05/18/2026
Trying to get caught back up on our posting schedule, and we had a fun one in the shop recently! 🔥
A customer contacted us a while back about fuel pump issues on his Hellcat. He was on the way to the drag strip when the car suddenly shut off before he even made it there. After getting towed to another shop, they found the fuel pump fuses had literally melted into the plastic. 😳
The previous shop suspected a grounding issue with the board and made a few changes, but the customer wanted a second opinion — so we dug into it.
And we’re glad we did.
At idle, the board was reaching nearly 160°F at the fuses with zero driving involved. 🥵 From there, we started a full diagnostic process and checked the entire fuel system front to back.
We:
• Bore scoped the fuel lines looking for restrictions
• Checked filters, rails, pumps, and pump socks
• Added a second fuel pressure gauge at the rail
• Verified wire sizing, grounds, voltage drops, and amp draw
We ended up finding several issues, but the main problem was the controller board itself.
The pumps were idling at 42 PSI while drawing almost 20 amps. At 13.5 volts and 42 PSI, these pumps should’ve been closer to 18 amps — definitely not ideal.
After additional testing, we swapped the board out for an MSD solid-state relay setup and immediately saw major improvements.
Results after the repair:
✅ Nearly 100°F drop in relay temperature
✅ Pump amperage stabilized
✅ 58 PSI fuel pressure at 13.5V with proper operation
✅ Wire temperatures dropped over 20°F
✅ Repaired poorly installed hose fittings with quality Phenix fittings
The customer has since gotten the car back and is back out driving it with no issues.
Huge thanks to James for trusting JE Customs with his badass Hellcat! If you haven’t seen this thing at the track yet, definitely keep an eye out for it. 👊🔥