2003 express van 1500 w a 4.3 v6 93k miles ... Here's my problem bought the van it left me stranded fuel pump .. Returned and the rinky dink dealer replace it ... I filled the tank it read full started driving then it dropped empty w the light on...... I returned he took it out put it back it was fine read full then about 5 miles down the road it goes down.... Been driving for weeks drives fine besides a p0430 code... Don't kno if issues are related doubtful seeing how the float goes to the cluster ... Im goin crazy don't want to waste money in a new pump don't wanna deal w the dealer cause it wAs as is...finally I had the cluster examined and the little motor swpped by a professional .... No difference it never moves when filling up ... Only responds when the pump was freshly connected or reconnected for about twenty minutes ..... Driving me crazy .. I have a cross country drive in 3 days and need help ...pleeeeeaaassee...

SOURCE: fuel gauge faulty / gives weird levels of fuel

The fuel level sensor is bad. The tank will have to be taken down to replace the level sensor. There is little fingers on the resistor that wear down and loose contact causing the gage to read incorrectly.

SOURCE: 2002 express 1500 van, will not start

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

SOURCE: 2002 Chev Astro 4.3L

It sounds like the wiring harness that the fuel pump assembly plugs into. Check to see it there is a replacement one available.

SOURCE: motor turns over won't start.

Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they get loud or stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.
It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.

If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.