I think I just lost my fuel pump. The only other variable I changed tonight was the switch to a DIY dual feed fuel rail. Anyone have other ideas? Did I lock an injector closed?

I had to add a little fuel to the 212kpa cells on the first pull I made, and the 128 and 156 cells seemed very lean, so I had dropped back to wastegate boost and was tuning those when I lost fuel on a pull. I smacked the throttle and the wideband snapped to 16:1+. The pull before it was a litttle lean, high 12s low 13s but I hadn't tuned those cells since installing the test pipe so I don't know what caused it.

 

Check your fuel filter first.

 

Original pump? AFPR? Piping changed how?

 

Fuel pumps slowly get weaker over their lifetime. Then they go out with a bang. Sounds like the bang to me. Fuel pressure gauge will tell you what's happening.

 

Use the gauge.. 30-35ish at idle, 80ish at the top end (with hose kinked). Anything less, is uncivilized.

 

35psi at idle - and not a single bit more, ever. 5000rpm in 1st gear, wideband at like 18:1, 35psi of fuel pressure. Swapping pumps now.

Edit: Scratch that, just pinched the return and jumpered the fuel pump. Rose to 75psi right away. I am swapping the FPR now.

 

i did a fuel pump in my sisters jeep and it died in 15 minutes. i was pissed to say the least.

 

usually when they get old and die they tend to make some noise first. but just like anything else there is nothing that says you won't get a crap unit every once and a while.

 

FPR failed. Swapped to another OEM piece and it's back to normal.