how to wire a relay for fuel pump

Now reach under your back seats and undo the clips and 12mm bolts that hold the back seat in place. Fuel pump wiring for the RED circuit is generally going to carry a much higher current than the relay.

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As for the relay.

. The harness you pull off must be tested with a ohmmeter. 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. This is the basic wiring diagram for SAFE electric fuel pump wiring.

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. Wire pin 86 of the relay to a 12v trigger. Find a 12V source suited to supplying at least 15 amps such as a terminal block on the firewall or directly to the battery.

Post 85 will go to a normally-open oil pressure switch. Learn how this circuit works and how to wire the fuel pump How to do an alternator relay failure circuit A very clever circuit used as a warning to the driver when an impending alternator issue is at hand How to wire relay power door lock Power door locks have been around. Both can be used from the fuse box.

Current varies but most are between 75 and 150 mA. To make servicing easy we connected the pump power and ground wires with spade-type disconnect terminals. I have a few questions on the Oil pressure safety Switch I.

Out from post 87 goes a 10 ga or sufficient wire to the fuel pump. Im installing an electric fuel pump and want to include in my circuit a Relay Circuit breaker Oil Pressure Safety Switch. Wire pin 85 to a good ground on the car.

So now instead of the stock ecu energizing the fuel pump it will energize this relay. On the bottom side there are a set of 4 smaller wires that go to the sending unit. We drilled a small hole and used a grommet for protection to run the power wire to the pump itself.

On your stock pump hanger there is a white plug. That is to say an oil pressure switch that grounds when it has pressure. The correct current reading would be the lesser for correct polarity.

They are usually labeled 30 85 86 and 87. The forward voltage maximum is only 1V applying 12V will result in diode failure before the relay clicks. Find a switched power source.

Joined Sep 2 2006. 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. This is why you may get extended cranking on initial startup because the fuel pump relay is not working but the closing of the oil pressure switch once oil pressure is reached during cranking will allow fuel pump operation.

Remove the back seat to access the fuel pump cover. In our install we located the relay in the trunk for easy access. This 12v wire will now energize the relay to turn on.

If that is the case for the relay you need a constant 12 power and a key on power. Those can be used to switch your relay on and off then just run your power wire through the relay. If the battery goes dead in a few days of sitting it is likely the fuel pump is running.

I did some research online and found a wiring schematic. Wiring in the Fuel Pump Relay. Late 80s and 90s Ford fuel pump relays seemed prone to failing on.

Run a dedicated power wire from your battery to pin 30. Fused 10 ga wire goes into post 30 on the relay with a jumper to post 86. The relay should have 4 pins on it.

Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. Learn how this circuit works and how to wire the fuel pump How to do an alternator relay failure circuit A very clever circuit used as a warning to the driver when an impending. 2 Jul 26 2015.

In this video I show how a fuel pump relay works and how to bypass yours. Use a fuseable link somewhere in that power line you run. I dont have a diagram but I can describe it.

The fuel pump on this vehicle is an aftermarket in-tank pump. The fuel pump has gone bad an no replacement is available. Station pin 85 to the frame.

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. If you run a wire to the dark blueorange wire the pump should run. With a universal unit How to connect a fuel pump relay There are many instances where the fuel pump has gone bad an no replacement is available.

Inertia switches or roll over valves are often the means of shutting down fuel pumps in case of accidents. 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.

Install an in-line fuse of 10-15 amps and attach it to pin 30 of the relay using 12-10 gauge wire. Only show this user. A current limited 12V supply of about 250mA would enable safe testing.

This video details how to add an electric fuel pump to your project. Run a wire from pin 87 to the positive wire on your fuel pump. Use the red fuel pump wire to stimulate the relay through pin 86.

The diagram is color coded per circuit and only a few things may need to be said. We focus on making this modification along with a Classic Update kit but the process wo.

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