Question about 2003 GMC Envoy

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Foul pump problem no power.

I can't get no power to the foul pump I change fuse, relay, and ECM still no power but if I run a power to the pump it comes on.

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Check to see if you have a fuel pressure sensor in the fuel manifold . It is there to stop the pump working when the pressure in the manifold is held constant . IT sends to the ECM which in turn activates the pump relay and turns the pump on.

Posted on Mar 18, 2014

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2 Answers

1992 Ford E150 has no power to fuel pump, inertia switch good, relays good, new pcm i am lost.


the pressure regulator controls the power requirement to the fuel pump
when pressure is reached , it allows power/circuit to the ECM to be broken which in turn stops the pump relay from working
when the pressure drops , that circuit is energized and the ECM switches on the circuit , to the relay allowing power to the pump to supply fuel to get the pressure back up
for the circuit operation you will need a schematics of the electrics for the vehicle ( workshop manual) as some may not use the ECM but go straight from the pressure regulator to the relay through a fuse

Jun 14, 2017 | Ford Cars & Trucks

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1994. Why won't it start?


If the fuel pump/s continue to run with key on, suspect a relay issue. The relay is grounded by the vehicles computer. If the computer supplies a constant ground, the relay will continue to stay closed and power the fuel pumps constantly. If the the ground wire that comes from the computer to the relay is shorted/grounded, the relay will stay energized as well. As for the no start, are the injectors getting a power and ground supply? The ground side of the injector is controlled by the computer as well. Is the vehicle getting spark at the coil/plug? Have you scanned the computer for any trouble codes?

Nov 29, 2015 | Ford F-150 Cars & Trucks

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After bypassing the fuel pump relay, the ECM and IGN have no power. Car will not run. What is the cause?


diagnostic connector gets it power from the cig. lighter fuse change fuse and then you should have power at the connector check the ecm fuse also

Dec 02, 2013 | 1994 Toyota Camry

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Chevy Silverado 2002 2500 shows trouble code, P0230, and P0300


P0230 - Fuel Pump Primary Circuit Malfunction Symptoms - Engine Light ON (or Service Engine Soon Warning Light) Possible causes - Blown Fuel Pump fuse
- Open Fuel Pump Monitor Circuit
- Faulty Fuel Pump Relay
- Damaged ECM. P0230 Description The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. When the ignition switch is first turned ON, the ECM energizes the fuel pump relay, which applies power to the fuel pump. The ECM enables the fuel pump relay as long as the engine is cranking or running, and crankshaft reference pulses are received. If no crankshaft reference pulses are received, the ECM de-energizes the fuel pump relay after 2 seconds. The ECM monitors the voltage on the fuel pump relay control circuit.
Please go to this LINK for P0300 diagnosis.

Feb 16, 2012 | Cars & Trucks

1 Answer

I am not getting a signal to my fuel pump, fuel pump relay nor the 10 amp fuel pump relay fuse. I have checked my wiring from the ECM to the FPR and it is good. Where does the power come from through the...


The fuel pump relay is powered by a fusible link connected to the starter solenoid on the positive battery terminal. That fusible link feeds the 10 amp fuse near the relay. You can test the fusible links with a 12 volt test lamp. If the fusible link test okay check for an open circuit in the wire between the link and the 10 amp fuse. Hope this gets you fixed.

Jul 01, 2011 | 1987 Chevrolet Corvette

1 Answer

2003 sonoma, 4.3. ran fine, one morning tried to start, heard a pop" not in the motor" would turn over but not start, fuel pump made no sound in "on" postion or when starter was bumped....


There is nothing in the circuit after the relay, however, hearing the relay doesn't mean the power is available to run the pump, as the pump circuit is separate from the relay solenoid. The pump needs power from the 20 amp "ECM B" fuse. If you probe the relay socket with a test light, there should be 2 hot terminals--one from the PCM and one from the ECM B fuse. See diagram below.


If the power is there, are you sure it's the fuel pump relay that you hear clicking? If there are other relays in the box, it may be one of them that's coming on. Try swapping the pump relay with another one. Let me know if you get stuck or have more questions.

