Question about 2003 Chevrolet Cavalier

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No power to fuel pump

Fuse and relay are good. The sending unit is working.If I connect 12 volts directly to pump it will work. Which wires at the pump or at the connector wall on the car suppose to be hot when the switch is on.

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Check fuel pump relay, or the asd relay. Could be a security system problem also.

Posted on Jul 02, 2009

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I'm not getting fuel out of the pump but have 8.6 volts on three of the wires at the pump 87 pathfinder


Assuming it is an in-tank fuel pump, the fact there are three wires would suggest it is a combined pump and fuel gauge sender. 8.6 volts between the fuel gauge wire and ground is a realistic figure but is insufficient to operate the fuel pump.
The fuel pump needs a good ground and a feed of 12 volts but for safety reasons power is only supplied to the pump during cranking and when the engine is running. The pump of some cars does run for about 2 seconds when the ignition is switched on.
Unless the fuel pump relay is removed and the terminals are bridged so a constant supply of power is provided at the pump it is very difficult to check the voltage.

It is relatively easy to test the pump by connecting it directly to a known good battery, taking all appropriate safety precautions.

If the pump tests ok the fault is possibly the relay, wiring or connections or perhaps the fuse.
It would be a good plan to check the fuse first.

Oct 04, 2015 | Cars & Trucks

1 Answer

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

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

2 Answers

Fuel gage not working. Only a smsll light seen. Does the fuel pump need changing?


As long as the car is running fine it's safe to say the fuel pump does not need to be replaced. However the fuel tank sending unit may need to be replaced assuming the fuel gauge itself isn't at fault. First check your owners manual if available for your fuse block info and check fuses then I'd look into the sending unit. Let me know if you need help with that

Nov 29, 2010 | 1995 Volvo 940

3 Answers

It seems i am not getting any power to fuel pump, replaced pump still no power dont hear pump turn on at key on position check relays but not sure on good or not


Replace the oil pressure switch for the third wire on that sends 12 volts to the fuel pump upon turning the ignition key on to prime. Once oil pressure is achived the computer shuts that circuit off and turns on the fuel pump relay to power the pump till you shut off the engine

Jul 13, 2010 | 1997 Chevrolet S-10 Pickup

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No power to fuel pump car was running fine just quit repalced fuel pump no power to pump, car will start when spraying starting fluid in to intake, is there a fuse ? also replaced ECM, fuel filter,...


Check for 12 volts power at the fuel pump harness. If no power is going to the pump, check the fuel pump relay. Also, check the fuel pump inertia switch. Ford usually has it on either inside left or right rear trunk fenders.

Apr 09, 2010 | 1987 Ford Taurus

6 Answers

No power to fuel pump


when u checked this u do realize the fuel pump only has 12 volts for 1 second then the computer turns it off unless the engine is started? let me know.

Dec 03, 2009 | 1997 Dodge Ram 1500 Club Cab

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

2 Answers

92 chevy pick up replaced fuel pump but new fuel pump is not runing do they relays or hidden fuses or what do i do next


Check this.. Worst case scenario, Its the whole pump unit ( sending unit and all ) or the simplest, Check the ground wire on top of the chasis,on drivers side near the filler tube. Its a 13 mm bolt thru an eye terminal.. No Hidden fuse. But there is a relay.. and I think the A/c Relay with interchange if ya swap it out

Mar 17, 2009 | 1997 Chevrolet Tahoe

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