Question about 1999 GMC Suburban

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1999 GMC Suburban replaced fuel pump but new pump will not run no voltage to pump but fuses are good and relay is good Have 12 volts at fuse and relay

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Ok check if there is voltage on the terminal that connects to the tank inlet usually always have problems with the negative lead so I recommend you check it .... Thanks good luck

Posted on Feb 06, 2010

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30amp auto shutdown fuse blows is it alternater


The ASD relay supplies battery voltage (12+ volts) to the fuel injectors and ignition coil(s). With certain emissions packages it also supplies 12-volts to the oxygen sensor heating elements. The Fuel Pump Relay is a separate relay controlled by the ASD relay input to the PCM. Fuse #12 (10amp) provides 12 volts to the coil side of both the relays and the ignition switch. Fuse #6 (30 amps) supplies 12 volts to the output side of the relay. Fuse #16 (15 amp) from the relay output to the Oxygen Sensors and Fuse #26 (15 amp) relay output to the PCM. Fuse #24 (20 amp) is Fuel pump relay output to fuel pump. Fuse #19 (10 amp) supplies 12 volts direct to the PCM.
look for burned or melted wires in the offending circuit.
sounds like you wiggled a wire while installing new relay.

Mar 06, 2013 | Cars & Trucks

1 Answer

No voltage to electric fuel pump relay?


voltage comes from fuse box, should have a fuel pump fuse, check for blown fuse, if not try jumping a fused wire from 12 volts to relay and see if fuel pump runs, hope this helps ?

Sep 03, 2012 | 2002 Kia Sportage

1 Answer

Dodge 1500 1995 pickup 7.5 volts to fuel pumpwill not start applied 12 volts pump runs book sayes pcm de-energize booth relayes and will not send proper voltage to fuel pump


There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse.
You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse.
That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.

Jun 24, 2012 | Cars & Trucks

1 Answer

I have no currant to the relay for the fuel pump on a 1999 gmc suburban Are there any fuses to be checked, and if so where are they located?


There is a relay in the engine compartment And there also should be a fuse in the relay box for the pump it will be marked on the lid when you remove it. There is another fuse in the inside of the suburban for the computer and for gages make sure they are OK, pull the fuse out and when looking at the fuse make sure it is connected the s should touch each spade terminal. if all the fuses are good then turn the key to the run position and listen for the fuel pump in the tank it should run for two seconds, if you don't hear the fuel pump run and the fuses are OK then your oil pressure switch is defective and depending on which engine you have will determine where the location will be for the oil pressure switch. The oil pressure switch will shut off the power to the fuel pump if it does not show oil pressure and depending if you have a oil gage or not you will not know for sure. you will not have power to the relay unless the vehicle is cranking over. also I can't remember if it has a roll over switch on that model, check the glove box or on the side where you fill up the fuel tank your it should be on that side I hope this helps And thanks for using fix-ya.

Apr 23, 2010 | 1999 GMC Suburban

1 Answer

1999 Meercury Sable. No electric to fuel pump


There are 2 fuses and a relay involved in this circuit but the lines that run power to the pump run partially exposed under the vehicle as well. Check the Interior Fuse, check the Fuse in the box under the hood and check to make sure you have voltage at the fuse under the hood. If these are good check for voltage on the wires going to the fuel pump at the fuel pump itself. You can do this with a multimeter and thumb tack. Use the thumb tack to puncture the insulation in the wires and test for voltage. If you don't have voltage there, start working your way back 12" at a time until you find the point where you have voltage to isolate the area of the break.

Nov 28, 2009 | 1999 Mercury Sable

3 Answers

99 gmc suburban will not start unless pour gas into the throttle body"


IF YOU HAVE CHECKED THE FUEL PUMP FUSE AND RELAY AND THEY ARE BOTH GOOD THEN THERE IS A GOOD POSSIBILITY THAT THE FUEL PUMP HAS GONE BAD. YOU MAY BE ABLE TO GET IT TO PUMP ONE MORE TIME IF YOU BANG ON THE BOTTOM OF THE FUEL TANK WHILE SOMEONE ELSE TRIES TO CRANK THE ENGINE. IT MAY TAKE A FEW TRIES TO GET IT TO START, BUT THIS HAS WORKED NUMEROUS TIMES FOR ME. IF THE PUMP DOES TURN IT MAY NEVER RUN AFTER THIS, SO FIGURE OUT WHERE YOU WANT TO TAKE IT TO GET IT REPAIRED. THE TANK MUST BE DROPPED TO REMOVE THE PUMP. HOPE THIS HELPS. GOOD LUCK. THANK YOU IN ADVANCE FOR AN HONEST RATING AND FOR USING FIX-YA

May 10, 2009 | 1999 GMC Suburban

1 Answer

1999 GMC Suburban 350 wont run


Per your description, it sounds like you are missing an injector pulse from the ECM.
Check the under-hood fuse box and verify the "ECM1" fuse is good (12 volt supply to injectors).
With the key in the run position, verify you have 12 volts at an injector.
Barrow or purchase a "noid" light to verify you have an injector ground pulse from the ECM.
Let me know what you find and we can proceed from there.
Regards,

May 07, 2009 | 1999 Chevrolet Suburban

1 Answer

On my 1994 plymouth voyager the 3 wire harness to fuel pump (blue wire) doesn't have 12 volts; should it? fuel pump quit then worked once when hot-wired with 12 volts. fuse and relay is good.


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.

Apr 26, 2009 | 1999 Plymouth Grand Voyager

3 Answers

I HAVE A 1991 GMC SIERRA PICKUP THAT WON'T START. WE'VE ALREADY CHECKED THE IGNITION MODUAL AND HAVE REPLACED THE COIL,DRIED OUT THE DISTRIBUTOR CAP. IT HAS SPARK IT JUST KEEPS TURNING OVER WITHOUT FIREING...


If you are getting spark then it may be a fuel pump problem or fuel pump relay or inline fuse. Always start Fuel system troubleshooting by replacing the fuel filter or filters! You may be able to apply 12 volts from the battery (use a fused line) directly to the 12 volt side of the fuel pump and listen to see if the pump runs. Also may need to check that it is getting a good ground to the fuel pump. Then if the fuel pump does not run independently, replace the fuel pump. The fuel pump relay is computer controlled and several other things give the computer inputs which then controls the voltage to the fuel pump relay.

Jan 08, 2009 | 1997 GMC Sierra

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