Does the computer control the fuel pump?
The ECM powers the pump through the fuel pump relay as long as reference pulses are received from the distributor, which means as long as the engine is running. Loss of oil pressure won’t stop the engine.
Is the fuel pump powered by the PCM?
Fuel pumps themselves don’t know when to shut off. They are entirely dependant on the fuel pump relay to provide them with power or remove their power. The fuel pump relay is controlled by the PCM by providing the relay with a ground. The PCM chooses to turn the relay on when it sees the motor is running.
How do you Diag a fuel pump?
Listen for the fuel pump: Put your ear near the fuel tank and have an assistant turn the ignition key to the “on” position. The fuel pump should make an audible noise if it’s working properly. Whack the fuel tank: Have an assistant crank the engine while you hit the fuel tank with a rubber mallet.
What does the fuel pump connect to?
Because it is connected to the camshaft, the discharge pressure of these pumps is constant, but the rate at which it pumps is directly correlated to the revolutions per minute (rpm) of the engine. Both pumps create negative pressure to draw the fuel through the lines.
What kind of wiring do you need for a fuel pump?
At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU. Choosing a Relay The relayyou need should be a four-prong relay with at least 14-gauge wiring.
How do you wire a fuel pump relay?
Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. This 12v wire will now energize the relay to turn on. So now instead of the stock ecu energizing the fuel pump, it will energize this relay.
How does the wiring of the fuel pump affect the car?
The factory wiring of the fuel pump is tied in with many other parts of the cars electrical system. If there are any fluctuations in voltage in this system, the fuel pump will also be affected. Just think about when you have the radio turned up, or running the high beam lights, or maybe when the alternator starts to weaken.
Why do I need a 14 Volt fuel pump?
The purpose of this is to make sure that the fuel pump is getting a good, clean voltage that won’t fluctuate or change based on other electrical conditions the car is going through. What I am saying is that we want to make sure that our fuel pump is receiving 14 volts when in use to be sure that our fuel pump is working as efficiently as possible.