Common questions

How can you test a fuel pump relay?

How can you test a fuel pump relay?

The easiest way to test a suspect fuel pump relay is to; swap the suspect relay with a good one. You may find another relay in your car with the same configuration as your fuel pump relay. Just make sure the other relay has the same configuration. Remove the suspect relay and install the good relay and check if your engine fires up.

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).

What should I test for a relay problem?

These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. There are two tests that should be considered when dealing with a relay problem, is the problem with the relay itself or is the problem a power or ground issue.

Which is the secondary side of the fuel pump relay?

Terminals 87 and 30 are the secondary side of the relay. Consequently, It acts as the “switch” that connects electrical current, from one terminal to the other. Use Jumper wires to supply 12v power to terminals 86 and 85. Next, use a test light on terminals 87 and 30, to see if you have power.

Where can I test my fuel pump relay?

Where To Buy The Fuel Pump Relay. TEST 1: Swapping Out The Fuel Pump Relay. TEST 2: Making Sure The Fuel Pump Relay Has Power. TEST 3: Bypassing The Fuel Pump Relay. TEST 4: Bench Testing The Fuel Pump Relay.

Where do you put the test light on a relay?

With the relay in the configuration that has the 2 load pins connected, place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay. The automotive test light should light. Automotive test lights are available at auto parts stores and hardware stores.

What kind of fuel pump does a Chevy Tahoe have?

This tutorial will show you how to test the fuel pump relay on your 1997, 1998, 1999 Chevrolet/GMC full-size Pick Up, Suburban, Tahoe, or Yukon. It’ll also show you how to bench test the fuel pump relay in a step-by-step way to find out if it’s defective or not.

How do you test a four terminal relay?

Confirm the current carrying ability of the load connectors. With the relay in the configuration that has the 2 load pins connected, place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay.

What happens when you remove the fuel pump key?

When the key is removed from the vehicle, the fuel pump will continue to run. In this article & video the diagnosis and repair of the faulty internal fuel pump relay will be covered. If playback doesn’t begin shortly, try restarting your device.

What are the pins on a fuel pump relay?

The load or power circuit is the one with the load or accessory that becomes activated (fuel pump, radiator fan, headlights, horn). You’ll find that many car relays have a diagram stamped on the case itself to identify each pin or terminal with a number.

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

What to do if your fuel pump relay stops working?

Connect one lead to one of the power circuit pins, and connect the other lead to the other power terminal. If you hear a beeping sound, your fuel pump relay’s power pins have shorted. Replace the relay. You can test the fuel pump relay, along with many other parts in your car, with the cheap and handy multimeter. (Photo Source: carcody)

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 do you re-wire a fuel pump?

The steps of re-wiring your fuel pump are to first get to your fuel pumps wiring. 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.

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 to test and replace a fuel pump relay?

How to test and replace a fuel pump relay. The principles shown here apply to most vehicles. However, it’s best to check with your vehicle’s repair manual for testing parameters.This specific vehicle is a ’97 Nissan Maxima. — Choosing the best oil filter: Wix XP / Amsoil / Royal Purple..

Where is the blue wire in a fuel pump relay?

Locate the blue (with an orange trace) wire in the 40-way electrical connector (Figure 12). RELAY WIRE HARNESS 16. Cut the blue (with an orange trace) wire one inch (25 mm) from the 40-way electrical connector (Figure 13). 17.

The steps of re-wiring your fuel pump are to first get to your fuel pumps wiring. 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.

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 does a test light on a fuel pump do?

Consequently, It acts as the “switch” that connects electrical current, from one terminal to the other. Use Jumper wires to supply 12v power to terminals 86 and 85. Next, use a test light on terminals 87 and 30, to see if you have power. Finally, if the test light goes on the the problem lies somewhere else.

Why does my fuel pump make a noise?

This noise is the solenoid inside the relay pulling it shut to connect the two posts together. If your meter does not show continuity from the fuel pump pin and the battery pin, or if you do not hear a clicking from the fuel pump relay, you need to replace your fuel pump relay.

How do you connect an ohmmeter to a fuel pump?

Whether you are using an ohmmeter or multi-meter, you’ll need to set it to resistance mode. Connect your multi-meter or ohmmeter probes to the relay. One probe should connect to the pin that goes to the fuel pump, and the other should connect to the pin that goes to the battery.

What’s the best way to test a fuel pump?

If your multimeter only has 1 ohm setting, then turn the dial so the arrow points at that setting. If the multimeter has multiple ranges within the ohm setting, choose the lowest range possible to get the most accurate reading. You can buy a multimeter from your local hardware store.

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Ruth Doyle