Question about 1996 Pontiac Sunfire

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I have no power to the fuse in the fuse box that regulates the fuel injectors(all others have power,has been replaced with a good one) which cause the relay to have no power and the pump wont start. after we cross wired the fuse we got one side of the relay to go hot (input) but no output and still no pump action. Can you bypass any of this .If not how can you check the ignition or is it woth it seems all of the other fuses have power when the key is turned on

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  • ahpdriver Feb 05, 2010

    Have replaced the relay,still only power to the front right as you stand against the fender well and I have no power to the fuse in the fuse box unless i jump it then I have power to the fuse and the one side of the relay I f i dont jump I have no power at all to the the fuse or relay

  • ahpdriver Feb 05, 2010

    very helpful, just needed more information

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  • Pontiac Master
  • 19,396 Answers

Hi.


Replace the fuel pump relay.Check if there is power at the grey wire from fuel pump relay when you turn on ignition. That goes to the injectors passing through the fuse.

If there is no power in there, replace the relay.

Bypassing the relay can cause damage to more parts.


Regards.

Posted on Feb 05, 2010

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I have a 1987 chevy pick up truck.There is no fuel coming out of the injectors. Cant figure out why


First, make absolutely sure the fuel pump is running when the key is on and is pushing fuel to the TBI. Take the feed line off the TBI if you have to. Watch it, fuel will spray everywhere if you aren't careful. Most fuel pump "no run" problems are caused by a bad ground. Use a VOM to check for power and ground.

Make sure the injectors receive power when the engine is cranking to start. Might be something as simple as a blown fuse. Can check with a noid light or 12v test light. Remote possibility of the injectors losing power when via the ignition switch and/or wiring when you crank the engine.

Fuel pressure regulator may be defective. TBI must be disassembled to replace it. There is a nice aftermarket adjustable regulator available.

Internal to the TBI itself (SOME, BUT NOT ALL HAD THIS) is a small neoprene pressure bleed. It has a VERY small hole in it, used to slowly bleed off the fuel pump pressure when the engine is shut down. If the diaphragm ruptured the fuel will return to the tank, never building enough pressure to spray out the injectors.

These units are relatively easy to rebuild. Youtube has several good vids walking you thru the process if you have any doubts.

Jul 15, 2014 | 1987 Chevrolet R10

1 Answer

I am getting 02 sensor codes on 2000 gmc blazer with a 3.8 engine. the engine will not start. regulator, relays, and fuses are good. fuel pressure is great. injectors are not injecting, what else can it...


Did you do a noid light test to see if the injectors are getting a signal from the PCM? If you're not getting a signal, you need to check the cam and crank sensors. They talk to the PCM to control the fuel injectors. There is on some models, an injector fuse in the main fuse box under the hood or in the left kick panel in the interior fuse block.

Apr 21, 2013 | 2000 Chevrolet Blazer

1 Answer

Fuel injectors 2 and 4 have no injector pulse


For fuel related problem,the help links are provided below.
Click the link below to go through its procedure:----

