Can a low fuel pump cause a misfire?
Can a low fuel pump cause a misfire? Fuel Pump Tests. Check the fuel pressure with a fuel pressure gauge. A fuel pump putting out a low fuel pressure (even if it keeps the engine running) will cause a lean condition that will cause misfires and/or a rough idle condition. Fuel Pressure Regulator Tests. What causes a misfire on a GM 4.8l engine? Check the fuel pressure with a fuel pressure gauge. A fuel pump putting out a low fuel pressure (even if it keeps the engine running) will cause a lean condition that will cause misfires and/or a rough...