The gas tank on your truck doesn't decide when the gas pump shuts off. It sounds like you think it's not as full as it is. Make sure your looking at the gas gauge instead of the temp gauge.
SOURCE: 2002Chevy Silverado 2500 HD Pick up - Security light staying lit...
on chevy the security is on the ignition cylinder not on the key so check the cylinder insteaf of the key question did you had an alarm installed on your vehicle?
SOURCE: Fuel Sending unit on a 2000 Chevy Silverado
if it is the fuel level sending unit you will have to replace the pump because they are a 1 piece assambly. it will be a task to change too as you will need to either remove the truck bed or drop the fuel tank to get to it.
SOURCE: Difficulty filling gas tank '06 Silverado 2500 HD 6.0 4x4 w/125K
Well come to the GM World. The filler tube to the gas tank is small and i find it to be the same on my Jimmy and my wife's Montana.
When filling, try starting off slow. Then gradually pull on the trigger more, as you fill the tank with gas. The fluid going in back's up with the air coming out. When you start off slow then pull on the trigger more you give the gas going in and air coming out time to create a path through that they can don't really interfere much with one another.
After a while you'll find a certain way (eather tilted to the left or right) to place the Gas pump nozzle in the filler tube to keep it from cutting off on you.
Good luck and hope this helps. If there is anything wrong with the EVAP. Charcoal canister, vacuum tubes or valve, your Service Engine light would go on. The ECM monitors all of that and would save a DTC in the ECM's memory to be retrieved by a technition's scanner.
SOURCE: 2004 Chevy Silverado HD 2500
On many engines with distributor less ignition systems and sequential fuel injection, a camshaft position sensor is used to keep the engine's control module informed about the relative position of the crankshaft. By monitoring cam position (which allows the control module to determine when the intake and exhaust valves are opening and closing), the control module can use the cam position sensor's input along with that from the crankshaft position sensor to determine which cylinder in the engine's firing sequence is approaching top dead center. This information is then used by the engine control module to synchronize the pulsing of sequential fuel injectors so they match the firing order of the engine. On some applications, input from the camshaft position sensor is also required for ignition timing.
The camshaft position sensor may be magnetic or Hall effect, and mounted on the timing cover over the camshaft gear, on the end of the cylinder head in an overhead cam application, or in a special housing that replaces the distributor (in the case of some of the GM applications). Operation and diagnosis is essentially the same as that for a crankshaft position sensor.
Re check the wire harness and the sensor installation to the camshaft sensor in Bank #1 which is where the #1 cylinder is. Good luck and hope this adds some light to you question, keep me posted and be glad to help.
SOURCE: Takes forever to fill gas tank on "04" silverado 2500 hd
it sounds like you have an obstruction in the filler tube or it may have colapsed take it off and replace it
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