I have an 05 Chevy Malibu and I bought two of the gum out brand complete fuel system cleaners. It says on there to add on a nearly empty tank. However I rarely ever go anywhere, a full tank lasts me over a month. Can I add it to a 3/4 full gas tank without ruining anything?
Yes, no problem
It will simply be more diluted than the directions call for. No harm, but possibly less benefit. Speaking of benefit, what are you trying to accomplish?
Just regular maintenance to the car. Been a while since it had some. To be honest I saw it on sale for buy one get one so I just picked it up at the store lol. No particular reason.
It doesn’t matter.
You can add the Gumout when the tank is nearly empty and then fill the gas tank. or fill the gas tank and then add the gumout.
The instructions: Add entire bottle to nearly empty gasoline tank at time of oil change. Refill tank with 18 to 35 gallons of gasoline.
Did you change the plugs on this as one of your other threads asked about?
Yep. Changed plugs and boots today also.