What are the pins on a fuel pump relay?
What are the pins on a fuel pump relay?
Wiring in the Fuel Pump Relay The relay should have 4 pins on it. They are usually labeled 30, 85, 86, and 87. Steps: 1. Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. This 12v wire will now energize the relay to turn on. So now instead of the stock ecu energizing the fuel pump, it will energize this relay.
Is there an ECM signal to the fuel pump relay?
The fuel pump relay works as it should. I always have power to Pin 30. I believe the ECM tells the relay to work via the green/black wire to Pin 85. This should happen for 2 seconds when the key is turned on. I have tested this when the issue is occurring and have confirmed that no signal is being sent from the ECM.
Why is my fuel pump relay not working?
Most of the time, if I leave the key in the On position, after several seconds to a few minutes, it will all of the sudden prime and the gauge comes alive. Then it will work for a few days until the next time it randomly doesn’t. I have ruled out the Passkey issue. The fuel pump relay works as it should. I always have power to Pin 30.
Where is the supply wire for a fuel pump?
At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU.
Where is the Chevy P30 fuel pump relay?
Well the book shows 3 places it could be. 1 where I already said, 2 under the doghouse on drivers side, 3 inside of the frame rail in the rear. The relay should have 4 but could have 5 or 6 wires in it. The orange wire is 12v power, black= ground, dk/grn/wht is switched power, gray goes to the pump.
The fuel pump relay works as it should. I always have power to Pin 30. I believe the ECM tells the relay to work via the green/black wire to Pin 85. This should happen for 2 seconds when the key is turned on. I have tested this when the issue is occurring and have confirmed that no signal is being sent from the ECM.
What is the voltage of the fuel pump relay?
From the positive battery terminal to Pin 85 measured 10.9 V. The battery from terminal to terminal measured 12.2 V. Everywhere else I’ve compared voltage has been the same as the battery. That seems a little suspicious.
Most of the time, if I leave the key in the On position, after several seconds to a few minutes, it will all of the sudden prime and the gauge comes alive. Then it will work for a few days until the next time it randomly doesn’t. I have ruled out the Passkey issue. The fuel pump relay works as it should. I always have power to Pin 30.
The relay should have 4 pins on it. They are usually labeled 30, 85, 86, and 87. Steps: 1. Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. This 12v wire will now energize the relay to turn on. So now instead of the stock ecu energizing the fuel pump, it will energize this relay. 2.
What kind of wiring do you need for a fuel pump?
At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU. Choosing a Relay The relayyou need should be a four-prong relay with at least 14-gauge wiring.
Why do I need to rewire my fuel pump?
When putting in an aftermarket fuel pumpor looking to get more fuel out of your factory pump, one mod worth doing is re-wiring that fuel pump. The purpose of this is to make sure that the fuel pump is getting a good, clean voltage that won’t fluctuate or change based on other electrical conditions the car is going through.
How does the wiring of the fuel pump affect the car?
The factory wiring of the fuel pump is tied in with many other parts of the cars electrical system. If there are any fluctuations in voltage in this system, the fuel pump will also be affected. Just think about when you have the radio turned up, or running the high beam lights, or maybe when the alternator starts to weaken.
How is a fuel pump connected to a relay?
4. Run a wire from pin 87 to your factory wire that you cut that runs to the fuel pump. Now to explain what you just did. The relay is just like a light switch. Anytime it receives 12 volts on pin 85, it will turn on the switch and make continuity between pin 86 and pin 87 on the relay.
How do you re-wire a fuel pump?
The steps of re-wiring your fuel pump are to first get to your fuel pumps wiring. At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU.
The factory wiring of the fuel pump is tied in with many other parts of the cars electrical system. If there are any fluctuations in voltage in this system, the fuel pump will also be affected. Just think about when you have the radio turned up, or running the high beam lights, or maybe when the alternator starts to weaken.
