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There is a problem with the fuel system that prevents the fuel pump from working. the fuel pump is replaced. the wires are hot goin to the fuel pump but for an unknown reason the fuel pump will not operate. what are other options to try?
Re: There is a problem with the fuel system that prevents...
You should have 2 fule pump relays Oldsmobile uses a fails safe (some models). located on the oil sending unit, that is if you are equipt with this type, you are going to have to re inspect the fuel pump installation itself,there is a problem with your ground wire,just because the fuel pump runs off of a ground does not mean use body ground you will burn the relay.The fuel pump will have Positive + and ECM -, (from the relay). There is one ground going to the body of the pump, so you definetly will have to reinspect your installation,
i've replaced the battery in my 1993 cutlass cierra and for some reason every other day I have to charge the new battery. when i turn the car off i can still here something still running. could it be a bad relay staying powered up?i've replaced the battery in my 1993 cutlass cierra and for some reason every other day I have to charge the new battery. when i turn the car off i can still here something still running. could it be a bad relay staying powered up?
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Ran a hot wire to what fuel pump or the control module ? Which of these is yours ?
Figure 9: Fuel Controls - Fuel Pump Controls (LY6)
Figure 10: Fuel Pump Flow Control Module (Except LY6) Does yours have fuel pump flow control module under the vehicle Fuel Pump Flow Control Module (except LY6)
Mounted to the left side of the frame assembly below the driver seat ?
Fuel Pump Flow Control Module (FPCM) - LMF
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a 25 KHZ PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal. Maximum current supplied to the fuel pump is 15 amps. A liquid fuel pressure sensor provides fuel pressure feedback to the FPCM.
Electronic Returnless Fuel System (ERFS) - LMF
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of fuel pump flow control module (FPCM). Desired fuel pressure is commanded by the engine control module (ECM), and transmitted to the FPCM via a GMLAN serial data message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control.
If your vehicle has this system check it for DTC'S - diagnostic trouble codes . Will take guess work out of it .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
DTC P0192: Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage
DTC P0193: Fuel Rail Pressure (FRP) Sensor Circuit High Voltage
DTC P0230: Fuel Pump Relay Control Circuit
DTC P0231: Fuel Pump Control Circuit Low Voltage
DTC P0232: Fuel Pump Control Circuit High Voltage
DTC P023F: Fuel Pump Control Circuit
The engine control module (ECM) supplies voltage to the fuel pump flow control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the FPCM supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
DTC P025A: Fuel Pump Control Module Enable Circuit . Ford Electronic Returnless Fuel System Diagnosis Part 1 this for ford but the GM system works the same . You'll need a wiring diagram so you know what wires are what . Free wiring diagrams http://www.bbbind.com/free_tsb.html
Your fuel pump is getting bad, you need to replace it as fast as you can. When temp is hot or you ride long distances the fuel pump is getting hot and looses pressure, when you let it cool for a while it may work again for a while, but no one can tell how long!! So my advise would be to replace it as soon as possible. Good luck. (remember the fuel pump is located inside the fuel tank, so to "prevent" overheating while you change it try to have at least 1/2 tank)
lets say you have power and fuel is pumping it goes from pump to fuel rails in one long line if fuel is at port on rail then ck injectors for hot and ground hot with key on ground with engine turning injectors get ground from ecm ,if no ground ck for bad ground wires then ck ecm ,. if no power to pump ck fuse and fuel pump relay and wire system. some times replacement parts are bad.
he was hooking a hot wire to the fuel pump. hes right your loosing power somewhere in the power supply to the fuel pump. it needs to be traced down to see where the power loss is. the short or loss of power could be anywhere in the line. hope this helps
It should be four wires. Gray is power to the pump, Purple is gauge control, and two black wires that are ground. You should have battery voltage on the gray for 3 sec. after the key is turned on. Did you replace the plug-in to the pump when you replaced the pump? The pumps usually come with new plugs
The GRAY wire i believe going to the fuel pump is the hot wire it should come on for 2 seconds with just the key in the on position this is were you should check voltage for 2 seconds then it will go away until you crank the truck.Your oil sending unit is behind your distributor that could be the cause .
The wire should not be hot until the relay is triggered. The relay does not get triggered until the ignition key is turned on. It will run for 3-5 seconds or until the system pressure it at max.
Check fuel pump fuse, remember fuse send power to relay and relay sends power to pump, Check power wires to pump and make sure FUEL PUMP FUSE IS GOOD if not replace and take care of this problem. Good luck and thanks for using FIX YA.
Check the positive side of the battery for a burnt fusible link. It looks like a wire but when it's over loaded if burns in half. Look at the pos. battery side of the starter solonoid you'll see a few of them there. Check your ignition module as well. This controls the coil and distributor and is mounted to the driver side inner fender.
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