Did we somehow loose the ability to change fuel tank size with the Gen V's?

The usual tables aren't there for fuel tank size, and fuel level sender percentage.

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Did you make sure to read the FPCM? Attachment 108853
That is how they read fuel level. Through the FPCM. Attachment 108854

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Originally Posted by TheMechanic

Did you make sure to read the FPCM? Attachment 108853
That is how they read fuel level. Through the FPCM. Attachment 108854

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I don?t have the FPCM hooked up on my swap yet I do have the fuel level sensor gauge wire hooked up to the correct pin on my ECM and it does read the level just fine, it?s just incorrect since it?s a different tank and sending unit.

Quote:

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Originally Posted by lVloses

I don?t have the FPCM hooked up on my swap yet I do have the fuel level sensor gauge wire hooked up to the correct pin on my ECM and it does read the level just fine, it?s just incorrect since it?s a different tank and sending unit.

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Sorry I don't know. From what I understand the fuel tank level is a sensor input to the FPCM and a CAN communicated data signal to the ECM/PCM. Can you give me a little more info on what you are working on? See if it is different in SI?

Quote:

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Originally Posted by TheMechanic

Sorry I don't know. From what I understand the fuel tank level is a sensor input to the FPCM and a CAN communicated data signal to the ECM/PCM. Can you give me a little more info on what you are working on? See if it is different in SI?

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The FPCM, at least mine from the donor car, only handles fuel pressure regulation. The ECM has a wire for fuel pump level signal X1 P25. And like I said it works and reads, it just reads incorrectly and as far as I know there?s no way to adjust it with HPTuners.

Nope, I sure didn't. I realized it when I saw your post and forgot to respond.

Slaps self in head for being dumb :P

Thanks