what shuld i do i cannot trust any one i paid 400.00 for the new fuel pump can you tell me what to check?
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2008 Hyundai Elantra Question: My car was always stalling and my fuel pump was replaced and now my car is dead.
Answer #1patrick mannion from Greg Solow's Engine Room, July 07, 2011, 21:13Master
It is hard to diagnose an intermittent fault but when your car is in a failed state it should be easier to determine what is wrong, assuming the battery is sufficiently strong enough to crank over the engine and the engine has mechanical integrity (ie can develop compression all components in the engine are in synchronization with each other), I would look to see if the engine has lost fuel or spark. Check for fuel pressure (you will need a fuel pressure gauge and look up the specified fuel pressure for your vehicle). Remove the fuel hose that goes to the fuel rail and get a friend to crank over the engine to see you have adequate fuel volume (you should have approximately 1 pint of gasoline in ten seconds of cranking). Off course take proper precautions as gasoline is highly flamable. Next "listen" to the fuel injector. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear "click, click, click" as the injector is electrically opened and closed by the computer. If the injector is not being triggered you will not have fuel getting into the engine's cylinders. Disconnect the electrical connector at the fuel injector with the ignition key in the "on" position, (next position after the accessory position) you should have 12 volts at one of the two wires at the injector. This true for most vehicles but you need to consult a workshop manual for your vehicle to see that this is true for your vehicle. When the engine is running the second wire at the injector gets (triggered) grounded by the computer in your vehicle many times a second controlling exactly when and how much fuel gets injected into the engine. Check for spark at the spark plug end of the ignition coil. Both fuel and spark share common sensors that can cause failure of both systems at once. Cars are complex unfortunately but with the car failed it should be easy to figure out. Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out www.hmaservice.com lots of great information.There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online