What happens when the fuel pump relay is off?
What happens when the fuel pump relay is off?
When the fuel pump relay is off (not activating the fuel pump), the high current circuit is ‘open’. In it’s ‘open’ state current does not get sent to the fuel pump. The low current circuit is the control circuit that ‘closes’ or ‘opens’ the high current circuit.
Why does my Ford pickup have a green relay?
You’ll be able to find out if the fuel pump relay, or the fuel pump Inertia Switch, or the fuel pump is the cause of the No Start Condition on your Ford car or pickup. If your fuel injected Ford pickup, van, or car still has the Ford relay, this bad boy will be a green color (like the one in the image viewer).
How many wires does a Ford fuel pump relay have?
The Ford fuel pump relay has 4 wires that connect to it. Each wire has a specific job to do and these are their circuit descriptions: IMPORTANT: Your specific Ford vehicle may not have the exact same colors listed below. This is no big deal, since the circuit descriptions are the same.
Where does the voltage come from in a fuel pump?
This voltage comes from the EEC Power relay. Power (in the form of 10 to 12 Volts) is applied to circuit 4 . This voltage comes from the ignition switch. The fuel injection computer then grounds circuit 1. This activates the fuel pump relay to pass current from circuit 4 to circuit 3.
What happens when the fuel pump relay goes bad?
If the fuel pump relay suddenly fails, it will light up the check engine light and store a trouble code on the fuel pressure. The fuel pump relay going bad can affect the fuel pump’s power and affect fuel delivery to the engine.
You’ll be able to find out if the fuel pump relay, or the fuel pump Inertia Switch, or the fuel pump is the cause of the No Start Condition on your Ford car or pickup. If your fuel injected Ford pickup, van, or car still has the Ford relay, this bad boy will be a green color (like the one in the image viewer).
What does a green fuel pump relay look like?
If it has already been replaced with an after-market one, this relay won’t be green, but will have a gray body. The following tutorial may be of help: How To Test The Fuel Pump (Ford 4.9L, 5.0L, 5.8L) (at: troubleshootmyvehicle.com ).
The Ford fuel pump relay has 4 wires that connect to it. Each wire has a specific job to do and these are their circuit descriptions: IMPORTANT: Your specific Ford vehicle may not have the exact same colors listed below. This is no big deal, since the circuit descriptions are the same.
Is the Ford fuel pump relay a green color?
If your fuel injected Ford pickup, van, or car still has the Ford relay, this bad boy will be a green color (like the one in the image viewer). If it has already been replaced with an after-market one, this relay won’t be green, but will have a gray body.
What happens if you tripped the fuel pump relay?
If the Inertia Switch has been tripped, it will ‘open’ the circuit and the voltage will not reach the fuel pump. As you can see, there’s really nothing complicated happening behind the scenes with the fuel pump relay and the way it activates the fuel pump when you turn the Key On and start cranking the engine.
If your fuel injected Ford pickup, van, or car still has the Ford relay, this bad boy will be a green color (like the one in the image viewer). If it has already been replaced with an after-market one, this relay won’t be green, but will have a gray body.
This voltage comes from the EEC Power relay. Power (in the form of 10 to 12 Volts) is applied to circuit 4 . This voltage comes from the ignition switch. The fuel injection computer then grounds circuit 1. This activates the fuel pump relay to pass current from circuit 4 to circuit 3.
