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At the fuel pump, pink with lite blue tracer is voltage.
I looked at the fuel pump relay , there are two lite blue wires with orange tracer. I divide the relay into two sides, load side, has the arm with arrow head, that lite blue wire is voltage, you can see the fuse. The control side of relay is that coil looking symbol, that lite blue wire is ground controlled by computer.
How do you know there is no fuel to fuel rail ? Did you hook up a fuel pressure gauge ? Are the injectors firing ? Do you know how to test ignition system ? B+ voltage to the coils , test ground ? What size engine does yours have ? 2.0 - 2.4 or 2.5 l First place to start would be to check power , Check for B+ voltage at the dark green with orange stripe wire at the coil pack. , no voltage here , check the ASD relay . The ASD relay suppies B+ voltage to the coils , PCM etc... The fuel pump would work but not the injectors . ASD relay is located in the under hood fuse box , should have another one you could swop with it just to test it.
Hi, the pump should be getting battery voltage (gray and black/white wires at the pump) thru the fusible link and the orange wire to the relay. The relay is controlled by the ECM thru the positive relay coil signal on the green/white wire.You might want to check the ground connection of the relay coil on the black/white wire. If that's good, maybe the ground wire to the pump is bad.
If you turn on the key and you do not hear the pump in the tank running for two secounds ( the same time your warning lights on your dash light up and goes off) then 1 you need to replace the pump or 2 it has low voltage to the pump or 3 both. I just repaired a 1987 pioneer what you need to know is the pump requires 12v at the pump, however OEM has placed an inline ballast resistor located on the driver side front engine compartment near the hood latch that is made of white ceramic with two connection both wires are orange with a black stripe. A. Check the voltage on both sides of the resistor 12v in 12v out use a volt meater - to battery + to resister if no voltes check the relay the passenger side of the engine compartment ( there is 4 relays from front to back it is no. 2 from the battery) looks like a small blue box newer relays are black, if they do not click when the key is on then your CPU may be bad or fusible link is bad If you have voltage to the resister and you have 12v in and less than 12v out your next test will be at the rear connector to the pump, three wires close to the fuel filter using a volt meater check the black wire with the orange / black stripe if voltage is less than the voltage out of your resistor then there is a bad wire in the system and a new wire is required. confirm this by jumping the battery to the pump wire black to- and orange to + the pump should run. Note. running the pump with lower than 12v will damage the pump and cause it to fail! If the pump works you can check the fuel pressure on the fuel rail, remove the cap to epose the shearder valve (looks like the valve on your tires) depress the valve stem and fuel should come out, caution fuel is under pressure have a rag under the valve to catch the fuel, if low pressure the pump is bad and/or filter is plugged Replace filter first recheck this test then replace pump and recheck. Note!!! when the pump is out of the tank recheck the voltage at the pump this will show true voltage at the last connector it needs to be 12 volts! Reconnect the pump wire the stock wire and check, on the pioneer I worked on was 4 volts so I rewired it to a new battery source using the orange /black strip wire that had 12v in to resistor as a trip wire for a 65 amp power relay. The owner noted an increase in overal performance " it now has more power now" hope this helps
First of all you will only have voltage for 2 seconds after key is turned on from the fuel pump relay. after that when you begin to spin the engine over oil pressure then builds up and closes the contacts on the oil sending unit causing the fuel pump to stay powered up as long as it's spinning or it's crunk and running.
so while you check for power on the tan with white stripe at fuel pump , have someone bump the engine over, if you have power up until about 2 seconds after they let off the key then check ground to pump if it's ok then you'll need a fuel pump.
If you don't have voltage when it's spun over then check the red wire coming from the oil sending unit the same way you checked it at the fuel pump.
If you have voltage then check inline fuse beside the battery. if fuse is'nt blown then check for broken wire from there to fuel pump.
If you don't have voltage from red wire at oil sending unit then check for voltage on orange wire at sending unit, if you have voltage on the orange wire and not on the red wire while someone is spinning it over then replace the oil sending unit.
If you wanna do a quick check that makes sure your relay isn't the problem Go to your 12 way diagnostic connector under dash by stearing wheel. and touch a battery hot wire to pin G if relay is ok the you should hear the fuel pump come on.
Many wires on most autos will have low voltage around 5 volts is common for wires going to most sensors. What you described with the fuel pump sounds normal for this truck. I would guess the fuel pump is not your problem cant say for shore with out any more info. I am unclear as to what the symptoms are, is the truck not starting. What led you to check the fuel pump. Did you check for spark.