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Do a fuel pressure check. I had the same problem and it was my fuel pump.
YES they should be.
The fuel pump is located under the rear seat, it is very easy to get to but be careful it is very delicate! when removing the two fuel pipes be very careful as the connectors are weak, push the tab on the side of the fuel pipe connectors and at the same time pull them away from the fuel pump, then you unscrew the large plastic nut and pull out the fuel pump.
Small block and big block fuel pumps and fuel pump rods are the same on all Chevy V8's up to the mid 1980's when fuel injection and new block designs started on the market. Please note that this does not include special cam motors (roller cams, etc) that do take a different (special) rod.
It's possible that your fuel pump is getting ready to quit. It's working hard to push fuel to the engine and the circuit is overheating. Might be doing the same thing with a partially plugged fuel filter. Have both checked.
Yes this is a safety feature found on some cars that is an inertia switch. Power is cut to the fuel pump whenever the car is in an accident. You push the switch to reset it and restore power to the pump. There is also a fuel pump relay, that is sometimes called a switch, although it is not actually a switch. This relay closes and turns the fuel pump on when the ignition is turned on. It will stop the pump if the engine is not started.
Yes.
No.
the fuel pump is located in the fuel cell. the sending unit for the gage & the fuel pump are on the same bracket.
Yes, a Jerk Pump and a Fuel Injection Pump are the same thing. Unit Injectors and Common Rail systems do not use a Jerk Pump.
The "Vortec" engine is almost the same as an old school SBC, all things being such, the push rods are a little different for the OEM roller cams.
yes the fuel injector relay is the same as the fuel pump relay.