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Tuesday 31 May 2016

Electric Fuel Pump

Automotive Electronic Fuel Pump


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how do I do it right?
The easiest way is to use an oil pressure switch. The switch will stop the pump whenever the oil pressure in the engine goes away. So, whenever the engine is off, the pump will turn off automatically.
Some switches just do that. But how do I get the pump to run when I'm trying to start the motor and the oil pressure's not up yet?
You use a three prong switch like this Standard Ignition PS-64:

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The switch will also let the pump run when you hit the starter because the engine doesn't have oil pressure yet.
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One wire goes to the pump, one to the start circuit, and the other to the ignition circuit. So, when there is no oil pressure, the switch connects START to PUMP, and as soon as you start cranking it runs the pump. When the oil pressure comes up, the switch connects IGN to PUMP, for normal running. When oil pressure goes away (because you just hit that rock and tore the pan off the engine, for example) it again connects START to PUMP, and disconnects IGN from PUMP, so the pump shuts off.

-How should you wire an electric fuel pump?
Since you need the fuel pump back by the tank and at the same level as the fuel or lower, that usually means you're going to have a long run of wire. So, you need to have really good wiring going back to it. Wiring that will carry enough current. Running the current through your ignition switch isn't a good idea since it's probably already overloaded, and will kill the voltage. That will kill the pump. However, it's nice for convenience. That's why a relay is really good to use.
It lets the ignition switch activate the pump, while keeping the power from having to run through it. It will keep your pump alive and happy because it is getting full voltage. A good way is to mount a relay beside a power distribution block on the firewall (see Improved Power Circuit) and get the power from there.

Here is a diagram on how to wire and plumb your pump:
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Basic Automotive Circuit Wiring Diagram

Car Circuit Wiring Diagram Theory


Cars 12volt Wiring Diagram


Basic Electrical Theory:

For any 12 volt, negative ground, electrical system to operate, the electricity must travel in a complete circuit. This simply means that current (power) from the positive (+) terminal of the battery must eventually return to the negative (-) terminal of the battery. Along the way, this current will travel through wires, fuses, switches and components. If, for any reason, the flow of current through the circuit is interrupted, the component fed by that circuit will cease to function properly.
Perhaps the easiest way to visualize a circuit is to think of connecting a light bulb (with two wires attached to it) to the battery-one wire attached to the negative (-) terminal of the battery and the other wire to the positive (+) terminal. With the two wires touching the battery terminals, the circuit would be complete and the light bulb would illuminate. Electricity would follow a path from the battery to the bulb and back to the battery. It's easy to see that with longer wires on our light bulb, it could be mounted anywhere. Further, one wire could be fitted with a switch so that the light could be turned on and off.
See Figure 1
Click image to see an enlarged view
Fig. Fig. 1: This example illustrates a simple circuit. When the switch is closed, power from the positive (+) battery terminal flows through the fuse and the switch, and then to the light bulb. The light illuminates and the circuit is completed through the ground wire back to the negative (-) battery terminal. In reality, the two ground points shown in the illustration are attached to the metal frame of the vehicle, which completes the circuit back to the battery
The normal automotive circuit differs from this simple example in two ways. First, instead of having a return wire from the bulb to the battery, the current travels through the frame of the vehicle. Since the negative (-) battery cable is attached to the frame (made of electrically conductive metal), the frame of the vehicle can serve as a ground wire to complete the circuit. Secondly, most automotive circuits contain multiple components which receive power from a single circuit. This lessens the amount of wire needed to power components on the vehicle.

HOW DOES ELECTRICITY WORK: THE WATER ANALOGY



Electricity is the flow of electrons-the subatomic particles that constitute the outer shell of an atom. Electrons spin in an orbit around the center core of an atom. The center core is comprised of protons (positive charge) and neutrons (neutral charge). Electrons have a negative charge and balance out the positive charge of the protons. When an outside force causes the number of electrons to unbalance the charge of the protons, the electrons will split off the atom and look for another atom to balance out. If this imbalance is kept up, electrons will continue to move and an electrical flow will exist.
Many people have been taught electrical theory using an analogy with water. In a comparison with water flowing through a pipe, the electrons would be the water and the wire is the pipe.
The flow of electricity can be measured much like the flow of water through a pipe. The unit of measurement used is amperes, frequently abbreviated as amps (a). You can compare amperage to the volume of water flowing through a pipe. When connected to a circuit, an ammeter will measure the actual amount of current flowing through the circuit. When relatively few electrons flow through a circuit, the amperage is low. When many electrons flow, the amperage is high.
Water pressure is measured in units such as pounds per square inch (psi); The electrical pressure is measured in units called volts (v). When a voltmeter is connected to a circuit, it is measuring the electrical pressure.
The actual flow of electricity depends not only on voltage and amperage, but also on the resistance of the circuit. The higher the resistance, the higher the force necessary to push the current through the circuit. The standard unit for measuring resistance is an ohm. Resistance in a circuit varies depending on the amount and type of components used in the circuit. The main factors which determine resistance are:


Material-some materials have more resistance than others. Those with high resistance are said to be insulators. Rubber materials (or rubber-like plastics) are some of the most common insulators used in vehicles as they have a very high resistance to electricity. Very low resistance materials are said to be conductors. Copper wire is among the best conductors. Silver is actually a superior conductor to copper and is used in some relay contacts, but its high cost prohibits its use as common wiring. Most automotive wiring is made of copper.
Size-the larger the wire size being used, the less resistance the wire will have. This is why components which use large amounts of electricity usually have large wires supplying current to them.
Length-for a given thickness of wire, the longer the wire, the greater the resistance. The shorter the wire, the less the resistance. When determining the proper wire for a circuit, both size and length must be considered to design a circuit that can handle the current needs of the component.
Temperature-with many materials, the higher the temperature, the greater the resistance (positive temperature coefficient). Some materials exhibit the opposite trait of lower resistance with higher temperatures (negative temperature coefficient). These principles are used in many of the sensors on the engine.

