esp if on a boosted application).
fouled fuel injectors.
Fouled/dirty/weak spark plugs or other ignition problem
Moisture in the spark plug wells.

It could also be a number of other things.

Best to start by changing the fuel filter. Next perform a fuel pressure test (got to start somewhere). Monitor with an ODB2 scanner or an external fuel guage. Post the results.

Good luck.

It could always be bad gas, but I'd replace the fuel filter before worrying about the pump. It's cheap, and it's always good to have a fresh one in there for peace of mind.

Motor Gasoline is a un-compressable liquid. As such, the volume of gas will not be that large before FP is near zero. This is NOT a good method to guage fuel pressure.

Besides, we need to know what the fuel pressure is while under a load.

Drity clogged fuel injectors may not throw a DTC unless it is SO bad as to cause chronic misfires.

If you suspect fuel injectors, try an injector cleaning/flow testing service such as injectorrx.com. Much cheaper than new and once tested, the injectors are as good as new.

If you were to ask me to handicap this, my vote is fuel pump. But I am the kind of guy that really dislikes throwing parts at a problem. Instead, test first and then repair.

+ 1 Fuel Pump, but yes get the fuel pressure tested make sure its not the relay or somthing even simpler than having to spend an hour dropping the tank.