Fuel Pump
cvoss2000
06-20-2004, 11:28 AM
I parked my 01 Denali in the parking lot and took my family in to eat. When we came out, the car would start only briefly, then die. I had it towed to the dealer and told him to update the pcm before he did any diagnostics. He reprogrammed it with no success. Then he diagnosed it, checked for bad gas, and determined the fuel pump/sender unit to be bad. He replaced the unit for $980 which included parts, labor, diagnostics. several pcm updates, and carbon cleaning. Not too bad considering they got the work done in 3 hours, but there went my savings account.
I asked him why the fuel pump went bad so soon. He said that it been his expierience that often times the way the stock remote start/anti-theft system is wired can cause the fuel pump to burn up. He advised me not to use the remote start anymore just to be safe, but he said that he couldn't give me a solid reason why it went out and that the remote start thing is just his opinion.
Anyone else have similar issues? Also, my truck only idles at around 550 RPM's and has trouble even maintaining that when it first starts up with the AC on. The pcm program update didn't fix it. Any opinions?
One more thing, condensation in the headlight?
Thanks.
I asked him why the fuel pump went bad so soon. He said that it been his expierience that often times the way the stock remote start/anti-theft system is wired can cause the fuel pump to burn up. He advised me not to use the remote start anymore just to be safe, but he said that he couldn't give me a solid reason why it went out and that the remote start thing is just his opinion.
Anyone else have similar issues? Also, my truck only idles at around 550 RPM's and has trouble even maintaining that when it first starts up with the AC on. The pcm program update didn't fix it. Any opinions?
One more thing, condensation in the headlight?
Thanks.
GMCTech
06-21-2004, 05:04 AM
First of all, the remote start really has nothing to do with the operation of the fuel pump. The remote start performs the same function as putting the key in the ignition.
We have replaced so many fuel pumps it would make your head spin. :rofl: The most common cause is the fuel pump motor is overworked due to a dirty fuel filter. (The filter should be replaced every year.)
Secondly, try to keep at least half a tank of fuel as much as possible. That pump is cooled by the fuel around it, and heat is the enemy of electrical components - especially electric motors. :angryfire
That trucks idle should be 550. As far as the idle fluctuation, that is normal with something drawing as much power as the A/C. _ It takes a moment for the idle air control to adjust as loads are added and removed from the engine.
Hope this has helped.
We have replaced so many fuel pumps it would make your head spin. :rofl: The most common cause is the fuel pump motor is overworked due to a dirty fuel filter. (The filter should be replaced every year.)
Secondly, try to keep at least half a tank of fuel as much as possible. That pump is cooled by the fuel around it, and heat is the enemy of electrical components - especially electric motors. :angryfire
That trucks idle should be 550. As far as the idle fluctuation, that is normal with something drawing as much power as the A/C. _ It takes a moment for the idle air control to adjust as loads are added and removed from the engine.
Hope this has helped.
davidhi
01-31-2005, 05:09 PM
First of all, the remote start really has nothing to do with the operation of the fuel pump. The remote start performs the same function as putting the key in the ignition.
We have replaced so many fuel pumps it would make your head spin. :rofl: The most common cause is the fuel pump motor is overworked due to a dirty fuel filter. (The filter should be replaced every year.)
Secondly, try to keep at least half a tank of fuel as much as possible. That pump is cooled by the fuel around it, and heat is the enemy of electrical components - especially electric motors. :angryfire
That trucks idle should be 550. As far as the idle fluctuation, that is normal with something drawing as much power as the A/C. _ It takes a moment for the idle air control to adjust as loads are added and removed from the engine.
Hope this has helped.
...Just went through this - my head's still spinning!!! lmao
We have replaced so many fuel pumps it would make your head spin. :rofl: The most common cause is the fuel pump motor is overworked due to a dirty fuel filter. (The filter should be replaced every year.)
Secondly, try to keep at least half a tank of fuel as much as possible. That pump is cooled by the fuel around it, and heat is the enemy of electrical components - especially electric motors. :angryfire
That trucks idle should be 550. As far as the idle fluctuation, that is normal with something drawing as much power as the A/C. _ It takes a moment for the idle air control to adjust as loads are added and removed from the engine.
Hope this has helped.
...Just went through this - my head's still spinning!!! lmao
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