Seems like sumthing is pulling the battery down to
SOURCE: 2000 chevy silverado 1500 4.3 eng
Chevy Trucks, Blazers, S10 pickup and the like will vapor lock ecspecially the 2000 models. Do not tighten the gas cap past 1 click. There is a tube that runs from the top of the tank down and this gets hot and collapses or burns in half. We just bought a reinforced rubber tube cut it to lengh and use it instead of part and it's worked grat for 2 years so far.
SOURCE: 1990 F150 Fuel pump just replaced but wont turn on
Replace the fuel pump relay. And if your truck has dual tanks there's three fuel pumps, one in each tank and another secondary fuel pump.
SOURCE: our truck just died and wouldnt start. we
diesel or gas engine. if you have a power stroke, look at powerstroke.org
SOURCE: 1998 gmc 2500 sle 5.7 wont stay running
this is in fact the right answer check the oil guage in the truck it should read about 375.
SOURCE: 1995 nissan pickup truck fuel problem
Fuel injected or carb? Make sure fuel line itself is clear. Some pumps are designed to self regulate (carb systems) some continually pump and a psi regulator sends back the excess fuel back to the tank (fuel inj systems) If the line is obstructed then pump can't deliver fuel fulltime.
If you think pump is not on consistent, try running a dedicated wire through a switch directly to the pump. If it works then you are looking for an electrical fault going to pump. Good luck.
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