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Nov 07, 2010 | 2003 GMC Sonoma Extended Cab

2 Answers

1993 rodeo not running no power to fuel pump


if there is no power to the fuel pump check relays and fuses....UNDERHOOD FUSE & RELAY PANEL IDENTIFICATION Fig. 2: Underhood Fuse & Relay Panel Identification Courtesy of ISUZU MOTOR CO. Fusible Link Identification ? A - 80 Amp (1991-92 3.1L) ? A - 60 Amp Main-1 ? B - 30 Amp Main-2 ? C - 30 Amp (1993-94) ECM (3.2L) ? D - 30 Amp Condenser Fan (A/T Models) Relay Identification ? 1 - Headlight Relay ? 2 - A/C - Heater Relay ? 3 - Starter Relay ? 4 - A/C Compressor Relay ? 5 - Charge Relay ? 6 - Fuel Pump Relay ? 7 - ECM Relay ? 8 - Wiper Relay Fuse & Circuit Breaker Identification ? 1 - 15 Amp (1991) ECM, Fuel Injection System ? 1 - 15 Amp (1992-94 2.6L) ECM, Fuel Injection System ? 1 - 10 Amp (1992-94 3.1 & 3.2L) Heated Oxygen Sensor, Fuel Injection System ? 2 - 20 Amp (1991-92) Fuel Pump ? 2 - 20 Amp (1993-94 2.6L) Fuel Pump ? 2 - 15 Amp (1993-94 3.2L) Fuel Pump ? 3 - 10 Amp (1991) ? 3 - 15 Amp (1992-94) Turn Signal Lights, Hazard Warning Flasher Lights ? 4 - 10 Amp Horn, Door Locks ? 5 - Not Used (1991 3.1L) ? 5 - 10 Amp Charging System, Charge Warning Light WARNING: Always disconnect battery ground cable before servicing "high- current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician. Page 1 of 2 FUSES & CIRCUIT BREAKERS -1994 Isuzu Rodeo LS? 6 - Not Used (1991) (1992-93 2.6L) ? 6 - 10 Amp (1992-94 3.1L & 3.2L) A/T Interlock System ? 6 - 10 Amp (1994 2.6L) Heated Oxygen Sensor, Fuel Injection System ? 7 - 20 Amp Heater/Air Conditioning Blower Controls ? 8 - 10 Amp Air Conditioner Compressor Controls ? 9 - 10 Amp Right Headlight ? 10 - 10 Amp Left Headlight © 2008 Mitchell Repair Information Co., LLC.
62217_isuzfuse_1.jpg
Underhood fuse block swap out relay #7 thats the ECM relay.
Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location.
Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

Mar 28, 2010 | 1993 Isuzu Rodeo

1 Answer

2000 S10 4.3L Fuel pump stopped working out of the blue. We Put a new Fuel Pump in, new harnes to fuel pump, new fuel filter, new relay, new fuses in IGN C and ECM B fuses. Still the pump will not turn on....


Did you verify that the relay terminals have the appropriate signals to them? 

ECM fuse B (20-amp) should provide power at all times to the orange wire of the fuel pump relay. The relay coil receives ground via the black wire, and relay coil gets power from the dark green/white wire. When the relay is closed, you should have battery power on the gray wire. 

The relay trigger wire should have power from the dark green/white wire in terminal 1 of the Vehicle Control Module (VCM) connector for the first couple of seconds after they key is turned to run (to prime the system) and when the truck is running. Checking for all the appropriate signals at the relay is where I would start. That is after I checked for diagnostic codes.

Believe the fuel relay is the middle relay out of the three in the left rear of the glove box. Last thing is to hot wire the fuel pump if you can not get it scanned, see if the pump is bad unless your going to have a shop work on changing the fuel pump.
Good luck and hope this helps. keep me posted.

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1 Answer

1991 pontiac 2.5 tech 4 fuel pump relay wont energize


Look for a bad fuse or relay. If both check out, most likely an ECM problem

Mar 07, 2009 | 1991 Pontiac Grand Am

1 Answer

Burns out foul pumps


thanks for getting back well about an hour an i have put 5 of them in an they run great for that hour cleaned tank an sending unit an all liens o an you no its a 7.3 liter deisel

Aug 30, 2008 | 1999 Ford F350 Regular Cab

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