Silverado GM Truck FSCM Delete Fuel Control Module Bypass GMT900

It’s been done many times. Especially in boosted applications. It WILL work but you need to add in a vacuum referenced mechanical fuel regulator and flash the PCM with EFILive or HPTUNER. First setting is FPCM to “Not Fitted”. As of right now you have no mechanism controlling fuel pressure at all seeing as how the FPCM handles this. You’ll then need to set desired/default pressure at around 400kpa. Last you’d need to change injector offset VS Pressure Delta VS IGNV and injector flow rates to static fuel cell.

I done the same thing almost 3 years ago and have driven it almost everyday since. I have taken it on a few 4 hour drives and had 0 issues. The only problem is if you totally floor it, it will cut out for a second but I dont run mine hard anyways. I have accumulated around 75k so far and still going just fine.

Thank you, very good explanation

I bypassed the module to eliminate several parameters as the issue. It will set a check engine light for high voltage because the voltage is adjusted by the ECU.

Did u use the green/white to or just the grey to pump

What are the relay PIN numbers for each color wire?

Bypassed mine 3 years ago still going strong

I did about the same thing on my truck. Haven't had any issues

Does this method keep the check engine light on? Thanks in advance.

My problem is that injectors are dumping fuel. "Truck will run but it's flooding and smoking like a diesel. Could the FSCM be responsible for that? I could see if one or two injectors went bad I would need to replace some injectors but for this bad of a fuel dump problem, it seems like some kind of programming/message issue.

Did the CELstayed on after the bypass?

Its a returnless fuel system and with 12volts constant it will start to show very rich conditions. I actually just diagnosed and repaired a truck where they did the exact same thing. It will start dying and running poor.

How is this running? and does your engine have a fuel return line on it? I got an 08 and I'm told it doesn't have a fuel return line and therefore bypassing the module will result in too much fuel because of the lack of the return line.

Was the initial problem the injectors not working? Or the fuel pump?

Where did you buy your plug and play fscm before?

Variable fuel pressure for different throttle position loads-full pressure for idling,partial throttle...seems as if the milage will fall as will system longevity...

Theres a easier way to do this. If you have a tuner. You can change a setting from varriable to fixed speed. Yes by doing this will make the fuel b pump to 50% load. I was messing around to figurge a issue im dealing. Your the only that mentions anything close to dealing with.

First off how long did doing this last you because I have the exact problem and repaired everything that led me to this now if so can u please explain better how I am to do this on my 2011 silverado please

Hey Guys just FYI it has been running and driving fine for over a week now, no driveabilty problems at all! Do you think this fix will last?

Im currently going thru the same thing. Ive bypassed the fuel pump relay and the pump stays on constantly but it still wont start so i thought my injectors weren't working