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Fuel travels through a fuel line from the gas tank to an injection device located at the engine. Problems in the fuel system can very greatly. Safety first: check for any evident leaks in the fuel system.
The most common problem in the fuel delivery system is faults in the electrical components that drive the system. Common problems are: faulty fuel pump fuse, faulty fuel pump, or a clogged fuel pump or filter. Other problems may exist in the fuel injectors or carburetor. Check first to see that the fuel pump is responding when voltage is present (in an automobile, keyed ignition in the ON position, listen for a light "humming" sound at the location of the fuel pump. This should give you an idea where to begin. If a "hum" is present, that means the pump is operating. If no sound can be heard, first check the fuel pump fuse. If the fuse is in good condition, the fault is either in the fuel pump, or the wiring for the pump.
If the "hum" is present, check for signs of fuel at the engine: some vehicles are equipped with a Schroeder Valve at the fuel rail. When the valve is open and the ignition is ON, fuel should flow from the open valve. If pump is operating and no fuel flows from the open valve, check for possible leaks or clogs in the fuel line.
This is not a comprehensive list of every possible failure, but it should serve well as a starting point to your troubleshooting for automotive fuel delivery problems.
Also, never underestimate the knowledge of a local skilled mechanic. It might just be worth the hour labor to have someone else pinpoint the problem. Good luck and happy hunting!
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