Why do I need a 14 Volt fuel pump?
The purpose of this is to make sure that the fuel pump is getting a good, clean voltage that won’t fluctuate or change based on other electrical conditions the car is going through. What I am saying is that we want to make sure that our fuel pump is receiving 14 volts when in use to be sure that our fuel pump is working as efficiently as possible.
How to install an external fuel pump relay?
Safety Recall P54 –Fuel Pump RelayPage 4 B. Install External Fuel Pump Relay 1. Position the passenger seat fully forward. 2. Open the battery access cover located under the passenger front seat and disconnect the negative battery cable (Figure 2). 3. Remove and save the Totally Integrated Power Module (TIPM) access cover.
Where is the 40 way wiring on a 14v fuel pump relay?
14. Carefully remove and save the 40-way electrical connector wire cover located on the wire side of the connector (Figure 11). NOTE: The plastic tie strap that holds the wire harness to the wire cover must be cut off and discarded (Figure 10).
What kind of ECM does a 1998 Dodge Ram have?
They utilized a VP44 injection pump which was electronically controlled by a Cummins 1 plug ECM P/N 3942336 (Engine Control Module)or FCM (Fuel Control Module) that mounts to the side of the block hence the terminology block mounted ECM. The 1998 & 1999 model years had issues with the “Wait To Start” Light not turning off.
What is wiring diagram for electric fuel pump?
First some good practices, one is proper wiring, fusing and using the right safety circuits to keep you and your car safe. This project will show 2 basic wiring diagrams for electric fuel pumps. One without a warning light one with. Some parts are optional like the inertia switch, but highly recommended.
Which is correct wiring diagram for Cummins 5.9 ECM?
Oct 29, · Correct Diagram Check this PDF for a reference that includes the alarm board you need to get a voltmeter out and trace the path from the engine where you can CONFIRM good stable voltage all the way up to the panel and volt meter gauges maybe the gauge itself is bad? CAUTION. The fuel system contains high pressure fuel up to 25, PSI.
The relay should have 4 pins on it. They are usually labeled 30, 85, 86, and 87. Steps: 1. Wire pin 85 of the relay to the 12v supply wire from the stock ECU that you just cut. This 12v wire will now energize the relay to turn on. So now instead of the stock ecu energizing the fuel pump, it will energize this relay. 2.
At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU. Choosing a Relay The relayyou need should be a four-prong relay with at least 14-gauge wiring.
The steps of re-wiring your fuel pump are to first get to your fuel pumps wiring. At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU.
What happens when a fuel pump relay goes bad?
Consequently, if the fuel pump relay has an issue, it will cut off power to the fuel pump. Also, if a relay overheats, the electrical contacts inside the relay can short circuit; causing the electrical flow to stop. However, when the relay contacts cool, it will resume the flow of electricity.
Is there any power to the fuel pump fuse?
Using a simple test light there is no power at all to the fuel pump fuse. Replaced the fuel pump relay just to be safe. Still no power to the … read more
Is there any power to the fuel pump relay?
Truck has sat for 6 mos or so. Has always started before. Using a simple test light there is no power at all to the fuel pump fuse. Replaced the fuel pump relay just to be safe. Still no power to the … read more
Where is the relay wire on a tipm fuel pump?
Using wire strippers, strip back about 1/4 inch of insulation to expose the wire. Cut the dark blue / orange wire at terminal 10. This is where the repair kit relay terminal 87 will connect. Working at the black 50 way connector locate the brown wire.
Using a simple test light there is no power at all to the fuel pump fuse. Replaced the fuel pump relay just to be safe. Still no power to the … read more
What kind of wire to use for fuel pump?
Working at terminal 38 pink / light green wire, use a small pick to unlock and hold the terminal lock while pulling the wire straight out of the connector. Using wire strippers, strip back about 1/4 inch of insulation to expose the wire. Cut the dark blue / orange wire at terminal 10.
