I recently had the factory fuel pump fail in my 2019 Bullitt (with just 6900 miles on the odometer) which had been on E85 with a JMS BAP for three years. The failure happened without any advance warning and at one of the busiest intersections in town, resulting in me having to get the car towed home. I don’t think the failure was caused by the BAP because the JMS unit doesn’t increase voltage full time (only when at 50% throttle or more).
Once I got the car home, I piddled around with it and finally got it started. I checked the fuel pressure via my nitrous controller screen the pressure was very low at 24 psi. I replaced the pump with a DW400 and cleaned the injectors with an injector cleaner kit and the pressure is now at 82+. I also cut the factory pump open to inspect it and found that the brushes had burnt up inside. In addition, the motor showed some signs of cracking and discoloration and the sock filter was filthy.
Has anyone experienced a similar problem with their factory pump?
Once I got the car home, I piddled around with it and finally got it started. I checked the fuel pressure via my nitrous controller screen the pressure was very low at 24 psi. I replaced the pump with a DW400 and cleaned the injectors with an injector cleaner kit and the pressure is now at 82+. I also cut the factory pump open to inspect it and found that the brushes had burnt up inside. In addition, the motor showed some signs of cracking and discoloration and the sock filter was filthy.
Has anyone experienced a similar problem with their factory pump?
Last edited: