1688 vp44
 

ok guys i have read the forums that are sticky and done some other reseacher on pumps i have a 1688 code for about a week now no dead peadal truck cranks fine [i do have hot rod pump]just wondering if when get 1688 if pump just die or what?

What is your fuel pressure?

15 at wot

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15psi wot

So the truck runs and drives fine?

ya just check engine light came on so pulled codes and there it was 1688

1688 is lacking comm between pump and ECM. Your elctronics could have gone bad on the pump, the ECM could be going out.. could be a few things but most of the time it not the pump that went bad, its the electronics.

i read a write up on here last night about that they was soldering the wires back on