How do i bypass fuel system relay for 2000 chevy silverado lt

There is a fuel pump relay that turns the pump on and off and that relay is controlled by the computer ecm. So with testing you could rule out the computers or the relay to see what it is .

spray gasoline or carb cleaner into intake. If engine starts, it's a fuel problem. You have a bad (new) fuel pump or relay. Either no power to pump or pump is bad (unlikely but possible).

Did you check for a plugged fuel filter inline somewhere. It could be that the fuel pump relay is bad or even the timing may be off.

First thing is have the AC charge checked by a shop, if that is OK then the AC compressor low side pressure switch may be defective or the compressor relay is defective.

If you have'nt tried to start it with the wrong key setting a security violation then you probably need a crank position sensor.

check fuel pump relay, on start up, relay is bypassed, allowing a start, but dies when runs out of gas.

Its the fuel pump relay circuit, could be wiring,relay' or pcm put a relay in cheapest & easiest, key up truck & listen for click to locate pump relay should be in under hood fuse box

jump high pressure switch,if it does not work charge your a/c system..

fuel filter? how about power to the fuel pump,loose ground wire to chasis? wiring harness? terminals clean at point of connection?did you check the fuel pump relay? Relay is located in electrical center under the hood on the driver side.relay and fuse legend will be on bottom side of cover, you sould be able to switch with another relay that you know works, ie: switch horn relay with fuel pump relay, honk horn to insure both relays are working when either relay is inserted into horn slot. Do you by chance have the electrical schematic drawing for the fuel pump?

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.