Savington

iTrader: (31)

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.

Rafa

iTrader: (22)

Check your fuel filter first.

olderguy

iTrader: (19)

Original pump? AFPR? Piping changed how?

patsmx5

iTrader: (16)

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.

Newbsauce

iTrader: (2)

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

Savington

iTrader: (31)

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.

bryantaylor

iTrader: (5)

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

ChairFaceChippendale

iTrader: (1)

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.

Savington

iTrader: (31)

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