Question about 2000 Chevrolet S-10

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FUEL PUMP STOP WORKING HOW VOLTS R SUPOSE TO BE

FUEL PUMP STOP WORKING HOW MANY VOLTS R SUPOSE TO BE COMING OUT OF THE WIRES AT THE PUMP ONLY HAVE 5.0 VOLTS

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  • Chevrolet Master
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12 volts, and thgis should be fed by a fuel pump relay.

Posted on Jul 29, 2010

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I only have 5 volts at the fuel pump on my 2003 h2 hummer


You may have damaged the wiring to the fuel pump speed control module or the module is defective, have the local GM dealer test the system performance to confirm this.

Sep 04, 2012 | 2003 Hummer H2

1 Answer

The car has spark fuel is coming but the injectors cannot open permanent feed is there on one of the wires what can be my problem


You may not have enough fuel pressure. The pump can still work and be weak. I am not sure what your pressure is suposed to be but most are 40 to 60 pounds.

Jun 29, 2011 | 2001 Daewoo Lanos

1 Answer

Fuel pump not coming on,installed new one, white plug that has a yellow wire has 5 volts and ground is ok the 2 wires in the center shows 0


The plug you are referring to is probably the fuel tank pressure sender not the fuel pump. It would be plugged into a black sensor about 2 inches long pushed into a rubber grommet on the fuel bung. The fuel pump connector would have more that 2 wires going to it. most likely a heavy purple wire would be the power to the pump. It has to have 12 volts to it to work. The sender may have 3 wires, 5 volts, ground, and sense. the pump connector would have 12 volts, ground and 5 volts for the fuel gauge sender down in the tank.
If the 12 volts is not there, check the fuel pump relay. it is usually up on the drivers side firewall.
With the key in the on position without starting the engine, you should have 12 volts to the pump for 3 seconds then it will click off. Without cranking the engine you should be able to locate the relay by the clicking sound.
There is also the obvious, like checking the fuel pump fuse.

Jan 11, 2011 | 2003 Chevrolet Avalanche

2 Answers

We replaced the fuel pump on our 2001 chey 1500 4.8 and the fuel pump still will not come on and there is power getting to the fuel pump but the fuel pump wont come on


POWER GOING TO FUEL PUMP NOT TO FUEL PUMP.YOU CAN BUY AND REPLACE FUEL PUMP WIRES SEPERATELY.SOUND LIKE OLD WIRES HAS A OPEN CIRCUIT OR POOR GROUND.

Oct 01, 2010 | 2001 Chevrolet Silverado 1500

1 Answer

Don't have 12v(only one wire has 5v) at fuel pump w/ignition in the on position. All four wires in harness have continuity.


If your checking fuel pump voltage, check other wires while cranking that will be fuel pump voltage and will only have voltage while cranking, or 3 to 5 secon after stop cranking. the one 5 volts will be gas gauge.

Nov 16, 2009 | 1997 Jeep Wrangler

1 Answer

Fuel pump- 2002 GMC Sierra


The fuel sending unit only controls the gas guage not the fuel supply to the vehicle. The pump is twelve volts. If you are not getting twelve volts on the PUMP wires check the fuel pump relay and the key circuit to it. If you have to cycle the key three to four times rapidly to get the vehicle to start check the fuel pump pressure at the regulator for manufacturer specs. An injector stuck open will also cause same problems you are describing.

Jul 30, 2009 | 2002 GMC Sierra

3 Answers

Have 93 chevy s10, stopped and started just fine


the other wire that is "dead" is the ground wire for the fuel pump. try cutting that wire after the connector towards the pump, and running it to a good clean ground.

Jun 15, 2009 | 2000 Chevrolet Blazer

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

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