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Fuel System Testing – Fuel Pump – Injector – Regulator – Relay – Sensor
Common Fuel Delivery Systems
So, The (PCM) commands the fuel pump to; apply 35-65 psi of fuel pressure to the injectors. Consequently, By grounding the primary fuel pump relay circuit.
One And Two Line Fuel Delivery Systems:
- On two-line fuel delivery systems. So, an external vacuum-modulated fuel pressure regulator controls the fuel pressure. Consequently, The two-line fuel delivery system; returns excess fuel to the tank using a return line.
- In contrast, On a single-line fuel delivery systems. So, an internal non-modulated fuel pressure regulator; in the fuel pump module controls the fuel pressure. But, The single-line fuel delivery system uses the same line.
Finally, Most conventional fuel delivery systems; include a Schrader valve at the fuel injector rail. Furthermore, allowing for mechanical fuel pressure testing.
When the ignition switch is turned on; the fuel pump is activated. So, It does this for several seconds to prime the fuel injectors. The fuel pump activates again during cranking. But, deactivates when the ignition key is released. When the crankshaft position (CKP) sensor; indicates to the (PCM) that the engine is running; the (PCM) continues to activate the fuel pump relay; without input from the ignition switch.
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