The fuel/combustion system of your vehicle depends on the Pontiac fuel pump to maintain the proper volume and pressure levels to keep the combustion cycle going. Your fuel pump is only activated for the few seconds following the turn of your key in the ignition. At that point, the fuel pump relay closes, activating the fuel pump to build up the pressure levels. When the engine begins to crank, the relay stops. Unfortunately, the symptoms of a failing fuel pump are the same symptoms that are seen when other components in the combustion system fail - so it might take some detective work to pinpoint the cause. When the Pontiac fuel pump begins to fail, you will notice hesitation, bucking and general power weakness when you are driving at high speeds. In the mornings, the engine will crank but will not start when you turn the ignition key. And when it finally starts, the engine gives out. Or, your Pontiac might display 'lean misfires,' which is an indication that the proper air-to-fuel ratios are not being reached for proper combustion. Unburned fuel is passed into the exhaust system during a lean misfire. That issue can raise your hydrocarbon emissions and reduce your gas mileage. Your Pontiac fuel pump might be working extra hard because of a clog in the fuel system, which is often the result of failure to change a fuel filter regularly. When you decide that your Pontiac fuel pump needs replacing, order a new set from our site and start on the work yourself.