How to relieve fuel pressure?
http://technoanswers.blogspot.com/2012/01/how-to-relieve-fuel-pressure.html
--------
Refueling problem?
http://repairhelpcenter.blogspot.com/2012/01/refueling-problem.html
--------
Car consuming more fuel?
http://repairhelpcenter.blogspot.com/2012/01/toyota-tercel-consuming-more-fuel.html
----------
How to maximize fuel economy on your vehicle?
http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html
-------
Fuel pump relay troubleshooting ?
http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html
------------
How to Increase gas mileage vehicle?
http://schematicsdiagram.blogspot.com/2011/12/how-to-increase-gas-mileage-on-2011.html
---------
How to Test and Replace Fuel Injectors?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-and-replace-fuel-injectors.html
-------------------
How to replace Fuel Tank Assembly?
http://vwrepairhelp.blogspot.com/2011/11/how-to-replace-fuel-tank-assembly.html
--------------
FUEL LINES AND FITTINGS ?
http://repairhelpcenter.blogspot.com/2011/11/fuel-lines-and-fittings-on-acura-car.html
------------
Replacing Fuel Charging Assembly on Car?
http://vwrepairhelp.blogspot.com/2011/11/replacing-fuel-charging-assembly-on-car.html
------------
How to replace Fuel Pressure Regulator ?
http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-fuel-pressure-regulator.html
---------------
How to test Fuel Pressure and replace Fuel Pump?
http://repairhelpcenter.blogspot.com/2011/11/how-to-test-fuel-pressure-and-replace.html
--------------
Car will not take fuel into the fuel tank?
http://repairhelpcenter.blogspot.com/2012/01/car-will-not-take-fuel-into-fuel-tank.html
--------------
PGM-FI Main Relay location?
http://repairhelpcenter.blogspot.com/2011/11/pgm-fi-main-relay-on-acura-car-models.html
------------------
How to Relieve Fuel System Pressure on Car Models?
http://repairhelpcenter.blogspot.com/2011/11/how-to-relieve-fuel-system-pressure-on.html
-----------------
How to Replace a Fuel Injector
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-injector.html
----------------
How to Replace a Fuel Pressure Regulator?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pressure-regulator.html
-------------
How to Replace a Fuel Pump?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-fuel-pump.html
-------------------
HOW TO CLEAN A FUEL SYSTEM
http://schematicsdiagram.blogspot.com/2011/07/how-to-clean-fuel-system.html
-----------
HOW TO REPLACE A FUEL TANK
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-tank.html
--------------
HOW TO REPLACE A FUEL TANK CAP
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-tank-cap.html
------------
HOW TO REPLACE A FUEL PUMP ASSEMBLY
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-fuel-pump-assembly.html
-----------
How to change fuel injector on gmc ?
http://schematicsdiagram.blogspot.in/2012/03/how-to-change-fuel-injector-on-2005-gmc.html
------------
Time to replace Fuel pump?
http://schematicsdiagram.blogspot.com/2011/12/time-to-replace-fuel-pump-on-1998-ford.html
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Emergency fuel shut switch location?
http://schematicsdiagram.blogspot.com/2011/12/emergency-fuel-shut-switch-on-ford-car.html
---------------
How to jump fuel pump?
http://schematicsdiagram.blogspot.com/2011/12/how-to-jump-fuel-pump-on-chevrolet.html
------------
Car wont start when cold?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
--------
Car wont start after sitting overnight?
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-after-sitting-overnight.html
---------
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http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html
------------
Fuel leaks from fuel pulsation dampener?
http://repairhelpcenter.blogspot.com/2012/01/fuel-leaks-from-fuel-pulsation-dampener.html
----------
Car will not allow to put fuel?
http://repairhelpcenter.blogspot.com/2012/01/car-will-not-allow-to-put-fuel.html
-----------
Adding performance chip to increase Fuel mileage MPG?
http://technoanswers.blogspot.com/2012/01/adding-performance-chip-to-increase.html
--------------
How to test Electric fuel pump?
http://technoanswers.blogspot.com/2012/01/how-to-test-electric-fuel-pump-on-gmc.html
---------
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-----------
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http://technoanswers.blogspot.in/2012/01/fuel-pump-not-working-on-1991-ford.html
--------------
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http://technoanswers.blogspot.in/2012/01/fuel-pump-has-no-power-on-2002-ford-350.html
------------
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http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

---------
Ford Fuel pump Relay and fuse location diagram?
http://technoanswers.blogspot.in/2012/02/ford-fuel-pump-relay-and-fuse-location.html

--------
Ford inside fuse box diagram showing fuel pump relay?
http://technoanswers.blogspot.in/2012/02/ford-inside-fuse-box-diagram-showing.html
---------------
Ford fuel pump fuse layout diagram?
http://technoanswers.blogspot.in/2012/02/ford-fuel-pump-fuse-layout-diagram.html
--------------
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http://schematicsdiagram.blogspot.in/2012/02/how-to-lower-fuel-pressure-on-toyota.html

------------
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--------------
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----------

This will help.
Thanks.

Feb 04, 2012 | 1998 Mitsubishi Eclipse

1 Answer

Where is the fuel pump reset button the van will turn but acting like no fuel


There is not an fuel pump reset button. There is however an Automatic Shutdown Relay that acts as a fuel pump shutdown. On the 1998 Model: It should be located in the Junction Box located under the leftside of the dashboard There should be a cover over the top of the Junction Box. On the backside of that cover is the identification and location of the Relays and Fuses. If there is no cover, your Owner's Manual should have a schematic identifying the location, position, and type of Relay and Fuses. There should be additional Fuses involving the Fuel Pump. Make sure you not only check the Relay and Fuses to see if they are good, also check with a Voltmeter to check for voltage, with the Key in the "ON" (not start) Position; it should read approximately 12v,

