LT/DI Swap quick question

[Blue Bee]

Can some one confirm for me that a 2017 Silverado 5.3 DI system, has a separate Fuel Pump Control Module? I know it does, but as in, is it a separate module from PCM/TCM when you gather info and requires extra license credit to tune it?

Thanks in advance.

[5FDP]

Yes, that is correct. You can choose to read or not read the FCPM, then license would cost more credits on top of the PCM/TCM credits.

[Blue Bee]

Yes, that is correct. You can choose to read or not read the FCPM, then license would cost more credits on top of the PCM/TCM credits.

Thanks man, that's what I figured. what I'm dealing with is a "complete" 2017 Silverado swap into a 1987 C10. But all I get is the PCM and TCM...the fuel module is there, I don't have any comm codes, but I'm having a major fuel pressure issue on the low side that is fine for a few minutes then pressure spikes to pressure relief (110 psi) then drops to 10-20...some times it will die. I didn't do the swap and the wiring is kind of a nightmare. It's getting on my nerves really, once again fixing others mistakes and piss poor work.

[modularfox]

what does their low side fuel system look like? I got my 87 Silverado / 2015 l83 on the road 2 weeks ago. I used a TI automotive F10000305 or 302 version. used since the stock pump and my adapter ring sat to high and required notching of the cab support. I drew up /designed my own adapter plate so I can run the new style flex fuel safe fuel line in tank so I can run the e85 to capitalize on the HP gains

i too am running the stock fuel pump control module





stock stuff would work fine connecting the pump to it, but the rubber that connects the 2 would have deteriorated due to e85... also wanted 3/8 for all ports and most importantly the correct connector fitting on top to handle the current. the little yellow one isnt capable of more than 14 amps.

[grandam75]

Thanks man, that's what I figured. what I'm dealing with is a "complete" 2017 Silverado swap into a 1987 C10. But all I get is the PCM and TCM...the fuel module is there, I don't have any comm codes, but I'm having a major fuel pressure issue on the low side that is fine for a few minutes then pressure spikes to pressure relief (110 psi) then drops to 10-20...some times it will die. I didn't do the swap and the wiring is kind of a nightmare. It's getting on my nerves really, once again fixing others mistakes and piss poor work.

I had a similar issue. Was pushing support for FPCM access to my 2016 L83. However, as it turns out, at least in my application the FPCM is just a slave controller and the ECM parameters are controlling the low fuel pressure so no need to access the FPCM.