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Original-Beitrag von: F Dryer

Original-Beitrag von::

Electronic fuel injection can be troublesome for diyers unless familiar. With spark seen, leaves fuel to troubleshoot. Fuel injection; fuel pump fuse, injector fuse, fuel pump and filter. Check for blown fuses then verify a fuel issue by spraying starting fluid into the throttle body. If the engine starts up immediately then dies ( from lack of fuel), you know fuel is the problem. If possible, check for fuel pressure if a fuel test valve is mounted on the fuel rail with a borrowed fuel pressure gauge from Autozone (free loaner tools). No A-z? Try Advance Auto. Without a f/p gauge, simply have someone turn on ignition while you depress the schrader valve (same as tire valve); cover loosely with a rag and expect fuel to shoot out a powerful spray. No fuel spray suggests a clogged fuel filter or worn out fuel pump (it won't last forever). Some fuel pumps operate from a relay in the fuse box. Removing the f/p repay and examining labeling for pinouts can allow you to use a small length of wire to jumper across relay terminal socket  pins 30 and 87 (the switched contacts) to send 12v to power the fuel pump immediately regardless of ignition switch position, You may hear a quiet hum/hiss sound or place an ear onto the rear quarter panel and listen for fuel pump sounds,  Some if not all EFI fuel pumps may run only for a few seconds if ignition is turned on but engine isn't started - a safety issue. Once starting and running, the fuel pump runs until the engine's stopped.

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