What are the terminals of a fuel pump relay?

Terminals 86 and 85 are the primary side of the relay. It utilizes an electromagnet to close (connect) the secondary electrical circuit inside the relay. As a result, This electromagnet is activated by a simple; power (+) and ground (-) much like a light bulb circuit.

How can I tell if my fuel pump relay is defective?

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. Contents of this tutorial: Before You Start Your Fuel Pump Relay Diagnostic. 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.

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 to test a GM 4.3L fuel pump?

More GM 4.3L, 5.0L, and 5.7L Tutorials. It’s very important that you start off your fuel pump relay diagnostic by first testing the fuel pump pressure with a fuel pressure test gauge. If the fuel pump relay IS NOT activating the fuel pump, the fuel pressure test gauge will register 0 PSI when cranking the engine.

How many terminals does a fuel pump relay need?

Once you know how to test a fuel pump relay, you can test other automotive relays without much trouble. You’ll find relays with three, five or even six terminals, though. On three terminal relays, the case itself may serve as the ground connection.

How does the fuel pump relay work in a Ford?

The fuel injection computer then grounds circuit 1. This activates the fuel pump relay to pass current from circuit 4 to circuit 3. Circuit 3 is the one that runs to the fuel pump (via the Inertia Switch) and delivers the voltage/current it needs to activate.

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 ).

How does an electric fuel pump pump work?

When the ignition is activated, the (PCM) energizes a relay that supplies voltage to all electric fuel pumps. The motor inside fuel pump starts to spin and runs for a few seconds to build pressure.

When do you need to replace a fuel pump?

If there is battery voltage, then the pump has failed and needs to be replaced. If there is no voltage, then further electrical tests must be done. Note: These electrical tests are only good for an electric fuel pump, providing you with important information about the fuel pump’s health.

Where are the fuel pumps in a car?

Generally you will find that electrical fuel pumps are located in the fuel tank in order to use the fuel in the tank to cool the pump and ensure a steady supply of fuel. Electric fuel pumps can be heard as a quiet whine or hum in most cars. Most fuel pumps are built to last a long time.

What do you need to know about wiring a fuel pump?

The first tip for wiring a fuel pump has to do with the electrical connections on the pump itself. Make sure you label the positive and negative (ground) wires on the fuel pump. This is a basic task you should always do when working with electrical components on your car to avoid being shocked, causing sparks, or frying components.

How do you replace a fuel pump in a car?

1. Remove the “fuel pump” fuse from the fuse block. 2. Crank engine — engine will start and run until fuel pressure in tubes is reduced. Engage starter for another 3 seconds to assure relief of any remaining pressure. 3. With ignition “OFF” replace fuel pump fuse. Unless this lines are disconnected. B. FUEL PUMP AND SENDER ASSEMBLY REMOVAL 1.

Is there a problem with the fuel pump relay?

If you notice a problem with your fuel pump, such as no noise coming from it or your engine not starting, there could be a problem with the fuel pump relay, which controls the electric current running through the pump. Luckily, fuel pump relays are easy to test and replace on your own.

Where is the connector on a Chevy fuel pump?

When you get the Delco replacement parts it comes with a new connector on the fuel pump side. The problem is the connector on the vehicle side of the harness. In the online Chevrolet repair manual I use, a Tech Tip states, the connector should be replaced with the fuel pump assembly.

What are the terminals of a fuel pump relay?