Where is the AMP probe on a fuel pump?
The amp probe clamp can be placed at any point in the fuel pump circuit, as long as it’s in series between the voltage supply and the ground for the load. Clamp the probe to one of the pump wires, if it’s accessible. Or clamp it around the pump’s power wire at the fuse box, at a relay or inertia switch or at an underhood test connector.
When is the fuel pump relay turned on?
The fuel pump relay is activated whenever the ignition is turned on. A fuel pump relay functions primarily to maintain a consistent voltage supply to the fuel pump. The ignition or powertrain control module (PCM) usually controls the fuel pump relay.
Is the fuel pump relay controlled by the PCM?
Consequently, the fuel pump relay is usually controlled by, the ignition or powertrain control module (PCM). As a result, when switched on, the fuel pump relay; will provide current to the fuel pump, so that it may function. Therefore, any faults with it, can cause fuel pump issues.
How many amps does a PFI fuel pump draw?
High-pressure pumps, like those in port fuel injection (PFI) systems (35 to 45 psi), require more current than low-pressure pumps in throttle body injection (TBI) applications (9 to 13 psi). A TBI pump may have a normal current draw as low as 3 to 5 amps, with PFI pumps pulling 4 to 6 amps on average.
Where is the test light on a fuel pump?
You should be able to find the wire near the fuel tank located in the wiring harness. Now, get a test light. Then you need to probe the wire. If the test light illuminates but there is no pressure, it means the pump is faulty. When the engine runs, the pressure will drop to 52 psi.
How to test a fuel pump with a multimeter?
Hold the multimeter probes against the other 2 prongs on the relay. Plug the multimeter probes into the ports on the bottom of the machine so you can use them for testing. Hold either of the probes against one of the prongs labeled with 30 or 87. Then press the second probe against the last prong on the relay.
Do you need to test your fuel pump relay?
Buying a car is a tremendous investment, so when your gas mileage becomes an issue, you want to take it seriously. While there could be several causes for hard or not starting a failing fuel pump relay is one of them. You can spend money to have someone else test your fuel pump relay, or you can test it yourself.
The amp probe clamp can be placed at any point in the fuel pump circuit, as long as it’s in series between the voltage supply and the ground for the load. Clamp the probe to one of the pump wires, if it’s accessible. Or clamp it around the pump’s power wire at the fuse box, at a relay or inertia switch or at an underhood test connector.
Where is the test point for a fuel pump?
Hook the pressure gauge to the fuel pump test fitting. Locate your fuel pump test point, which is usually near the fuel injectors, and locate the point at which the pump hooks up with the filter injector rail. There should be a separation joint or a test port, where the pressure gauge attaches.
How to test a fuel pump relay with a multimeter?
1 Turn off your vehicle and remove the key from the ignition. 2 Find the fuel pump relay in your vehicle’s fuse box. 3 Pull the relay straight out from the fuse box to remove it. 4 Clean the relay prongs with a wire brush. The fuel pump relay may be faulty or have a loose connection if it’s developed any rust or corrosion on the
How can I check if my fuel pump is working?
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. 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. If this looks alright, then perform a fuel pressure test.