What color is the power wire to the fuel pump?

What color is the power wire to the fuel pump?

Been there Done it On the other hand the power to the pump is almost always gray, grey, a shade of very light black whatever you want to call it. The gas gauge is almost always purple, lavender, lilac, mauve, periwinkle, plum, violet, or some such name.

How do you test a GM fuel pump relay?

How to test a fuel pump relay

1. Park the car in safe and level ground.
2. Step 2: Turn the ignition key in the ON position but don’t start the car.
3. Step 3: Raise the hood and locate the fuel pump relay.
4. Step 4: The fuel pump relay will emit a clicking or buzzing sound when turning the key in the ON position.

What triggers the fuel pump relay?

The fuel pump relay is usually controlled by the ignition or powertrain control module, and when switched on, will provide current to the fuel pump so that it may function.

What wires are positive and negative on a fuel pump?

Electrical Connections 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.

Which wire is positive on a fuel pump?

The black is the ground, blue is the positive. It’s mentioned in the 5th page of this fuel pump rewire article.

Is it OK to bypass fuel pump relay?

Registered. Jumpering or bypassing the fuel pump relay puts a constant +12VDC to the fuel pump. Basically you have voltage directly from the battery to the fuel pump, even with the engine turned off. You could use a jumper assembly with a toggle switch to manually turn on and turn off the fuel pump.

Which fuse is the fuel pump relay?

Under the Hood One of the small, black relays is likely to control the fuel pump. Near the relay there is also typically a red, 10-amp fuse labeled “FUEL,” “F/P” or “FUEL PUMP.” If not, check under the dashboard.

Can ignition switch cause no power to fuel pump?

Car not starting: Another symptom of a faulty ignition relay is a no power condition. If the relay fails it will cut off power to fuel pump and ignition system, which will result in a no power, and therefore no start condition.

Where are the fuel pump and AC relays located?

The AC relay is located in the same under-hood fuse/relay box the fuel pump relay is in (see illustration above). Locate the fuel pump and AC compressor relays in the under-hood fuse and relay box. Swap the relays .

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.

What is the PSI of the fuel pump?

If the fuel pump relay IS NOT activating the fuel pump, the fuel pressure test gauge will register 0 PSI when cranking the engine. If the fuel pump relay is activating the fuel pump, then it’ll register about 56-62 PSI even if the engine does not start.