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I have a 99 pontiac grand am, it runs fine and every-time we use the ac or heater the fuel pump makes a louder humming noise than usual and it runs a little more sluggish and kinda hesitates to take off if we stop at a light or stop sign. i did replace my fuel filter, it... Read More

• What I'd do is start with checking the belts , air filter , change the gas filter bec t could be slightly clogged and when the A/C is on it causes the fuel pump to work harder due to he dirt etc in the filter.I'am not saying it's the fuel filter for sure but if you've not changed it every year it's a good place to... Read More
• I would make that a weekend planned project .. Put a new fuel pump on the car before it just quits in the middle of traffic..better to plan the repair than to have to react to it ...The motor pulling down with the ac is normal . Smaller the motor the more it pulls down .. Ac uses the same amount of horsepower no... Read More
• When you turn on the AC, the motor will always be a little more sluggish. When the fuel pump konks out the car will stall frequently and then it wont start. If your sure the pump is making the noise then it probably is getting ready to go. Reference:25 years of backyard mechanics
• No. maybe your air filter needs to be replaced.

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