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It appears there is a faulty connection either on the earth or power cable connection. Make sure all connections are clean and tight, then check with a meter.
There should be a threaded port on the fuel line goining to the throttle body. it will look like a valve stem. any mechanic that is worth something will put a pressured gage on it to test. Will indicate if fuel pump is holding pressure. alsomay be a check valve.
the sending unit inside the tank is bad if you have high miles you might want to change the fuel pump while your dropping the fuel tank out to do the sending unit as it is connected to the pump anyway
On 05+ Trail Blazer, the fuel filter is integral with the fuel pump inside
of the fuel tank. It is a non-serviceable part. On 02-04s, the filter is
on the drivers side frame rail at about the B-pillar. If your trail Blazer is a late 04 which means that it was build close to the 05 Trail Blazer, you may have a non serviceable fuel filter. Good luck and check under your Trail Blazer or look at your manufactured date sticker on the door which would help you indicate if your 04 is a early Trail Blazer and you'll have the fuel filter on the inside frame rail under the driver's door.
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