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Old 01-09-2009, 05:25 AM   #1
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Default How fast can a fuel pump die?

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.
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Old 01-09-2009, 07:52 AM   #2
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Check your fuel filter first.
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Old 01-09-2009, 08:48 AM   #3
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Original pump? AFPR? Piping changed how?
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Old 01-09-2009, 09:06 AM   #4
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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.
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Old 01-09-2009, 09:51 AM   #5
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Use the gauge.. 30-35ish at idle, 80ish at the top end (with hose kinked). Anything less, is uncivilized.
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Old 01-09-2009, 05:30 PM   #6
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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.

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Old 01-09-2009, 05:41 PM   #7
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i did a fuel pump in my sisters jeep and it died in 15 minutes. i was pissed to say the least.
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Old 01-09-2009, 06:08 PM   #8
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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.
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Old 01-09-2009, 06:13 PM   #9
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FPR failed. Swapped to another OEM piece and it's back to normal.
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