I parked my 02 chevy express on incline with 1/4 tank. wouldnt start.couldnt hear the pump.tapped tank still nothing. put van on level ground tapped tank and started. drove home tried again and started right up. sat for 1/2 hour then wouldnt start. tapped tank and started again and still starting.

SOURCE: Chevy g20 van wouldnt start/stalling

It sounds like it may be a problem with the PATS (Passive Anti Theft System). Chevy has been having problems with PATS since 1992 til current. Even if your key doesn't have a visible "chip" in it, it is possible that you have the PATS system. The newer PATS systems work by recognizing the exact cut of the key. In some cases extremely worn out keys have been known to stop working correctly with your ignition. In worst case scenarios the ignition cylinder itself, which contains the other chip for PATS, wears out so badly that, one time in ten or more your vehicle doesn't recognize the key and fails to start. The logic is this: If a thief tries to jimmy the ignition, the PATS system shuts down the ignition system for 20 minutes (30 on some vehicles). This is supposed to discourage the thief from trying again, while still letting you start your vehicle. There are procedures for bypassing the PATS system on many vehicles, but it is not for the faint of heart. The wiring work itself isn't bad, but there are catches: 1) you must have the vehicle running while you make the modification in most cases, and not shut it off during the bypass. 2) It's recommended you install a switch in the bypassed wire so you can disable your bypass in case your vehicle needs service. 3) if the vehicle dies during the bypass for some reason, you may have to visit the dealership and get a new ignition cylinder, and a quick reprogram of the PCM or ECU to get it going again. (Pricey)

SOURCE: 2000 chevy express 1500 van having starting issues

Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor

SOURCE: 2002 express 1500 van, will not start

remove dog house locate test port and install guage should be 45-60 psi

SOURCE: is there a fuel pump reset switch for 1999 pontiac montana?and where is it?

It is a very well know fact, that only Ford
Products, have ever had a Fuel Safety Shut Off Switch