With approx 12v present at the Relay and Fuses, one quick way to determine if there is Voltage to the Fuel Pump:
1) With a Partner behind the wheel. Take the Gas Cap off and place your ear up close to the opening of the Gas Filler Tube. Have your Partner turn the Key to the "ON" (not Start) Position. You should be listening for a humming sound (for 2-3 seconds)meaning the Fuel Pump is getting power (volts).
2) If there is no "humming" or you are not sure, get underneath the Van next to the Gas Tank and have your Partner do it again. Listen for a humming.
3) If there is definitely no humming present with good fuses, relays and voltage, then most likely the Fuel Pump is bad.
4) However, a lot of Fuel Pumps have been replaced only to find out the Pump was good, but the electrical wiring harness was bad and the real culprit.
5) You will have to slightly lower the Fuel Tank to gain access to this electrical connection.
6) After you disconnect the electrical connection, using the Voltmeter check for approximately 12v coming from the Wiring Harness/Connector.
7) Inspect the Wiring Harness/Cnnections for any signs of burns, melting, or shorting. Repair this wiring harness before deciding to replace the fuel pump needlessly.
8) After repairing the Wiring Harness/Connection: Replug it back in and recheck the Fuel Pump one last time.
9) If still no "humming" the Fuel Pump needs to be replaced.

If there is humming from the Fuel Pump, then there are four possible problems.
a) Fuel Filter (when was the last time it was replaced?) It could be clogged, prohobiting fuel flow.
b) Fuel Regulator. Located on the Fuel Rail where the Fuel Injectors are. If there is a presence of Gas in the Vacuum line (the only rubber line on the Fuel Regulator) attached to the Regulator, then the Diaphram of the Fuel Regulator is broke and Gas is not reaching the Fuel Injectors. Instead it is being dumped into the Intake. Replace the Regulator.
c) Fuel Injector Circuitry problem. Using an Auto Stethoscope: Place the Stethoscope end in each individual Fuel Injector. Have your Partner attempt to start the Van. If there is no evident and rythmic "clicking" (fuel injector's gate opening and closing) then the Fuel Injector is faulty or the electrical connection is faulty. To check to find out which is faulty, switch Fuel Injectors (one clicking with one not clicking) and recheck for the clicking.
d) Clogged Fuel Injectors. With the Fuel Rail (with the Fuel Injectors) removed out of the engine. Place clear Plastic tubing over the nozzle ends of all exposed Injectors. With a Partner Starting the Engine, look for
(1) Fuel Flow (presence).
(2) Fuel Spray (pressure).

Let me know if this helped, or if you have any additional information or questions. Feel free to contact me at FixYa.com!

Feb 13, 2010 | 1998 Plymouth Grand Voyager

1 Answer

1987 chevy s10 fuel injector problem. Install new fuel injector but fuel comes out steady causing engine to idle high and bog down when i step on the gas pedal. i have previously replace swapped ecm and...


Check the fuel pressure at the shredder valve, you should have 13 to 13.5psi, anything other then that will give you problems in the GM TBI. If the pressure is bad, then you may have to replace the fuel pressure regulator at the bottom of the TB. 
Good luck and keep me posted. 

Jul 22, 2009 | 1987 Chevrolet S-10 Pickup

2 Answers

The fuel pump is not pumping the fuel.


Is the fuel pump actually coming on??? If it isn't, I would start by checking for a fuel pump relay.  This is usually located up in the engine compartment in a black box on the drivers side.  Relays are small black boxes approx 1"x1".  These have a tendency to go out just like fuses.  Also double check your fuses.  If you suspect a that a relay is bad, you can interchange them with other relays that look the exact same to see if they really are the problems.  These relays are very quick and easy to change and are very cheap.  They usually run no more than $10-15.
Any further questions, feel free to ask.

Feb 03, 2009 | 1995 Chevrolet Lumina Apv

4 Answers

2002 chevy Blazer hard starting did change fuel pressure regulator and fuel filter when we spray starting fluid in throttle body it will start.


replace the fuel injectors, that is the likely cause......

to test the injector, take the power clip off the top of the injector, take one wire and ground it to the body of the car, and another form the battery, to the other post on the injector, if you do not hear a pulsing sound coming from the injector it is bad, if you do, then you have a wiring problem.

Nov 26, 2008 | 2002 Chevrolet Blazer

1 Answer

Wont start


Where the car runs on starter cleaner, this is definitely a fuel problem...

Could be a few things:

Do you hear the fuel pump running outside the car (for a few seconds) when you turn the key on (engine off)?

If not it might be the pump or the pump relay (in the engine compartment fuse and relay box)

If so, it might be:
Clogged inline fuel filter (in the fuel line from the pump to the engine)
Bad fuel pressure regulator
Bad injectors/wiring

Did you check the fuse and wires to see if you have power (and a good ground) to your engine computer (controls fuel injectors), this could also be the culprit (without power to the computer there is no way for the engine to get fuel).

Aug 27, 2008 | 2001 Oldsmobile Alero

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