Incorrect fuel reading. Show different levels of fuel. Needle goes back and forth. Can you help?

Question edited for clarity.
Question moved to model category.

You need a new fuel level sending unit. It is in the fuel tank.

https://www.google.com/search?q=1993+chevy+1500+fuel+sending+unit

Video help
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If plans a fail,plan B drive 300 km. and fill up.

Hi James,
The most likely cause is the fuel sending unit. When they go bad, you start getting erratic readings. Hope that helps.

replace fuel level sending unit, very common problem with GM vehicles

This problemis always caused by a defective fuel level sensor. The level sensor islocated of course in the gas tank. To change the level sensor you must remove the gas tank from the truck.

all later model chevy vehicles are plagued with this problem it,s the fuel level sensor mounted on the fuel pump module inside fuel tank unfortunately on some models it,s only available with purchase of whole new fuel pump module that can run as much as $500.00 dollars for just the module not including labor to drop fuel tank and replace I encourage you not to waste time and money with aftermarket less expensive pump module assemblies not to knock any parts people but our shop just installed the 3rd napa fuel pump module in a 98 blazer because the new pump will not read correct amount of fuel finally it was replaced by a pump module assemblie from dealership at cost of $458.00 for pump it now reads correct hope this helps if you need more detailed instructions on how to replace repost at fix ya thanks

You will need to replace the fuel level sensor which is in the fuel tank.They have a lot of problems because the metal fingers on the sensor wear off and gives you the incorrect readings.This will also cause the check engine light to come on.You will probably have a level sensor code.This will be a lot easier if the fuel level is down to about a quarter tank or less.Also you should be able to get just the level sensor and not have to get the complete fuel pump module.Good luck.

You need to make sure all your wiring is good especially the terminals in the connectors.Check all the wiring from the front to the back where the connectors hook up.If you know someone with a scanner then you can usually do a sweep test on the gauge and it should show the level reading also.But not all scanners have this ability.If it shows the level reading on the scanner then this would eliminate the pcm.Because it is seeing the data.Throttle position has nothing to do with fuel level.Do you think you have a problem with the throttle position?

YOU NEED TO HAVE THE OIL PRESSURE SENDING UNIT REPLACED ON THE ENGINE.

it sounds like the level sensor on the sender (fuel pick up pipe in the fuel tank) is getting stuck. the level sensor is a float that is attached to the sender, and you will need to remove the fuel tank to get to it.

hope this helps.