how to wire a relay for fuel pump
Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. If the battery goes dead in a few days of sitting it is likely the fuel pump is running.
2003 Ford Mustang Fuel Pump Relay Location Wiring Diagram 174513 Amazing Wiring Diagram Collection 2003 Ford Mustang Ford Mustang Mustang
2 Jul 26 2015.
. You do know that when you connect the ECU to terminal 85 on the relay you should connect terminal 86 to 12V. Find a 12V source suited to supplying at least 15 amps such as a terminal block on the firewall or directly to the battery. Only show this user.
The fuel pump relay is a cube-shaped object found inside the engine compartment. If you run a wire to the dark blueorange wire the pump should run. To make servicing easy we connected the pump power and ground wires with spade-type disconnect terminals.
Those can be used to switch your relay on and off then just run your power wire through the relay. Use the red fuel pump wire to stimulate the relay through pin 86. The relay should have 4 pins on it.
So now instead of the stock ecu energizing the fuel pump it will energize this relay. The forward voltage maximum is only 1V applying 12V will result in diode failure before the relay clicks. This is the basic wiring diagram for SAFE electric fuel pump wiring.
Once you spot the fuel pump relay remove it carefully by removing the prongs that looks like electrical plug using a flat screw driver. As for the relay. Wiring in the Fuel Pump Relay.
Wire pin 85 to a good ground on the car. Station pin 85 to the frame. This video details how to add an electric fuel pump to your project.
Fuel pump wiring for the RED circuit is generally going to carry a much higher current than the relay. Run a dedicated power wire from your battery to pin 30. This 12v wire will now energize the relay to turn on.
Find a switched power source. The switch fail-safes the circuit because under normal running conditions the fuel pump cant operate if theres no oil pressure to energize the relay. GM used this three-prong oil pressure switch.
The large blue wire on the output of the fuel pump relay can be used to drive the pump as is and maybe you should simply use this relay for the fuel pump and run your other functions through the relay box. We drilled a small hole and used a grommet for protection to run the power wire to the pump itself. I did some research online and found a wiring schematic.
I also show how to rewire your fuel pump for an upgraded fuel system or race car. Next to those are a larger red and black. Now reach under your back seats and undo the clips and 12mm bolts that hold the back seat in place.
Wire pin 86 of the relay to a 12v trigger. Run a wire from pin 87 to the positive wire on your fuel pump. In our install we located the relay in the trunk for easy access.
Undo the 10mm hex screws here theres 4 total and remove the fuel pump access plate to expose the fuel pump and the wiring harness. Remove the back seat to access the fuel pump cover. However if you do want to control the pump through the relay box you can just use the large blue wire as a positive trigger and ground the.
The fuel pump on this vehicle is an aftermarket in-tank pump. There will be no current through the relay trigger coil since the voltage is the same on both sides. A current limited 12V supply of about 250mA would enable safe testing.
The basic components of an electric fuel pump are the positive and negative ground electrical terminals on the pump itself the fuel sending unit the relay switch for the pump and the fuse for the fuel pump in your vehicles fuse box. Electricity can be dangerous. That is to say an oil pressure switch that grounds when it has pressure.
Fused 10 ga wire goes into post 30 on the relay with a jumper to post 86. Step 2 - Remove The Pump. In this video I show how a fuel pump relay works and how to bypass yours.
They are usually labeled 30 85 86 and 87. We focus on making this modification along with a Classic Update kit but the process wo. The diagram is color coded per circuit and only a few things may need to be said.
I dont have a diagram but I can describe it. I have a few questions on the Oil pressure safety Switch I terminal where is the best. If that is the case for the relay you need a constant 12 power and a key on power.
Late 80s and 90s Ford fuel pump relays seemed prone to failing on. Please make SURE that the car battery is completely. Both can be used from the fuse box.
Out from post 87 goes a 10 ga or sufficient wire to the fuel pump. Use a fuseable link somewhere in that power line you run. Current varies but most are between 75 and 150 mA.
You do need an oil pressure or inertia switch or both wired into the system to shut the pump off in case of an accident or broken fuel line. For safety precaution wear a pair of working gloves in order to remove the fuel pump relay. Install an in-line fuse of 10-15 amps and attach it to pin 30 of the relay using 12-10 gauge wire.
Post 85 will go to a normally-open oil pressure switch. Im installing an electric fuel pump and want to include in my circuit a Relay Circuit breaker Oil Pressure Safety Switch. When active the voltage at the ECU output pin will be 0 voltswhen in-active pump off the ECU output will float and measure as 12V.
The harness you pull off must be tested with a ohmmeter. On the bottom side there are a set of 4 smaller wires that go to the sending unit. On your stock pump hanger there is a white plug.
The correct current reading would be the lesser for correct polarity.
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