The Chevy Impala was produced by Universal Motors from 1958 to 1985, 1994 to 1996 and was resurrected in 2000. The fuel development in the Chevy Impala revolves sorrounding the fuel pump. Signs of impaired fuel delivery append inflexible starts, engine stalls while driving and low potentiality. GM recommends you see the fuel step every 25,000 miles.
Instructions
1. Proceeds the fuel system coercion carefully. Loosen the bolt on top of the fuel filter in the Chevy Impala. Disconnect the negative battery cable and remove the fuel fill cap. Hold the bolt with a box wrench while holding the fuel filter with a second wrench. Loosen the bolt one full turn to release any fuel pressure.
2. Attach a two-hose fuel pressure test gauge line to the fuel pressure test connection. Place the second line into an approved container to discharge stray fuel.
3. Ask a helper to turn the ignition key to the first position but do not start the car. Watch the pressure gauge needle and record this as the first pressure reading.
4. Remove the vacuum line from the fuel pump pressure regulator and check for fuel. Refer to the owner's manual for the line's location if you aren't sure which one it is. There shouldn't be any fuel in the line. If there is, the engine problems are likely caused by a faulty fuel pump pressure regulator, which means the fuel is flowing back into the lines rather than into the engine and there is not enough fuel in the engine for it to function properly. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.
5. Reconnect the battery cable. Start the engine and let it idle as you remove the vacuum line again. Watch the pressure gauge. It needs to register between five and 10 pounds psi. If the needle doesn't move, the pressure regulator is malfunctioning and needs to be replaced.
6. Leave the engine on and watch the pressure gauge as a helper works the throttle. The gauge needs to register approximately five psi. If the needle moves down, the fuel pump is malfunctioning or the fuel filter is clogged.11. Check the fuel filter for leaks. Turn the ignition on for two seconds and then turn it off for 10 seconds.
Remove the quick connect fitting at the inlet of the filter. Remove the threaded fitting at the outlet of the filter with wrenches of the appropriate sizes.
8. Use a flathead screwdriver to remove the mounting bracket that holds the fuel filter in place. Remove the fuel filter from the Impala carefully as there is probably still fuel inside.
9. Inspect the filter visually for clogs and refit the Impala with a new filter if necessary. If the filter is in working order, the cause of the fuel delivery problem is a faulty fuel pump.
10. Replace the fuel filter or fit the Impala with a new filter. Connect the filter to the mounting bracket. Torque the bolt to 15 foot pounds (20 Nm). Attach the quick connect fitting to the inlet of the filter. Secure the threaded fitting to the filter's outlet side. Use a second wrench to torque the nut at the filter outlet to 22 foot pounds (30 Nm).
Turn the engine off and remove the pressure gauge.7. Remove the fuel filter and inspect it for clogs. Turn it on again and visually check for any leaking fluid. Turn the ignition off again and visually check for any leaking fluid.