OHM'S LAW



There is a direct relationship between current, voltage and resistance. The relationship between current, voltage and resistance can be summed up by a statement known as Ohm's law. Voltage (E) is equal to amperage (I) times resistance (R): E=I x R Other forms of the formula are R=E/I and I=E/R
In each of these formulas, E is the voltage in volts, I is the current in amps and R is the resistance in ohms. The basic point to remember is that as the resistance of a circuit goes up, the amount of current that flows in the circuit will go down, if voltage remains the same.
The amount of work that the electricity can perform is expressed as power. The unit of power is the watt (W). The relationship between power, voltage and current is expressed as: Power (W) is equal to amperage (I) times voltage (E): W=I x E. This is only true for direct current (DC) circuits; The alternating current formula is a tad different, but since the electrical circuits in most vehicles are DC type, we need not get into AC circuit theory.

Aftermarket Turn Signal Wiring Diagram

Generic Wire diagram For Turn Signals

aftermarket signal systems

Aftermarket Signal Wiring

Ford 2003 Fuse Box

2003 Ford Taurus Fuse Box Diagrams And Details

Clutch relay,pcm relay,accessory relay,blower motor relay,flasher relay,defrost relay,starter motor,cig lighter relay/fuse,Airbag module,pats tranceiver,

2003 Fuse List

Image:2003_fuse_Page01.jpg Image:2003_fuse_Page02.jpg Image:2003_fuse_Page03.jpg Image:2003_fuse_Page04.jpg Image:2003_fuse_Page05.jpg

1999 Ford Taurus Fuse Box

Ford Taurus Fuse Box Details And Diagrams


The details shown below for fuse,fuse box,relay,
headlight fuse,taillight fuse,driver side window fuse,starter relay ,pcm relay,tail lamp fuse etc etc

1999 Fuse List

Image:99fuse_01.png Image:99fuse_02.png Image:99fuse_03.png Image:99fuse_04.png Image:99fuse_05.png Image:99fuse_06.png

1996 Ford Underhood Fuse Box Details And Diagrams

Ford Engine Fuse Box Diagrams


1996 & 1997 Underhood Fuses

[img]Engine_fuse_panel_1_Gen_3.gifEngine_fuse_panel_2_Gen_3.gif
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[img]Engine_fuse_panel_3_Gen_3.gif


1996 & 1997 Interior Fuses


[img]IP_fuse_panel_1Gen_3.gif[/img]
[img]96Dash_Fuse_Panel2.gif[/img]
[edit]

1999 Fuse List

Ford Taurus Fuse Box Layout With Diagrams

Ford Taurus Fuse Box

1986-1995 Fuse Panel Layout

Image:FuseDiagram.png


1991 Fuse List

Image:91Fuse01.png Image:91Fuse02.png
[edit]

1995 Fuse List

Image:1995HighCurrentFuse.png Image:95Fuse.png


Ford Taurus Fuse Box Diagram

1996 & 1997 Underhood Fuses

Engine_fuse_panel

Car Fuse Box,Car Relays,Car Ignition Switch Wiring And Fitting

Fuse Relay Ignition Switch Wiring Details With Diagrams


Fuse Panel, Ignition Switches, Etc... How to Wire Stuff Up Under the Dash.

How do you wire up the fuse panel? What do you need to do to the dash? How's the ingition switch fit into all this?
First you have to figure out what you've got to work with. Are you using an original ignition switch? Is it from an older car? Or are you starting from scratch and have a new universal ignition switch?
If you still want to run the original switch, it's probably not capable of carrying enough current for modern needs without seriously limiting the the voltage or burning out all together.
However, there is a way to keep it and still use it to power everything. That's right, our old friend the relay.
The relay is just an industrial sized switch. With it the older ignition switch can still be used, but now it will simply turn on and off the relay which takes hardly any juice at all... And it's simple to do:
oldswitch
Now if you have a newer style switch, they're capable of handling much more current. However, if you're running lots of accessories, then you still may want to run a relay.
Now, to wire up your fuse panel, look at the following diagram. Note that only one wire power wire can run a few circuits on the fuse panel. You use jumper wires. Some aftermarket ones come with them, and others you just make your own.
fusepanel
Now, for a simple system with basic accessories and a newer switch, here's a good way to get wired up:
underdash
While this isn't the only way to go about wiring up under the dash, it's a good safe way that won't burn your car down. Every circuit is seperate and every one is fused. It also makes chasing down a problem much easier.