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Old 05-07-2012, 03:37 PM   #1 (permalink)
adam52jp
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Fuel pressure relief valve shim

When is a good time to do this mod? I run the banks with speed loader in all power levels and am curious as to if and when the pressures are released back to the tank. Do I currently exceed this limit or not? How would I know?
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Old 05-07-2012, 05:07 PM   #2 (permalink)
carter_44
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I highly doubt that your Banks tuning is aggressive enough. No way your pressurizing the rail enough for the FPRV to be opening. My LLY with a max effort tune would pull hard and then fall on its face when the FPRV blew open. Race valve fixed the problem and now just pulls hard.

If your worried that yours is opening just do a quick bottle test. That will tell your for sure.
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Old 05-07-2012, 05:29 PM   #3 (permalink)
adam52jp
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Do you know what the fuel rail pressure values are for the FPRV? I'd like to compare them to what the Banks system will pressurize to. I think I remeber something in the neighborhood on 26,000 PSI? not exactly sure
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Old 05-07-2012, 05:38 PM   #4 (permalink)
adam52jp
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I should also note that I have had the loss of power (limp mode) before but it isnt consistent. The banks 6 gun indicated transmission slip which ive read limp can be caused by the brief loss of power due to the FPRV beginning to open when at the top of the power cycle or WOT. This makes sense and possibly why I have trouble repeating it. Ive also thrown codes (with no way to read) which did not adversly affect any performance but was after 80% acceleration for a constant pull from 20-75mph. I have had the transmission apart recently for visual inspection and its perfectly clean with no burns or any sign of deterioration.
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Old 05-09-2012, 03:20 PM   #5 (permalink)
adam52jp
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Truck limped yesterday with an acceleration from 60 (not on the 5th gear) to 85 after it shifted into 5th.. WOT. Is this a symptom of transmission slip or fprv opening? I really appreciate the knowledge on this. Check engine light illuminated after limp mode occurred. Truck felt like it fell on its face
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Old 05-09-2012, 03:38 PM   #6 (permalink)
bigneily
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Sounds like the tranny slipped bad, Causing the limp mode.
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Old 05-09-2012, 05:37 PM   #7 (permalink)
mtl_dmax
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Don't guess if you're FPRV is leaking pressure or not, bottle test it and know for sure.
Test is easy and a few WOT runs and you'll know if you need to shim or not.
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Old 05-12-2012, 11:10 AM   #8 (permalink)
seab1209
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My Edge on level 2 was enough to open the FPRV. Bottle tested it, then added the shim. Didn't have a problem until the FPR went out. With new FPR, shim and lift pump no fueling issues anymore. Good luck.
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Old 05-13-2012, 10:17 AM   #9 (permalink)
adam52jp
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Seab1209.. What did your truck do when the fprv opened?
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Old 05-13-2012, 12:32 PM   #10 (permalink)
bartman39
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What happens when the FPRV opens is the actual rail pressure is low Vs. the demand rail pressure for to long of a period time... This tells the ECU to de-rate or limit the engine to prevent damage due to an excessive lean condition which is called "limp mode"...

Just a note but if your truck (adam52jp) has other mods like a tuner and it being a 2004.5/2005 then the FPRV has a lot of time on it and that spring inside will get weak hence the reason for the shim mod... But with some tuners even a new new FPRV will not be enough you may even have to shim a new one (been there done that)... With a simple search of the how to for the shim mod its a do it yourself job with nothing more than a digital caliper ($12-20) and a trip to the hardware store for a nut and washers for shims... The hardest part is the removal of the FPRV but I have done it for myself and half a dozen buddies trucks... Just takes the right tools...
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