A car s fuel pump relay turns on the fuel pump when the motor runs.
How do u check fuel pump relay.
Consult your owner s manual or a service manual to find the location of your fuel pump relay.
The car acts.
Step 2 remove the fuel pump relay.
So any faults with it can cause fuel pump issues.
Generally there are four pins terminals on the fuel pump relay.
The main fuse box is usually located underneath the hood near the front of your vehicle but there may be a smaller fuse box under the steering column inside your vehicle as well.
Pull the cover off of the fuse box and look at the diagram printed on it to know where the fuel pump relay is.
A fuel pump relay functions primarily to maintain a consistent voltage supply to the fuel pump.
When a relay is defective it is usually because of a bad coil or bad connection.
Before you check your fuel pump find the fuse that corresponds to the pump and pull it out to see if it is broken or burned.
Step 3 identify the components.
The ignition or powertrain control module pcm usually controls the fuel pump relay.
To check both operations remove the relay by pulling it out of its socket.
Replacing the fuel pump relay may not fix the problem because the source of the trouble may be the fuel pump.
Find the fuel pump relay in your vehicle s fuse box.
If it looks fine check the voltage at the pump itself to make sure the charge that s leaving the fuse gets to the pump.
Place it on a work surface.
The fuel pump turns on but fuel pressure is low.
Unplug the fuel pump relay but do not break the cover and connecting tabs.
If this looks alright then perform a fuel pressure test.
It is often found in the fuse box located in the engine bay and.
One is for input voltage one is the ground pin one is the load pin that goes to the fuel pump and.
Acceleration is uneven this is also a sign of a bad fuel filter so have the fuel filter checked first in this case.
A relay works in a similar way but instead of you reaching into the relay to flip on the internal switch directly you energize a control circuit that connects to a coil inside the relay this happens to the fuel pump relay when you turn the ignition switch to fire up the engine for instance.
Here are some common signs of a faulty fuel pump.
