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Default WMI pump stuck on...FSB BAD? - 04-13-2020, 05:49 PM

So the other day I doing a pull and my dash reset mid pull, after I could hear a noise wich turned out to be my meth pump. Wasn’t hurting off even though there was no demand at idle.

My FSB red and yellow wires have 14v blue wire has 0.6v green and black wire nothing.

Is my FSB Bad?


07' 335xi, VTT Stage 2, Meth CM10, Stage 2 LPFP pri, walbro 525 LPFP 2nd, JB4 E85 BEF, VRSF exhaust, Phoenix Race IC, MMP AL inlets, VTT AL Outlet, PR Coils, Fuel-IT CPI 950cc, Manual swapped, SMF Spec Twin disk
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Default 04-13-2020, 05:51 PM

Settings and pic of FSB
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07' 335xi, VTT Stage 2, Meth CM10, Stage 2 LPFP pri, walbro 525 LPFP 2nd, JB4 E85 BEF, VRSF exhaust, Phoenix Race IC, MMP AL inlets, VTT AL Outlet, PR Coils, Fuel-IT CPI 950cc, Manual swapped, SMF Spec Twin disk
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Default 04-14-2020, 07:19 AM

How old?


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Default 04-14-2020, 08:32 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
How old?
Yeah, guess 3 years now �� can’t remember honestly 2-3 years

The green light on the board still blinks, don’t know if it’s supposed or be solid


07' 335xi, VTT Stage 2, Meth CM10, Stage 2 LPFP pri, walbro 525 LPFP 2nd, JB4 E85 BEF, VRSF exhaust, Phoenix Race IC, MMP AL inlets, VTT AL Outlet, PR Coils, Fuel-IT CPI 950cc, Manual swapped, SMF Spec Twin disk
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Default 04-16-2020, 03:49 PM

Any thoughts on this before I spend $150 to “find out”, the pump should be constantly on, so FSB or JB4


07' 335xi, VTT Stage 2, Meth CM10, Stage 2 LPFP pri, walbro 525 LPFP 2nd, JB4 E85 BEF, VRSF exhaust, Phoenix Race IC, MMP AL inlets, VTT AL Outlet, PR Coils, Fuel-IT CPI 950cc, Manual swapped, SMF Spec Twin disk
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Default 04-18-2020, 11:32 AM

Update:

I cut the wire from the JB4. Pump still gets power, going to buy a new FSB. See what happens.


07' 335xi, VTT Stage 2, Meth CM10, Stage 2 LPFP pri, walbro 525 LPFP 2nd, JB4 E85 BEF, VRSF exhaust, Phoenix Race IC, MMP AL inlets, VTT AL Outlet, PR Coils, Fuel-IT CPI 950cc, Manual swapped, SMF Spec Twin disk
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Default 05-04-2020, 07:52 PM

So I replaced the FSB and it doesn’t run all the time anymore, need to make a few pulls to verify but think it’s fixed


07' 335xi, VTT Stage 2, Meth CM10, Stage 2 LPFP pri, walbro 525 LPFP 2nd, JB4 E85 BEF, VRSF exhaust, Phoenix Race IC, MMP AL inlets, VTT AL Outlet, PR Coils, Fuel-IT CPI 950cc, Manual swapped, SMF Spec Twin disk
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