Fuel Pump Control Module? Ground side circuit voltage drop

NorthTexTundraFan I did all that and everything else from this thread and others. I talked to my buddy who's a certified toyota mechanic today and he told me to just bypass the fpcm.

 

I’m starting to think that’s the only way. I replaced the module and it didn’t fix it. It sounds different when it cranks… makes me wonder if whatever controls this fuel pump control module is simply not telling it to pump fuel, and if my FPCM was never bad in the first place.

 

Does your buddy say whether or not there is any harm or loss of function / efficiency? I would hate to miss out on this amazing 14 mpg

 

he said it does affect fuel economy. He also said that all the times he's done it there have been no long term affects.

 

I am going through the same issue with my 2010 4.6L Double Cab...replaced the fuel pump(which was bad). Replaced the FPCM (which you can only buy as used or from the dealer, I couldn't even find one on Ebay) and now I am getting ECM not connected on my Launch X-431 scanner. Is there a way to easily check the ECM to see if that is the issue. I checked my OBDII pins and they all have drag. All of my fuses and relays are good and battery disconnected for days. When it does the scan it reports on AC, BCM, OD, ABS, TPMS, IMMO, SRS and CM. No ECM. I am taking from this that the CAN bus system is working. Am I missing something really simple or am I to the point where replacing the ECM makes sense?

 

So what is the conclusion/solution to this? I am having the same issue 2009 Tundra 5.7 V8 Flex Fuel. Replaced Fuel Pump Driver module and am still having issues. Is the only way to fix this by bypassing the FPDM?

 

I’m having similar issues with my 2015 Tundra. Had the fuel pump replaced twice and the fuel pump control module replaced twice. This last time it only ran for 30 miles before failing again. It seems like something on my truck is killing the fuel pump control modules. Does anybody know how I can bypass the fpcm on my 2015 4.6l Tundra? I have the single connector with six wires.

 

Another one here with a no start 2009 Tundra. Pulled the Module and it's quite deteriorated, mechanic assumed this was the immediate problem so I was able to get one from a donor truck, plugged it in and no luck. Apparently my module and the plug at the truck end are showing some signs of burned plastic inside the actual plugs. A friend who is a skilled mechanic said it might be the plugs themselves but I would need to get the truck towed to his garage to better diagnose. Reading that guys checked the fuses and relays, can someone give me direction as to where these are so I can help myself incase it's something simple ? Also this being a 2009 it has the older style module with the two plugs and not the single plug, which is unfortunate because it's a difficult part to find. Really appreciate some help before I go ordering parts that may not be the fix.