bad fuel???

[Chris Hester]

how will bad fuel affect a 6.0 lt. chevy engine

[CamGTP]

I think that's a given don't you??

 

It would run bad, possible misfires, down on power or it may not even want to run at all if there was say a lot of water in the fuel.

[dsr611]

• Difficulty starting up
• Rough idling
• Pinging sounds
• Stalling
• Check engine light illumination
• Reduced fuel economy
• Higher emissions

[davester]

And depending on what year the vehicle is, there isn't much of a fuel filter in the system, so particles will wind up clogging the injectors.

 

The very early GMT800's (up to around '02/'03) had a return fuel system, with an inline fuel filter that did a good job of filtering, but later trucks use a really poor "filter" as part of the in-tank fuel pump.  After getting a bunch of crap in my fuel tank, and subsequently having to clean my fuel lines and injectors because of it, I put in the inline filter used in the earlier trucks, and haven't had a problem with it since (but also haven't had any extra crud in the fuel either).