Question about 1999 Pontiac Sunfire

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No power to fuel pump 1999 sunfire

No power to fuel pump fuse es good relay good swtill no power

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Check the wiring at the fuel pump assembly for corrosion, if the wires look ok, i would then move to the Crank and cam shaft sensors. if these sensors are not in good condition , it will cuase these actions.

if everythign checks out ok with the sensors, this will confirm a serious PCM issue.

Posted on Jun 19, 2009

  • Michael Masters
    Michael Masters Jun 19, 2009

    I would also run a diagnostic scan on the vehicle for any stored trouble codes that may be in the PCM/ECM.

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1999 sunfire will start but stalls after a minute or so. turn key back to on position and can hear fuel pump then can start it again but only runs for a minute then stalls again


Assuming the pump relay is good, it could be the engine computer or something else. The computer needs to see oil pressure or RPM to continue to energize the pump relay. You could jumper the relay to verify.

Jan 27, 2014 | 1999 Pontiac Sunfire

1 Answer

I have a 1997 sunfire 2.4. engine changed fuel pump relay an fuse am not getting any voltage to the fuse box or relay fuel pump will not kick on any suggestions?


the issue isnt the relay, your going to have to chase it down with your volt meter or test light, sorry no quick fix and fancy trick on this one. if the fuse box or relay box isnt getting power you need to follow the power lead until you find power again. once you find power the issue will most likely be obvious, like a bad connection or loose ground..hope this helps

Mar 14, 2012 | 1997 Pontiac Sunfire

2 Answers

99 Pontiac Sunfire


Hello mcammdf.
To properly test the fuel gauge circuit you will need to check the purple wire at the connector to the fuel tank.
Run a wire from the purple wire at the connector to body ground. If the gauge moves when you ground it the circuit to that point is good.
These cars are noted for fuel gauge problems and most probably the issue will be the sending unit in the fuel tank.

KL

Jan 02, 2010 | 1999 Pontiac Sunfire

1 Answer

Is there a shut off switch ia 2000 pontiac sunfire if so where? the fuel pump is new plus i changed the spark plugs and wires the relay for fuel pump and changed coil cap. the fuel pump will come on if you...


check the pcm ignition fuse and the fuel pump injectors fuse.if all is good.your pcm could be the problem. the pcm it controls fuel pump.first have car hooked up to scanner to look for pcm failure code.

Nov 25, 2009 | 2000 Pontiac Sunfire

1 Answer

Keep blowing 20 amp fuse to fuel pump when turning on sunfire


Fuel pump relay is bad or fuel pump is bad (sometimes the pump seizes) and creates a load thats blowing the fuse.If both are good then there's a short in the fuel pump circuit.

Sep 13, 2009 | 1998 Pontiac Sunfire

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