how to wire a relay for fuel pump

I converted my truck from throttle body injection over to carburetion which required a modification to the fuel delivery. I dont have a diagram but I can describe it.

How To Wire An Electric Fuel Pump Roadkill Customs Electricity Automotive Repair Electrical Circuit Diagram

Fuel pump wiring for the RED circuit is generally going to carry a much higher current than the relay.

. Station pin 85 to the frame. No A relay is only used when you wish to add safety features. If youre not comfortable with electrical wiring tasks we recommend you have an experienced technician perform this service for you.

They are usually labeled 30 85 86 and 87. Then run a jumper wire from the negative terminal of your battery to a ground point on your vehicle. Fused 10 ga wire goes into post 30 on the relay with a jumper to post 86.

This will complete the circuit and allow power to flow directly to the fuel pump. You do know that when you connect the ECU to terminal 85 on the relay you should connect terminal 86 to 12V. Use the red fuel pump wire to stimulate the relay through pin 86.

Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. The relay should have 4 pins on it. Post 85 will go to a normally-open oil pressure switch.

Wiring in the Fuel Pump Relay. Late 80s and 90s Ford fuel pump relays seemed prone to failing on. Remove the back seat to access the fuel pump cover.

This 12v wire will now energize the relay to turn on. I did some research online and found a wiring schematic. Now reach under your back seats and undo the clips and 12mm bolts that hold the back seat in place.

How to rewire install fuel pump relay mod elec wiring diagram electric circuits with a should i use for volvo and page fiero hot wire instructions cis function ford windstar do it right lightning rodder testing technical another gm online re wires have harness kit 1999 2002 4 m20b25 r3vlimited forums dual question magnafuel part 1 1993 circuit. Wire pin 85 to a good ground on the car. 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.

The pin 30 has a direct connection to the battery. This video details how to add an electric fuel pump to your project. Joined Sep 2 2006.

To direct wire your fuel pump at first make the connections properly put your fuse close to the battery. Install an in-line fuse of 10-15 amps and attach it to pin 30 of the relay using 12-10 gauge wire. Therefore peradventure you wire your fuel pump to a fuse directly there is no need to use a relay.

The harness you pull off must be tested with a ohmmeter. If the battery goes dead in a few days of sitting it is likely the fuel pump is running. Locate pin 30 on the relay systemcircuit.

To do this youll need to disconnect the wire from the pump and connect it directly to the positive terminal of your battery. There will be no current through the relay trigger coil since the voltage is the same on both sides. Run a dedicated power wire from your battery to pin 30 4.

They are usually labeled 30 85 86 and 87. But then you will need to use a small current through the switches for the relay to last a reasonable number of years. Im installing an electric fuel pump and want to include in my circuit a Relay Circuit breaker Oil Pressure Safety Switch.

This is brand brand new so its not likely to be available at any retail outlets yet but you can call and order directly from Edelbrock. 2 Jul 26 2015. Pin 85 is the ground wire.

So now instead of the stock ecu energizing the fuel pump it will energize this relay. The relay should have 4 or 5 pins on it. We focus on making this modification along with a Classic Update kit but the process wo.

Find a 12V source suited to supplying at least 15 amps such as a terminal block on the firewall or directly to the battery. 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. That is to say an oil pressure switch that grounds when it has pressure.

This is a direct plug-and-play install that plugs right into the fuel pump lead connector. I have a few questions on the Oil pressure safety Switch I terminal where. Edelbrock Pro-Flo 4 Fuel Pump Relay Kit 3534.

The diagram is color coded per circuit and only a few things may need to be said. Locate pin 87 it comes from the relay and ends on the positive terminal on the battery. 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. In this video I show how a fuel pump relay works and how to bypass yours. 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.

I also show how to rewire your fuel pump for an upgraded fuel system or race car. Wire pin 86 of the relay to a 12v trigger. Out from post 87 goes a 10 ga or sufficient wire to the fuel pump.

Find a switched power source. 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. In this video Anthony goes over the basics of wiring up an electric fuel pump.

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